Results for "Guang-Can Guo"

total 7369took 0.20s
Ghost interference and diffraction based on the beam splitterJul 16 1997A simple scheme is proposed for observing the ghost interference and diffraction. The signal and the idler beams are produced by a beam splitter with the incident light being in a thermal state. A slit is inserted into the signal beam. We derive rigorously ... More
Disentanglement and Inseparability correlation : in two-qubit systemNov 14 1999Started from local universal isotropic disentanglement, a threshold inequality on reduction factors is proposed, which is necessary and sufficient for this type of disentanglement processes. Furthermore, we give the conditions realizing ideal disentanglement ... More
Pulse controlled noise suppressed quantum computationJul 26 1998To make arbitrarily accurate quantum computation possible, practical realization of quantum computers will require suppressing noise in quantum memory and gate operations to make it below a threshold value. A scheme based on realistic quantum computer ... More
Optimal quantum codes for preventing collective amplitude dampingApr 06 1998Collective decoherence is possible if the departure between quantum bits is smaller than the effective wave length of the noise field. Collectivity in the decoherence helps us to devise more efficient quantum codes. We present a class of optimal quantum ... More
Correlations in interference and diffractionJun 18 1997Quantum formalism of Fraunhofer diffraction is obtained. The state of the diffraction optical field is connected with the state of the incident optical field by a diffraction factor. Based on this formalism, correlations of the diffraction modes are calculated ... More
Reducing spatially correlated noise and decoherence with quantum error correcting codesNov 22 1998It is shown that the noise process in quantum computation can be described by spatially correlated decoherence and dissipation. We demonstrate that the conventional quantum error correcting codes correcting for single-qubit errors are applicable for reducing ... More
Quantum error avoiding codes versus quantum error correcting codesSep 19 1998A general theory of quantum error avoiding codes is established, and new light is shed on the relation between quantum error avoiding and correcting codes. Quantum error avoiding codes are found to be a special type of highly degenerate quantum error ... More
Probabilistic cloning and identification of linearly independent quantum statesApr 27 1998We construct a probabilistic quantum cloning machine by a general unitary-reduction operation. With a postselection of the measurement results, the machine yields faithful copies of the input states. It is shown that the states secretly chosen from a ... More
Perturbative expansions for the fidelities and spatially correlated dissipation of quantum bitsJun 10 1997Feb 02 1998We construct generally applicable short-time perturbative expansions for some fidelities, such as the input-output fidelity, the entanglement fidelity, and the average fidelity. Successive terms of these expansions yield characteristic times for the damping ... More
One-step preparation of cluster states in quantum dot moleculesNov 24 2006Apr 13 2007Cluster states, a special type of highly entangled states, are a universal resource for measurement-based quantum computation. Here, we propose an efficient one-step generation scheme for cluster states in semiconductor quantum dot molecules, where qubits ... More
Quantum Non-Demolition Bell State Measurement and N-party GHZ State Preparation in Quantum DotNov 28 2005Sep 27 2006By exploiting the fermionic qubit parity measurement, we present a scheme to realize quantum non-demolition (QND) measurement of Bell-states and generate n-party GHZ state in quantum dot. Compared with the original protocol, the required electron transfer ... More
Remote Preparation of Mixed States via Noisy EntanglementMar 09 2005We present a practical and general scheme of remote preparation for pure and mixed state, in which an auxiliary qubit and controlled-NOT gate are used. We discuss the remote state preparation (RSP) in two important types of decoherent channel (depolarizing ... More
Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fieldsNov 25 2012Feb 04 2013We study the phase diagram of a two-dimensional ultracold Fermi gas with the synthetic spin-orbit coupling (SOC) that has recently been realized at NIST. Due to the coexistence of anisotropic SOC and effective Zeeman fields in the NIST scheme, the system ... More
Local Operations in qubit arrays via global but periodic ManipulationOct 20 2006We provide a scheme for quantum computation in lattice systems via global but periodic manipulation, in which only effective periodic magnetic fields and global nearest neighbor interaction are required. All operations in our scheme are attainable in ... More
