Results for "Kavan Modi"

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A theoretical analysis of experimental open quantum dynamicsMar 16 2009In recent years there has been a significant development of the dynamical map formalism for initially correlated states of a system and its environment. Based on some of these results, we study quantum process tomography for initially correlated states ... More
Operational approach to open dynamics and quantifying initial correlationsNov 29 2010Aug 08 2012A central aim of physics is to describe the dynamics of physical systems. Schrodinger's equation does this for isolated quantum systems. Describing the time evolution of a quantum system that interacts with its environment, in its most general form, has ... More
Energetic fluctuations in an open quantum processJul 17 2014Relations similar to work and exchange fluctuations have been recently derived for open systems dynamically evolving in the presence of an ancilla. Extending these relations and constructing a non-equilibrium Helmholtz equation we derive a general expression ... More
Quantum Zeno and anti-Zeno effects in an Unstable System with Two Bound StateFeb 13 2005Sep 12 2007We analyze the experimental observations reported by Fischer et. al. [in Phys. Rev. Lett. 87, 040402 (2001)] by considering a system of coupled unstable bound quantum states A and B. The state B is coupled to a set of continuum states C. We investigate ... More
Criteria for measures of quantum correlationsAug 18 2011Jul 12 2012Entanglement does not describe all quantum correlations and several authors have shown the need to go beyond entanglement when dealing with mixed states. Various different measures have sprung up in the literature, for a variety of reasons, to describe ... More
Entropy bounds for quantum processes with initial correlationsMay 23 2014Dec 03 2015Quantum technology is progressing towards fast quantum control over systems interacting with small environments. Hence such technologies are operating in a regime where the environment remembers the system's past, and the applicability of complete-positive ... More
Coherent and incoherent contents of correlationsFeb 04 2009Aug 08 2012We examine bipartite and multipartite correlations within the construct of unitary orbits. We show that the set of product states is a very small subset of set of all possible states, while all unitary orbits contain classically correlated states. Using ... More
Unification of quantum and classical correlations and quantumness measuresApr 08 2011We give a pedagogical introduction to quantum discord. We the discuss the problem of separation of total correlations in a given quantum state into entanglement, dissonance, and classical correlations using the concept of relative entropy as a distance ... More
Spookyfying Quantum Information is ImpossibleAug 04 2016Classical information encoded in composite quantum states can be completely hidden from the reduced subsystems and may be found only in the correlations. Can the same be true for quantum information? If quantum information is hidden from subsystems and ... More
Preparation of states in open quantum mechanicsMar 11 2009Dec 08 2010We study preparation of states for open quantum mechanics. For non-Markovian systems that are initially correlated with the environment, the affects of the preparation procedure are nontrivial. This is due to the indirect affects on the state of the environment ... More
Fragile states are better for quantum metrologyAug 04 2016In quantum metrology, quantum probe states are capable of estimating unknown physical parameters to precisions beyond classical limits. What qualities do such states possess? Here we relate the performance of a probe state at estimating a parameter $\phi$ ... More
The relation between nonlocality and contextuality for a biphotonJul 09 2012Feb 26 2013We investigate the set of qutrit states in terms of symmetric states of two qubits that violate the minimal contextual inequality, namely the Klyachko-Can-Binicoglu-Shumovsky (KCBS) inequality. The physical system that provides a natural framework for ... More
Equilibration on average of temporally non-local observables in quantum systemsMay 21 2019Temporally non-local observables can evade equilibration on average in quantum systems. Equilibration on average refers to the evolution of a system's time-dependent properties towards a constant value and remaining close to it for most times. We generalize ... More
A pedagogical overview of quantum discordDec 30 2013Recent measures of nonclassical correlations are motivated by different notions of classicality and operational means. Quantum discord has received a great deal of attention in studies involving quantum computation, metrology, dynamics, many-body physics, ... More
Quantum Computing with black-box SubroutinesOct 10 2013Nov 21 2013Modern programming relies on our ability to treat preprogrammed functions as black boxes - we can invoke them as subroutines without knowing their physical implementation. Here we show it is generally impossible to execute an unknown quantum subroutine. ... More
Completely Positive Maps and Classical CorrelationsMar 02 2007Oct 29 2009We expand the set of initial states of a system and its environment that are known to guarantee completely positive reduced dynamics for the system when the combined state evolves unitarily. We characterize the correlations in the initial state in terms ... More
Quantum Markov OrderMay 29 2018Nov 10 2018We formally extend the notion of Markov order to open quantum processes by accounting for the instruments used to probe the system of interest at different times. Our description recovers the classical Markov order property in the appropriate limit: when ... More
The power of one qumode for quantum computationOct 16 2015May 03 2016Although quantum computers are capable of solving problems like factoring exponentially faster than the best-known classical algorithms, determining the resources responsible for their computational power remains unclear. An important class of problems ... More
Correlations, operations and the second law of thermodynamicsNov 28 2014Completely positive trace preserving maps are essential for the formulation of the second law of thermodynamics. The dynamics of quantum systems, correlated with their environments, are in general not described by such maps. We explore how this issue ... More
Enhancing the charging power of quantum batteriesDec 15 2016Apr 19 2017Can collective quantum effects make a difference in a meaningful thermodynamic operation? Focusing on energy storage and batteries, we demonstrate that quantum mechanics can lead to an enhancement in the amount of work deposited per unit time, i.e., the ... More
Tomographically reconstructed master equations for any open quantum dynamicsApr 20 2017Jul 06 2018Memory effects in open quantum dynamics are often incorporated in the equation of motion through a superoperator known as the memory kernel, which encodes how past states affect future dynamics. However, the usual prescription for determining the memory ... More
A non-equilibrium quantum Landauer principleFeb 18 2014Jan 09 2015Using the operational framework of completely positive, trace preserving operations and thermodynamic fluctuation relations, we derive a lower bound for the heat exchange in a Landauer erasure process on a quantum system. Our bound comes from a non-phenomenological ... More
Reconstructing open quantum system dynamics with limited controlOct 07 2016Jul 06 2018The dynamics of an open quantum system can be fully described and tomographically reconstructed if the experimenter has complete control over the system of interest. Most real-world experiments do not fulfill this assumption, and the amount of control ... More
Tight, robust, and feasible quantum speed limits for open dynamicsJun 22 2018Feb 22 2019Starting from a geometric perspective, we derive a quantum speed limit for arbitrary open quantum evolution, which could be Markovian or non-Markovian, providing a fundamental bound on the time taken for the most general quantum dynamics. Our methods ... More
Power of One Bit of Quantum Information in Quantum MetrologyApr 09 2015Apr 10 2015We construct a model of quantum metrology inspired by the computational model known as deterministic quantum computation with one quantum bit (DQC1). Using only one pure qubit together with $l$ fully-mixed qubits we obtain measurement precision at the ... More
Reconstructing open quantum system dynamics with limited controlOct 07 2016The dynamics of an open quantum system can be fully described and tomographically reconstructed if the experimenter has complete control over the system of interest. Most real-world experiments do not fulfill this assumption, and the amount of control ... More
Emergence of a fluctuation relation for heat in typical open quantum processesOct 28 2015In a generalisation of the Landauer erasure protocol, we study bounds on the heat generated in typical open quantum processes. We derive a fluctuation relation for this heat, implying that it is almost always positive when either the system or reservoir ... More
The role of preparation in quantum process tomographyApr 29 2009In a recent letter one of us pointed out how differences in preparation procedures for quantum experiments can lead to non-trivial differences in the results of the experiment. The difference arise from the initial correlations between the system and ... More
Measuring the heat exchange of a quantum processJan 16 2014Aug 19 2014Very recently, interferometric methods have been proposed to measure the full statistics of work performed on a driven quantum system [Dorner et al. Phys. Rev. Lett. 110 230601 (2013)] and [Mazzola et al. Phys. Rev. Lett. 110 230602 (2013)]. The advantage ... More