Qunatum Parrondo's games constructed by quantum random walkMar 27 2013We construct a Parrondo's game using discrete time quantum walks. Two lossing games are represented by two different coin operators. By mixing the two coin operators $U_{A}(\alpha_{A},\beta_{A},\gamma_{A})$ and $U_{B}(\alpha_{B},\beta_{B},\gamma_{B})$, ... More
Conquer the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stressesJun 06 2012Eliminating the fine structure splitting (FSS) of excitons in self-assembled quantum dots (QDs) is essential to the generation of high quality entangled photon pairs. It has been shown that the FSS has a lower bound under uniaxial stress. In this letter, ... More
Efficient Quantum RatchetJun 16 2012Quantum resonance is one of the main characteristics of the quantum kicked rotor, which has been used to induce accelerated ratchet current of the particles with a generalized asymmetry potential. Here we show that by desynchronizing the kicked potentials ... More
Conditions for manipulation of a set of entangled pure statesFeb 24 2000We derive a sufficient condition for a set of pure states, each entangled in two remote $N$-dimensional systems, to be transformable to $k$-dimensional-subspace equivalent entangled states ($k\leq N$) by same local operations and classical communication. ... More
General Strategies for Discrimination of Quantum StatesJul 31 1999We derive general discrimination of quantum states chosen from a certain set, given initial $M$ copies of each state, and obtain the matrix inequality, which describe the bound between the maximum probability of correctly determining and that of error. ... More
Quantum Clone and States Estimation for n-state SystemJul 31 1999Jun 14 2000We derive a lower bound for the optimal fidelity for deterministic cloning a set of n pure states. In connection with states estimation, we obtain a lower bound about average maximum correct states estimation probability.
Unconventional Fulde-Ferrell-Larkin-Ovchinnikov pairing states in a Fermi gas with spin-orbit couplingJul 11 2013We study the phase diagram in a two-dimensional Fermi gas with the synthetic spin-orbit coupling that has recently been realized experimentally. In particular, we characterize in detail the properties and the stability region of the unconventional Fulde-Ferrell-Larkin-Ovchinnikov ... More
Experimental observation of optical precursors in optically pumped crystalsApr 12 2013We experimentally observed optical precursors in optically pumped crystals using polarization-based interference. By switching the user-programmable medium among the fast light, slow light and no-dispersion regimes, we observed an unchanged polarization ... More
Quantum Discrete Cosine Transform for Image CompressionJan 08 2006Jan 22 2006Discrete Cosine Transform (DCT) is very important in image compression. Classical 1-D DCT and 2-D DCT has time complexity O(NlogN) and O(N²logN) respectively. This paper presents a quantum DCT iteration, and constructs a quantum 1-D and 2-D DCT algorithm ... More
Origin of ferroelectricity in high-$T_c$ magnetic ferroelectric CuONov 15 2011May 04 2012Cupric oxide is a unique magnetic ferroelectric material with a transition temperature significantly higher than the boiling point of liquid nitrogen. However, the mechanism of high-T$_c$ multiferroicity in CuO remains puzzling. In this paper, we clarify ... More
Heating and Cooling in Adiabatic Mixing processMay 28 2010Feb 18 2011We study the effect of interaction on the temperature change in the process of adiabatic mixing two components of fermi gases by the real-space Bogoliubov-de Gennes (BdG) method. We find that in the process of adiabatic mixing, the competition of the ... More
Exciton polarization, fine structure splitting and quantum dot asymmetry under uniaxial stressDec 13 2010May 03 2011We derive a general relation between the fine structure splitting (FSS) and the exciton polarization angle of self-assembled quantum dots (QDs) under uniaxial stress. We show that the FSS lower bound under external stress can be predicted by the exciton ... More
Efficient numerical method to calculate three-tangle of mixed statesDec 31 2009We demonstrate an efficient numerical method to calculate three-tangle of general mixed states. We construct a "energy function" (target function) for the three-tangle of the mixed state under certain constrains. The "energy function" (target function) ... More
Concatenating dynamical decoupling with decoherence-free subspaces for quantum computationNov 11 2003May 11 2004A scheme to implement a quantum computer subjected to decoherence and governed by an untunable qubit-qubit interaction is presented. By concatenating dynamical decoupling through bang-bang (BB) pulse with decoherence-free subspaces (DFSs) encoding, we ... More
Decoherence effects on the quantum spin channelsMar 25 2006Jun 11 2006An open ended spin chain can serves as a quantum data bus for the coherent transfer of quantum state information. In this paper, we investigate the efficiency of such quantum spin channels which work in a decoherence environment. Our results show that, ... More
Quantum key distribution via quantum encryptionNov 09 2000Jul 10 2001A quantum key distribution protocol based on quantum encryption is presented in this Brief Report. In this protocol, the previously shared Einstein-Podolsky-Rosen pairs act as the quantum key to encode and decode the classical cryptography key. The quantum ... More
Comment on "Quantum key distribution without alternative measurements"Sep 11 2000In a recent paper [A. Cabello, Phys. Rev. A 61, 052312 (2000)], a quantum key distribution protocol based on entanglement swapping was proposed. However, in this comment, it is shown that this protocol is insecure if Eve use a special strategy to attack. ... More
Quantum authentication using entangled stateAug 09 2000Aug 16 2000A scheme of quantum authentication is presented. Two parties share Einstein-Podolsky-Rosen (EPR) pairs previously as the authentication key which servers as encoder and decoder. The authentication is accomplished with local controlled-NOT operations and ... More
Quantum key distribution using different-frequency photonsJun 08 2000In this paper, we present a scheme for quantum key distribution, in which different-frequency photons are used to encode the key. Thses different-frequency photons are produced by an acoustic-optical modulator and two kinds of narrow filters . This scheme ... More
Bose-Einstein condensate in an optical lattice with Raman-assisted two-dimensional spin-orbit couplingDec 23 2015Aug 02 2016In a recent experiment by Wu {\textit et al.} (arXiv:1511.08170), a Raman-assisted two-dimensional spin-orbit coupling has been realized for a Bose-Einstein condensate in an optical lattice potential. In light of this exciting progress, we study in detail ... More
Average position in quantum walks with a U(2) coinOct 11 2012We investigated discrete-time quantum walks with an arbitary unitary coin. Here we discover that the average position $<x> =\max(<x> \sin(\alpha+\gamma)$, while the initial state is $1/\sqrt{2}(\mid0L>+i\mid0R>)$. We prove the result and get some symmetry ... More
Quantum random walk in periodic potential on a lineOct 11 2012Oct 15 2012We investigated the discrete-time quantum random walks on a line in periodic potential. The probability distribution with periodic potential is more complex compared to the normal quantum walks, and the standard deviation $\sigma$ has interesting behaviors ... More
Temperature Dependent Empirical Pseudopotential Theory For Self-Assembled Quantum DotsMar 13 2012We develop a temperature dependent empirical pseudopotential theory to study the electronic and optical properties of self-assembled quantum dots (QDs) at finite temperature. The theory takes the effects of both lattice expansion and lattice vibration ... More
Scaling Behavior and Variable Hopping Conductivity in the Quantum Hall Plateau TransitionMar 27 2007We have measured the temperature dependence of the longitudinal resistivity $% \rho_{xx}$ of a two-dimensional electron system in the regime of the quantum Hall plateau transition. We extracted the quantitative form of scaling function for $\rho_{xx}$ ... More
Transmission of doughnut light through a bull's eye structureApr 28 2009Nov 10 2009We experimentally investigate the extraordinary optical transmission of doughnut light through a bull's eye structure. Since the intensity is vanished in the center of the beam, almost all the energy reaches the circular corrugations (not on the hole), ... More
Dispersive Coupling Between the Superconducting Transmission Line Resonator and the Double Quantum DotsFeb 10 2008May 30 2008Realization of controllable interaction between distant qubits is one of the major problems in scalable solid state quantum computing. We study a superconducting transmission line resonator (TLR) as a tunable dispersive coupler for the double-dot molecules. ... More
Ultrafast Manipulation of a Double Quantum Dot via Lyapunov Control MethodJan 12 2014For a double quantum dot (DQD) system, here we propose alternative ultrafast manipulate approach: Lyapunov control method, to transfer the state from R to L on the picosecond scale, orders of magnitude faster and transfer probability higher than the previously ... More
Robust high-fidelity teleportation of an atomic state through the detection of cavity decayNov 08 2003We propose a scheme for quantum teleportation of an atomic state based on the detection of cavity decay. The internal state of an atom trapped in a cavity can be disembodiedly transferred to another atom trapped in a distant cavity by measuring interference ... More
Achieving quantum precision limit in adaptive qubit state tomographyMar 01 2015Feb 28 2016The precision limit in quantum state tomography is of great interest not only to practical applications but also to foundational studies. However, little is known about this subject in the multiparameter setting even theoretically due to the subtle information ... More