Non-Markovian memory in IBMQX4Feb 21 2019We measure and quantify non-Markovian effects in IBM's Quantum Experience. Specifically, we analyze the temporal correlations in a sequence of gates by characterizing the performance of a gate conditioned on the gate that preceded it. With this method, ... More
An introduction to operational quantum dynamicsAug 02 2017In the summer of 2016, physicists gathered in Torun, Poland for the 48th annual Symposium on Mathematical Physics. This Symposium was special; it celebrated the 40th anniversary of the discovery of the Gorini-Kossakowski-Sudarshan-Lindblad master equation, ... More
Using a biased qubit to probe complex systemsJul 17 2015Sep 15 2016Complex mesoscopic systems play increasingly important roles in modern science -- from understanding biological functions at the molecular level, to designing solid-state information processing devices. The operation of these systems typically depends ... More
Measuring quantumness via anticommutatorsJan 05 2012May 27 2013We introduce a method to witness the quantumness of a system. The method relies on the fact that the anticommutator of two classical states is always positive. We show that there is always a nonpositive anticommutator due to any two quantum states. We ... More
Unified View of Quantum and Classical CorrelationsNov 29 2009Mar 03 2010We discuss the problem of the separation of total correlations in a given quantum state into entanglement, dissonance, and classical correlations using the concept of relative entropy as a distance measure of correlations. This allows us to put all correlations ... More
Role of correlations in the two-body-marginal problemOct 03 2013Oct 14 2014Quantum properties of correlations have a key role in disparate fields of physics, from quantum information processing, to quantum foundations, to strongly correlated systems. We tackle a specific aspect of the fundamental quantum marginal problem: we ... More
Dynamical role of system-environment correlations in non-Markovian dynamicsMar 16 2012Jul 31 2012We analyse the role played by system-environment correlations in the emergence of non-Markovian dynamics. By working within the framework developed in Breuer et al., Phys. Rev. Lett. 103, 210401 (2009), we unveil a fundamental connection between non-Markovian ... More
Almost Markovian processes from closed dynamicsFeb 28 2018Jan 29 2019It is common, when dealing with quantum processes involving a subsystem of a much larger composite closed system, to treat them as effectively memory-less (Markovian). While open systems theory tells us that non-Markovian processes should be the norm, ... More
Non-Markovian quantum control as coherent stochastic trajectoriesFeb 09 2018Sep 19 2018We develop a notion of stochastic quantum trajectories. First, we construct a basis set of trajectories, called elementary trajectories, and go on to show that any quantum dynamical process, including those that are non-Markovian, can be expressed as ... More
Quantum thermodynamics of general quantum processesJun 11 2014Mar 27 2015Accurately describing work extraction from a quantum system is a central objective for the extension of thermodynamics to individual quantum systems. The concepts of work and heat are surprisingly subtle when generalizations are made to arbitrary quantum ... More
The classical-quantum boundary for correlations: discord and related measuresDec 29 2011Nov 27 2012One of the best signatures of nonclassicality in a quantum system is the existence of correlations that have no classical counterpart. Different methods for quantifying the quantum and classical parts of correlations are amongst the more actively-studied ... More
The Structure of Quantum Stochastic Processes with Finite Markov OrderOct 25 2018Nov 10 2018Non-Markovian quantum processes exhibit different memory effects when measured in different ways; an unambiguous characterization of memory length requires accounting for the sequence of instruments applied to probe the system dynamics. This instrument-specific ... More
Positivity in the presence of initial system-environment correlationMar 23 2012Dec 15 2012The constraints imposed by the initial system-environment correlation can lead to nonpositive Dynamical maps. We find the conditions for positivity and complete positivity of such dynamical maps by using the concept of an assignment map. Any initial system-environment ... More
Kolmogorov extension theorem for general (quantum) stochastic processesDec 07 2017In classical physics, the Kolmogorov extension theorem provides the foundation for the definition and investigation of stochastic processes. In its original form, it does not hold in quantum mechanics. More generally, it does not hold in any theory -- ... More