Error-compensation measurements on polarization qubitsMar 01 2015Systematic errors are inevitable in most measurements performed in real life because of imperfect measurement devices. Reducing systematic errors is crucial to ensuring the accuracy and reliability of measurement results. To this end, delicate error-compensation ... More
Remote Implementation of Quantum OperationsSep 08 2005Shared entanglement allows, under certain conditions, the remote implementation of quantum operations. We revise and extend recent theoretical results on the remote control of quantum systems as well as experimental results on the remote manipulation ... More
Coupling of light from an optical fiber taper into silver nanowiresJun 02 2009We report the coupling of photons from an optical fiber taper to surface plasmon modes of silver nanowires. The launch of propagating plasmons can be realized not only at ends of the nanowires, but also at the midsection. The degree of the coupling can ... More
Controlled-Not Quantum Logic Gate in Two Strongly Coupled Semiconductor Charge QubitsNov 09 2014Nov 19 2014A crucial requirement for scalable quantum-information processing is the realization of multiple-qubit quantum gates. Universal multiple-qubit gates can be implemented by a set of universal single qubit gates and any one kind of two-qubit gate, such as ... More
Gates controlled parallel-coupled double quantum dot on both single layer and bilayer grapheneApr 20 2011Apr 22 2011Here we report the fabrication and quantum transport measurements of gates controlled parallel-coupled double quantum dot on both bilayer and single layer graphene. It is shown that the interdot coupling strength of the parallel double dots can be effectively ... More
Quantum Bus of Metal Nanowire with Surface Plasmon PolaritonsApr 23 2009Apr 15 2010We develop an architecture for distributed quantum computation using quantum bus of plasmonic circuits and spin qubits in self-assembled quantum dots. Deterministic quantum gates between two distant spin qubits can be reached by using an adiabatic approach ... More
Polarization properties of subwavelength hole arrays consisting of rectangular holesApr 06 2007Jun 04 2008Influence of hole shape on extraordinary optical transmission was investigated using hole arrays consisting of rectangular holes with different aspect ratio. It was found that the transmission could be tuned continuously by rotating the hole array. Further ... More
Three-component Fulde-Ferrell superfluids in a two-dimensional Fermi gas with spin-orbit couplingApr 20 2015Aug 05 2015We investigate the pairing physics of a three-component spin-orbit coupled Fermi gas in two spatial dimensions. The three atomic hyperfine states of the system are coupled by the recently realized synthetic spin-orbit coupling (SOC), which mixes different ... More
Detection efficiency and noise in semi-device independent randomness extraction protocolFeb 05 2015In this paper, we analyze several critical issues in semi-device independent quantum information processing protocol. In practical experimental realization randomness generation in that scenario is possible only if the efficiency of the detectors used ... More
Nanocrystals in silicon photonic crystal standing-wave cavities as spin-photon phase gates for quantum information processingJun 01 2007Aug 13 2007By virtue of a silicon high-Q photonic crystal nanocavity, we propose and examine theoretically interactions between a stationary electron spin qubit of a semiconductor nanocrystal and a flying photon qubit. Firstly, we introduce, derive and demonstrate ... More
Single-Photon-Level Quantum Image Memory Based on Cold Atomic EnsemblesMay 13 2013Jun 20 2013An important step towards the successful development of network that allows the distribution of quantum information is the storage of light in a matter at the single-photon level. Encoding photons in high-dimensional photonic states can significantly ... More
Quantum phase transition of Bose-Einstein condensates on a ring nonlinear latticeMay 05 2012We study the phase transitions in a one dimensional Bose-Einstein condensate on a ring whose atomic scattering length is modulated periodically along the ring. By using a modified Bogoliubov method to treat such a nonlinear lattice in the mean field approximation, ... More
Quantum simulation of Heisenberg spin chains with next nearest neighbor interactions in coupled cavitiesDec 21 2012We propose a scheme to simulate one-dimensional XXZ-type Heisenberg spin models with competing interactions between nearest-neighbors (NNs) and next-NNs in photon-coupled micro-cavities. Our scheme, for the first time, exploits the rich resources and ... More
Quantum Decoherence Modulated by Special RelativityMar 24 2007Oct 03 2007By investigating the evolution of a moving spin-1/2 Dirac electron coupled with a background magnetic noise, we demonstrate that the effects of special relativity will significantly modify the decoherence properties of the spin state. The dephasing could ... More