Non-Markovian quantum control as coherent stochastic trajectoriesFeb 09 2018Feb 12 2018We develop a notion of stochastic quantum trajectories. First, we construct a basis set of trajectories, called elementary trajectories, and go on to show that any quantum dynamical process, including those that are non-Markovian, can be expressed as ... More
Tightening Quantum Speed Limits for Almost All StatesSep 26 2017Oct 10 2017Conventional quantum speed limits perform poorly for mixed quantum states: They are generally not tight and often significantly underestimate the fastest possible evolution speed. To remedy this, for unitary driving, we derive two quantum speed limits ... More
The Structure of Quantum Stochastic Processes with Finite Markov OrderOct 25 2018Apr 10 2019Non-Markovian quantum processes exhibit different memory effects when measured in different ways; an unambiguous characterization of memory length requires accounting for the sequence of instruments applied to probe the system dynamics. This instrument-specific ... More
How does interference fall?Oct 07 2016We study how single- and double-slit interference patterns fall in the presence of gravity. First, we demonstrate that universality of free fall still holds in this case, i.e., interference patterns fall just like classical objects. Next, we explore lowest ... More
Quantum Correlations in Mixed-State MetrologyMar 05 2010Dec 30 2011We analyze the effects of quantum correlations, such as entanglement and discord, on the efficiency of phase estimation by studying four quantum circuits that can be readily implemented using NMR techniques. These circuits define a standard strategy of ... More
Linear Assignment Maps for Correlated System-Environment StatesOct 29 2009Dec 18 2009An assignment map is a mathematical operator that describes initial system-environment states for open quantum systems. We reexamine the notion of assignments, introduced by Pechukas, and show the conditions assignments can account for correlations between ... More
Supersensitive measurement using single-atom control of an atomic ensembleNov 09 2015We analyze the operation of a novel sensor based on atom interferometry, which can achieve supra-classical sensitivity by exploiting quantum correlations in mixed states of many qubits. The interferometer is based on quantum gates which use coherently-controlled ... More
Almost Markovian processes from closed dynamicsFeb 28 2018Apr 24 2019It is common, when dealing with quantum processes involving a subsystem of a much larger composite closed system, to treat them as effectively memory-less (Markovian). While open systems theory tells us that non-Markovian processes should be the norm, ... More
Kolmogorov extension theorem for (quantum) causal modelling and general probabilistic theoriesDec 07 2017Jul 07 2018In classical physics, the Kolmogorov extension theorem lays the foundation for the theory of stochastic processes. It has been known for a long time that, in its original form, this theorem does not hold in quantum mechanics. More generally, it does not ... More
Quantacell: Powerful charging of quantum batteriesMar 24 2015Jul 27 2015We study the problem of charging a quantum battery in finite time. We demonstrate an analytical optimal protocol for the case of a single qubit. Extending this analysis to an array of N qubits, we demonstrate that an N-fold advantage in power per qubit ... More
Classical to quantum in large number limitDec 26 2011Mar 28 2012We construct a quantumness witness following the work of Alicki and van Ryn (AvR) in "A simple test of quantumness for a single system" [J. Phys. A: Math. Theor., vol. 41, 062001 (2008)]. The AvR test is designed to detect quantumness. We reformulate ... More
Detecting Multipartite Classical States and their ResemblancesMay 24 2010Sep 24 2010We study various types of multipartite states lying near the quantum-classical boundary. The class of so-called classical states are precisely those in which each party can perform a projective measurement to identify a locally held state without disturbing ... More
Almost Markovian processes from closed dynamicsFeb 28 2018Apr 29 2019It is common, when dealing with quantum processes involving a subsystem of a much larger composite closed system, to treat them as effectively memory-less (Markovian). While open systems theory tells us that non-Markovian processes should be the norm, ... More
CP divisibility does not mean MarkovianityJan 16 2019In the classical domain, it is well-known that divisibility does not imply that a stochastic process is Markovian. However, for quantum processes, divisibility is often considered to be synonymous with Markovianity. We show that completely positive (CP) ... More
A Simple Test of the Equivalence Principle(s) for Quantum SuperpositionsNov 10 2015We propose a simple experimental test of the quantum equivalence principle introduced by Zych and Brukner [arXiv:1502.00971], which generalises the Einstein equivalence principle to superpositions of internal energy states. We consider a harmonically-trapped ... More
Non-Markovian quantum processes: complete framework and efficient characterisationDec 02 2015Jan 31 2018Currently, there is no systematic way to describe a quantum process with memory solely in terms of experimentally accessible quantities. However, recent technological advances mean we have control over systems at scales where memory effects are non-negligible. ... More
A fast algorithm for identifying Friends-of-Friends halosJul 12 2016We describe a simple and fast algorithm for identifying friends-of-friends clusters and prove its correctness. The algorithm avoids unnecessary expensive neighbor queries, uses minimal memory overhead, and rejects slowdown in high over-density regions. ... More
Divisible quantum dynamics satisfies temporal Tsirelson's boundOct 15 2015We show that divisibility of qubit quantum processes implies temporal Tsirelson's bound. We also prove that the classical bound of the temporal Bell's inequality holds for dynamics that can be described by entanglement-breaking channels---a more general ... More
Complete framework for efficient characterisation of non-Markovian processesDec 02 2015Oct 18 2016A non-Markovian process is one that retains 'memory' of its past. A systematic understanding of these processes is necessary to fully describe and harness a vast range of complex phenomena; however, no such general characterisation currently exists. This ... More
Characterizing quantum dynamics with initial system-environment correlationsOct 21 2014We fully characterize the reduced dynamics of an open quantum system initially correlated with its environment. Using a photonic qubit coupled to a simulated environment we tomographically reconstruct a superchannel---a generalised channel that treats ... More
Quantum thermodynamics for a model of an expanding universeSep 18 2014Jan 12 2016We investigate the thermodynamical properties of quantum fields in curved spacetime. Our approach is to consider quantum fields in curved spacetime as a quantum system undergoing an out-of-equilibrium transformation. The non-equilibrium features are studied ... More
Noisy frequency estimation with noisy probesDec 21 2017Aug 18 2018We consider frequency estimation in a noisy environment with noisy probes. This builds on previous studies, most of which assume that the initial probe state is pure, while the encoding process is noisy, or that the initial probe state is mixed, while ... More
Operational Markov condition for quantum processesJan 30 2018We derive a necessary and sufficient condition for a quantum process to be Markovian which coincides with the classical one in the relevant limit. Our condition unifies all previously known definitions for quantum Markov processes by accounting for all ... More
Vanishing quantum discord is not necessary for completely-positive mapsDec 18 2012Apr 04 2013The description of the dynamics of a system that may be correlated with its environment is only meaningful within the context of a specific framework. Different frameworks rely upon different assumptions about the initial system-environment state. We ... More
Energy-efficient quantum frequency estimationDec 21 2017Jun 13 2018The problem of estimating the frequency of a two-level atom in a noisy environment is studied. Our interest is to minimise both the energetic cost of the protocol and the statistical uncertainty of the estimate. In particular, we prepare a probe in a ... More
Spin-chain model of a many-body quantum batteryDec 10 2017Recently, it has been shown that energy can be deposited on a collection of quantum systems at a rate that scales super-extensively. Some of these schemes for `quantum batteries' rely on the use of global many-body interactions that take the batteries ... More
Entanglement, non-Markovianity, and causal non-separabilityNov 11 2017Quantum mechanics, in principle, allows for processes with indefinite causal order. However, most of these causal anomalies have not yet been detected experimentally. We show that every such process can be simulated experimentally by means of non-Markovian ... More
Unification of witnessing initial system-environment correlations and witnessing non-MarkovianityApr 10 2012We show the connection between a witness that detects dynamical maps with initial system-environment correlations and a witness that detects non-Markovian open quantum systems. Our analysis is based on studying the role that state preparation plays in ... More
How state preparation can affect a quantum experiment: Quantum process tomography for open systemsJun 04 2007Oct 29 2009We study the effects of preparation of input states in a quantum tomography experiment. We show that maps arising from a quantum process tomography experiment (called process maps) differ from the well know dynamical maps. The difference between the two ... More