Quantum correlation and classical correlation dynamics in the spin-boson modelJul 05 2010We study the quantum correlation and classical correlation dynamics in a spin-boson model. For two different forms of spectral density, we obtain analytical results and show that the evolutions of both correlations depend closely on the form of the initial ... More
Brillouin scattering induced transparency and non-reciprocal light storageAug 12 2014Stimulated Brillouin scattering (SBS) is a very fundamental interaction between light and travelling acoustic waves, which is mainly attributed to the electrostriction and photoelastic effects with the interaction strength being orders of magnitude larger ... More
Mechanical bound state in the continuum for optomechanical microresonatorsJan 13 2016Clamping loss limits the quality factor of mechanical mode in the optomechanical resonators supported with the supporting stem. Using the mechanical bound state in the continuum, we have found that the mechanical clamping loss can be avoided. The mechanical ... More
Dynamic phase transitions of a driven Ising chain in a dissipative cavitySep 08 2016We study the nonequilibrium quantum phase transition of an Ising chain in a dissipative cavity driven by an external transverse light field. When driving and dissipation are in balance, the system can reach a nonequilibrium steady state which undergoes ... More
Optimal entanglement witnesses based on local orthogonal observablesMay 13 2007Aug 02 2007We show that the entanglement witnesses based on local orthogonal observables which are introduced in [S. Yu and N.-L. Liu, Phys. Rev. Lett. 95, 150504 (2005)] and [O. G\"uhne, M. Mechler, G. T\'oth and P. Adam, Phys. Rev. A 74, 010301 (2006)] in linear ... More
Reducing the communication complexity with quantum entanglementDec 13 2000We propose a probabilistic two-party communication complexity scenario with a prior nonmaximally entangled state, which results in less communication than that is required with only classical random correlations. A simple all-optical implementation of ... More
Optical Realization of Quantum Gambling MachineJan 06 2000Quantum gambling --- a secure remote two-party protocol which has no classical counterpart --- is demonstrated through optical approach. A photon is prepared by Alice in a superposition state of two potential paths. Then one path leads to Bob and is split ... More
BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit couplingApr 01 2014Jun 12 2014In this work, we study the BCS-BEC crossover and quantum phase transition in a Fermi gas under Rashba spin-orbit coupling close to a Feshbach resonance. By adopting a two-channel model, we take into account of the closed channel molecules, and show that ... More
Actively switchable non-degenerate polarization entangled photon pair distribution in a dense wave-division multiplexingJan 22 2013We have realized experimentally a non-degenerate polarization-entangled photon pair distribution in a commercial telecom dense wave-division multiplexing device (DWDM) with 8 channels. A promising point of this work is that the entangled photon pair is ... More
Approach to accurately measuring the speed of optical precursorsFeb 24 2011Oct 04 2011Precursors can serve as a bound on the speed of information with dispersive medium. We propose a method to identify the speed of optical precursors using polarization-based interference in a solid-state device, which can bound the accuracy of the precursors' ... More
Integrated photonic qubit quantum computing on a superconducting chipSep 29 2009Sep 30 2009We study a quantum computing system using microwave photons in transmission line resonators on a superconducting chip as qubits. We show that all control necessary for quantum computing can be implemented by coupling to Josephson devices on the same chip, ... More
Security proof of differential phase shift quantum key distribution in the noiseless caseJun 12 2008Oct 28 2008Differential phase shift quantum key distribution systems have a high potential for achieving high speed key generation. However, its unconditional security proof is still missing, even though it has been proposed for many years. Here, we prove its security ... More
Physical accessible transformations on a finite number of quantum statesNov 09 2006We consider to treat the usual probabilistic cloning, state separation, unambiguous state discrimination, \emph{etc} in a uniform framework. All these transformations can be regarded as special examples of generalized completely positive trace non-increasing ... More
Experimental violation of the Leggett-Garg inequality under decoherenceJul 01 2009Apr 23 2012Despite the great success of quantum mechanics, questions regarding its application still exist and the boundary between quantum and classical mechanics remains unclear. Based on the philosophical assumptions of macrorealism and noninvasive measurability, ... More