Quantum Markov OrderMay 29 2018Apr 10 2019We formally extend the notion of Markov order to open quantum processes by accounting for the instruments used to probe the system of interest at different times. Our description recovers the classical Markov order property in the appropriate limit: when ... More
Divisible quantum dynamics satisfies temporal Tsirelson's boundOct 15 2015Jan 08 2017We give strong evidence that divisibility of qubit quantum processes implies temporal Tsirelson's bound. We also give strong evidence that the classical bound of the temporal Bell's inequality holds for dynamics that can be described by entanglement-breaking ... More
The Steep Road to Happily Ever After: An Analysis of Current Visual Storytelling ModelsApr 06 2019Visual storytelling is an intriguing and complex task that only recently entered the research arena. In this work, we survey relevant work to date, and conduct a thorough error analysis of three very recent approaches to visual storytelling. We categorize ... More
Local random potentials of high differentiability to model the LandscapeSep 17 2014Mar 10 2015We generate random functions locally via a novel generalization of Dyson Brownian motion, such that the functions are in a desired differentiability class, while ensuring that the Hessian is a member of the Gaussian orthogonal ensemble (other ensembles ... More
Contextual Markov Decision Processes using Generalized Linear ModelsMar 14 2019We consider the recently proposed reinforcement learning (RL) framework of Contextual Markov Decision Processes (CMDP), where the agent has a sequence of episodic interactions with tabular environments chosen from a possibly infinite set. The parameters ... More
A fast algorithm for identifying Friends-of-Friends halosJul 12 2016May 31 2017We describe a simple and fast algorithm for identifying friends-of-friends features and prove its correctness. The algorithm avoids unnecessary expensive neighbor queries, uses minimal memory overhead, and rejects slowdown in high over-density regions. ... More
Review of Different Privacy Preserving Techniques in PPDPAug 13 2018Big data is a term used for a very large data sets that have many difficulties in storing and processing the data. Analysis this much amount of data will lead to information loss. The main goal of this paper is to share data in a way that privacy is preserved ... More
Excessive distribution of quantum entanglementJun 05 2015Jun 09 2015We classify protocols of entanglement distribution as excessive and non-excessive ones. In a non-excessive protocol, the gain of entanglement is bounded by the amount of entanglement being communicated between the remote parties, while excessive protocols ... More
Operational Significance of Discord Consumption: Theory and ExperimentFeb 29 2012Aug 04 2012Coherent interactions that generate negligible entanglement can still exhibit unique quantum behaviour. This observation has motivated a search beyond entanglement for a complete description of all quantum correlations. Quantum discord is a promising ... More
Automated Coin Recognition System using ANNDec 23 2013Coins are integral part of our day to day life. We use coins everywhere like grocery store, banks, buses, trains etc. So it becomes a basic need that coins can be sorted and counted automatically. For this it is necessary that coins can be recognized ... More
Image Processing based Systems and Techniques for the Recognition of Ancient and Modern CoinsDec 23 2013Coins are frequently used in everyday life at various places like in banks, grocery stores, supermarkets, automated weighing machines, vending machines etc. So, there is a basic need to automate the counting and sorting of coins. For this machines need ... More
Towards Real-time Simulation of Hyperelastic MaterialsApr 25 2016We present a new method for real-time physics-based simulation supporting many different types of hyperelastic materials. Previous methods such as Position Based or Projective Dynamics are fast, but support only limited selection of materials; even classical ... More
The control of graphene double-layer formation in copper-catalyzed chemical vapor depositionAug 28 2012The growth of graphene during Cu-catalyzed chemical vapor deposition was studied using 12CH4 and 13CH4 precursor gasses. We suggest that the growth begins by the formation of a multilayer cluster. This seed increases its size but the growth speed of a ... More
Halo bias in Lagrangian Space: Estimators and theoretical predictionsDec 06 2016Nov 30 2017We present several methods to accurately estimate Lagrangian bias parameters and substantiate them using simulations. In particular, we focus on the quadratic terms, both the local and the non local ones, and show the first clear evidence for the latter ... More