Frequency-up conversion and quantum swap gate in an optical cavity with atomic cloudJan 05 2008A scheme is presented for realizing frequency-up conversion and a two-qubit quantum swap gate for intracavity fields. In the scheme, a V-type atomic ensemble prepared in their ground states collectively mediates the interaction between the two cavity ... More
Phonon induced spin squeezing based on geometric phaseFeb 16 2015A scheme to achieve spin squeezing using a geometric phase induced by a single mechanical mode is proposed. The analytical and numerical results show that the ultimate degree of spin squeezing depends on the parameter $\frac{n_{th}+1/2}{Q\sqrt{N}}$, which ... More
Entangling power of two-qubit gates on mixed statesNov 22 2013The ability to reach a maximally entangled state from a separable one through the use of a two-qubit unitary operator is analyzed for mixed states. This extension from the known case of pure states shows that there are at least two families of gates which ... More
Super-resolution quantum sensing using NV centers based on rotating linear polarized light and Monte-Carlo methodNov 29 2016The nitrogen vacancy (NV) center in diamond has been widely applied for quantum information and sensing in last decade. Based on the laser polarization dependent excitation of fluorescence emission, we propose a super-resolution microscopy of NV center. ... More
Is a rubidium cell with long decay time always useful for generating a non-classical photon pair?Dec 19 2008We experimentally find an interesting and unexpected thing: a rubidium cell with long decay time can not be used to generate a non-classical correlated photon pair via the D2 transition of $^{87}$Rb using four-wave mixing configuration [Opt. Express {\bf ... More
Entanglement of the orbital angular momentum states of the photons generated in a hot atomic ensembleJul 01 2008Quantum protocols will be more efficient with high-dimensional entangled states. Photons carrying orbital angular momenta can be used to create a high-dimensional entangled state. In this paper we experimentally demonstrate the entanglement of the orbital ... More
Active Quantum Memory Using Oscillating Dark StatesJan 13 2008Jan 25 2008An active method for long time storage of quantum superposition state in atomic system using the Oscillating Dark States (ODS) is presented. Quantum state of a three-level $\Lambda$ configuration atomic system oscillates periodically between two ground ... More
Computational Complexity of Continuous Variable Quantum Key DistributionFeb 01 2006Jun 03 2008The continuous variable quantum key distribution has been considered to have the potential to provide high secret key rate. However, in present experimental demonstrations, the secret key can be distilled only under very small loss rates. Here, by calculating ... More
Broadband plasmonic absorber for photonic integrated circuitsNov 26 2013The loss of surface plasmon polaritons has long been considered as a fatal shortcoming in information transport. Here we propose a plasmonic absorber utilizing this "shortcoming" to absorb the stray light in photonic integrated circuits (PICs). Based ... More
The in-plane gradient magnetic field induced vortex lattices in spin-orbit coupled Bose-Einstein condensationsNov 27 2014We consider the ground-state properties of the two-component spin-orbit coupled ultracold bosons subject to a rotationally symmetric in-plane gradient magnetic field. In the non-interacting case, the ground state supports giant-vortices carrying large ... More
Dynamical Spin Squeezing via Higher Order Trotter-Suzuki ApproximationJun 16 2014Jul 16 2014Here we provide a scheme of transforming the one-axis twisting Hamiltonian into the two-axis twisting one based on high order Trotter-Suzuki Approximation. Compared with the paper [Y. C. Liu et al., Phys. Rev. Lett. 107, 013601 (2011)], our method can ... More
Compatibility conditions from multipartite entanglement measuresNov 22 2006Jun 04 2007We consider an arbitrary d_{1}\otimes d_{2}\otimes ... \otimes d_{N} composite quantum system and find necessary conditions for general m-party subsystem states to be the reduced states of a common N-party state. These conditions will lead to various ... More
Local Distinguishability and Schmidt Number of Orthogonal StatesOct 26 2005Oct 27 2005Now, the known ensembles of orthogonal states which are distinguishable by local operators and classical communication (LOCC) satisfy the condition that the sum of Schmidit numbers of the orthogonal states is not bigger than the dimensions of the whole ... More
A general framework of nondistortion quantum interrogationMar 22 2002Oct 28 2002We present a general framework to study nondistortion quantum interrogation which preserves the internal state of the quantum object being detected. We obtain the necessary and sufficient condition for successful performing nondistortion interrogation ... More
Proposed solid-state Faraday anomalous-dispersion optical filterAug 30 2011Nov 15 2011We propose a Faraday anomalous dispersion optical filter (FADOF) based on a rare-earth ion doped crystal. We present theoretical analyses for the solid-state FADOF transmission. Our theoretical model predicts a maximum transmission efficiency of 71% and ... More
Quantum computation with un-tunable couplingsSep 25 2002Most quantum computer realizations require the ability to apply local fields and tune the couplings between qubits, in order to realize single bit and two bit gates which are necessary for universal quantum computation. We present a scheme to remove the ... More
High efficiency Nondistortion Quantum Interrogation of atoms in quantum superpositionsMay 07 2001We consider the nondistortion quantum interrogation (NQI) of an atom prepared in a quantum superposition. By manipulating the polarization of the probe photon and making connections to interaction free measurements of opaque objects, we show that nondistortion ... More
Incoherent control of electromagnetically induced transparency and Aulter-Townes splittingOct 20 2014The absorption and dispersion of probe light is studied in an unified framework of three-level system, with coherent laser driving and incoherent pumping and relaxation. The electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) ... More
Generation of non-classical correlated photon pairs via a ladder-type atomic configuration: theory and experimentMay 02 2012We experimentally generate a non-classical correlated two-color photon pair at 780 and 1529.4 nm in a ladder-type configuration using a hot 85Rb atomic vapor with the production rate of ~107/s. The non-classical correlation between these two photons is ... More
Disembodiment of Physical Properties by Pre- and Post-SelectionsMar 20 2012The detailed study of disembodiment of physical properties by pre- and post-selection is present. A criterion is given to disembody physical properties for single particle with multiple degrees of freedom. It is shown that the non-commute operators can ... More
Simple scheme for expanding a polarization-entangled W state by adding one photonOct 15 2008We propose a simple scheme for expanding a polarization-entangled W state. By mixing a single photon and one of the photons in an n-photon W state at a polarization-dependent beam splitter (PDBS), we can obtain an (n+1)-photon W state after post-selection. ... More
Linear Up-conversion of Orbital angular momentumMar 09 2012Jul 11 2012We experimentally demonstrated that infrared light imprinted with orbital angular momentum (OAM) was linearly converted into visible light using four-wave mixing (FWM) via a ladder-type configuration in 85Rb atoms. Simultaneously, we theoretically simulated ... More
Room-temperature steady-state optomechanics entanglement on a chipDec 30 2010A potential experimental system, based on the Silicon Nitride (SiN) material, is proposed to generate steady-state room-temperature optomechanical entanglement. In the proposed structure, the nanostring interacts dispersively and reactively with the microdisk ... More
Exact scaling of geometric phase and fidelity susceptibility and their breakdown across the critical pointsNov 23 2016It was shown via numerical simulations that geometric phase (GP) and fidelity susceptibility (FS) in some quantum models exhibit universal scaling laws across phase transition points. Here we propose a singular function expansion method to determine their ... More
Hidden correlations of exciton complexes in self-assembled quantum dots and ringsDec 08 2008The binding energies of trions ($X^+$, $X^-$) and biexciton (XX) in self-assembled semiconductor quantum dots (QDs) are very sensitive to the geometry and chemical composition of the QDs, and are random from dots to dots. However, in this letter, we show ... More
Giant optical anisotropy in cylindrical self-assembled InAs/GaAs quantum ringsMay 14 2008Using a single-particle atomistic pseudopotential method followed by a many-particle configuration interaction method, we investigate the geometry, electronic structure and optical transitions of a self-assembled InAs/GaAs quantum ring (QR), changing ... More
Topological indexes in symmetry preserving dynamicsFeb 08 2018The quench dynamics of topological phases have received intensive investigations in recent years. In this work, we prove exactly that the topological invariants for both $\mathbb{Z}$ and $\mathbb{Z}_2$ indexes are independent of time in symmetry preserving ... More
Detuning Enhanced Cavity Spin SqueezingJul 28 2014The unconditionally squeezing of the collective spin of an atomic ensemble in a laser driven optical cavity (I. D. Leroux, M. H. Schleier-Smith, and V. Vuletic, Phys. Rev. Lett 104, 073602 (2010)) is studied and analyzed theoretically. Surprisingly, we ... More
Storage and retrieval of a light in telecomband in a cold atomic ensembleOct 15 2012A telecom photon is a suitable information carrier in a fiber-based quantum network due to its lower transmission loss in fiber. Because of the paucity of suitable atomic system, usually the photon connecting different memories is in near infrared band, ... More