Experimental demonstration of information to energy conversion in a quantum system at the Landauer LimitDec 19 2014Mar 14 2016Landauer's principle sets fundamental thermodynamical constraints for classical and quantum information processing, thus affecting not only various branches of physics, but also of computer science and engineering. Despite its importance, this principle ... More
Halo bias in Lagrangian Space: Estimators and theoretical predictionsDec 06 2016We present several methods to accurately estimate Lagrangian bias parameters, in particular the quadratic terms, both the local and the non local ones and show the first clear evidence for the latter. Using Fourier space correlations, we also show for ... More
Estimates for solutions of the $\partial$-equation and application to the characterization of the zero varieties of the functions of the nevanlinna class for lineally convex domains of finite typeFeb 07 2011Feb 19 2013In the late ten years, the resolution of the equation $\bar\partial u=f$ with sharp estimates has been intensively studied for convex domains of finite type by many authors. In this paper, we consider the case of lineally convex domains. As the method ... More
Cosmological Reconstruction From Galaxy Light: Neural Network Based Light-Matter ConnectionMay 06 2018We present a method to reconstruct the initial conditions of the universe using observed galaxy positions and luminosities under the assumption that the luminosities can be calibrated with weak lensing to give the mean halo mass. Our method relies on ... More
Estimates for some Weighted Bergman ProjectionsDec 05 2012May 23 2013In this paper we investigate the regularity properties of weighted Bergman projections for smoothly bounded pseudo-convex domains of finite type in $\mathbb{C}^{n}$. The main result is obtained for weights equal to a non negative rational power of the ... More
Modeling CMB Lensing Cross Correlations with {\sc CLEFT}Jun 10 2017A new generation of surveys will soon map large fractions of sky to ever greater depths and their science goals can be enhanced by exploiting cross correlations between them. In this paper we study cross correlations between the lensing of the CMB and ... More
On estimates for weighted Bergman projectionsMar 13 2014Apr 04 2014In this note we show that the weighted $L^{2}$-Sobolev estimates obtained by P. Charpentier, Y. Dupain & M. Mounkaila for the weighted Bergman projection of the Hilbert space $L^{2}\left(\Omega,d\mu_{0}\right)$ where $\Omega$ is a smoothly bounded pseudoconvex ... More
A Measurement of the Cosmological Constant Using Elliptical Galaxies as Strong Gravitational LensesNov 13 1996We have identified seven (field) elliptical galaxies acting as strong gravitational lenses and have used them to measure cosmological parameters. To find the most likely value for Omega_m (= Omega_matter) and Lambda, we have used the combined probabilities ... More
Cosmic Gravitational Shear from the HST Medium Deep SurveyNov 13 2003We present a measurement of cosmic shear on scales ranging from $ 10\arcsec $ to $ 2\arcmin $ in 347 WFPC2 images of random fields. Our result is based on shapes measured via image fitting and on a simple statistical technique; careful calibration of ... More
Strain Assessment in Graphene Through the Raman 2D' ModeApr 25 2018Accurate and simple local strain assessment in graphene is one of the crucial tasks in device characterization. Raman spectroscopy is often used for that purpose through monitoring of the G and 2D modes. However, the shifts of those two bands might be ... More
Deformation twin nucleation and twin variant selection in single crystal magnesium as a function of strain rateJan 30 2018Sep 27 2018Deformation twinning is an important deformation mechanism in a variety of materials, including metals and ceramics. This deformation mechanism is particularly important in low-symmetry hexagonal close-packed (hcp) metals such as Magnesium (Mg), Zirconium ... More
DeepSSM: A Deep Learning Framework for Statistical Shape Modeling from Raw ImagesSep 28 2018Statistical shape modeling is an important tool to characterize variation in anatomical morphology. Typical shapes of interest are measured using 3D imaging and a subsequent pipeline of registration, segmentation, and some extraction of shape features ... More
Interaction between graphene and copper substrate: The role of lattice orientationJan 31 2014We present a comprehensive study of graphene grown by chemical vapor deposition on copper single crystals with exposed (100), (110) and (111) faces. Direct examination of the as-grown graphene by Raman spectroscopy using a range of visible excitation ... More
A novel approach for e-payment using virtual password systemAug 19 2012In today's world of E-Commerce everything comes online like Music, E-Books, Shopping all most everything is online. If you are using some service or buying things online then you have to pay for that. For that you have to do Net Banking or you have to ... More