Publications (133)
Using a quantum SWAP engine to experimentally validate thermodynamic uncertainty relations
Krishna Shende, Arvind, Kavita Dorai
Thermodynamic uncertainty relations (TURs) arise from the bounds on fluctuations of thermodynamics quantities during a non-equilibrium process and they impose constraints on the co…
Revisiting the admissibility of non-contextual hidden variable models in quantum mechanics
Atul Singh Arora, Kishor Bharti, Arvind
We construct a non-contextual hidden variable model consistent with all the kinematic predictions of quantum mechanics (QM). The famous Bell-KS theorem shows that non-contextual mo…
No contextual advantage in non-paradoxical scenarios of two state vector formalism
Jaskaran Singh, Rajendra Singh Bhati, Arvind
The two state vector formalism (TSVF) was proposed by Aharonov, Bergmann, and Lebowitz (ABL) to provide a way for the counterfactual assignment of the probabilities of outcomes of…
Continuous variable quantum teleportation using photon subtracted and photon added two mode squeezed coherent state
Shikhar Arora, Chandan Kumar, Arvind
We consider non-Gaussian states generated by photon subtraction (PS) and photon addition (PA) on two-mode squeezed coherent (TMSC) states, as resource states for continuous variabl…
Constructing valid density matrices on an NMR quantum information processor via maximum likelihood estimation
Harpreet Singh, Arvind, Kavita Dorai
Estimation of quantum states is one of the most important steps in any quantum information processing experiment. A naive reconstruction of the density matrix from experimental mea…
State-independent robust heat-bath algorithmic cooling of nuclear spins
Krishna Shende, Arvind, Kavita Dorai
In this work, we experimentally demonstrate the implementation of a recently proposed robust and state-independent heat-bath algorithmic cooling (HBAC) method [1] on an NMR quantum…
Quantum operations restricted by no faster-than-light communication principle and generic emergence of objectivity in position basis
Rajendra Singh Bhati, Arvind
The emergence of the objective classical world from the quantum behavior of microscopic constituents is not fully understood. Models based on decoherence and the principle of quant…
Estimation of Wigner distribution of single mode Gaussian states: a comparative study
Chandan Kumar, Arvind
In this work, we consider the estimation of single mode Gaussian states using four different measurement schemes namely: i) homodyne measurement, ii) sequential measurement, iii) A…
Determining the parity of a permutation using an experimental NMR qutrit
Shruti Dogra, Arvind, Kavita Dorai
We present the NMR implementation of a recently proposed quantum algorithm to find the parity of a permutation. In the usual qubit model of quantum computation, speedup requires th…
Monogamy relations of entropic non-contextual inequalities and their experimental realization
Dileep Singh, Jaskaran Singh, Kavita Dorai +1
We develop a theoretical framework based on a graph theoretic approach to analyze monogamous relationships of entropic non-contextuality (ENC) inequalities. While ENC inequalities…
A classical optical approach to the `non-local Pancharatnam-like phases' in Hanbury-Brown-Twiss correlations
Arvind, S. Chaturvedi, N. Mukunda
We examine a recent proposal to show the presence of nonlocal Pancharatnam type geometric phases in a quantum mechanical treatment of intensity interferometry measurements upon inc…
Majorana representation, qutrit Hilbert space and NMR implementation of qutrit gates
Shruti Dogra, Kavita Dorai, Arvind
We report a study of the Majorana geometrical representation of a qutrit, where a pair of points on a unit sphere represents its quantum states. A canonical form for qutrit states…
Inferring physical laws by artificial intelligence based causal models
Jorawar Singh, Kishor Bharti, Arvind
The advances in Artificial Intelligence (AI) and Machine Learning (ML) have opened up many avenues for scientific research, and are adding new dimensions to the process of knowledg…
Entanglement properties of positive operators with ranges in completely entangled subspaces
R Sengupta, Arvind, Ajit Iqbal Singh
We prove that the projection on a completely entangled subspace S of maximum dimension in a multipartite quantum system obtained by Parthasarathy is not positive under partial tran…
Re-examination of the role of displacement and photon catalysis operation in continuous variable measurement device-independent quantum key distribution
Chandan Kumar, Arvind
We investigate the benefits of using -photon catalysed two-mode squeezed coherent (-PCTMSC) state in continuous variable measurement device-independent quantum key distributi…
Implementation of discrete positive operator valued measures on linear optical systems using cosine-sine decomposition
Jaskaran Singh, Arvind, Sandeep K. Goyal
Positive operator valued measurements (POVMs) play an important role in efficient quantum communication and computation. While optical systems are one of the strongest candidates f…
Quantum Computing by Two-Dimensional NMR using Spin- and Transition-Selective Pulses
T. S. Mahesh, Kavita Dorai, Arvind +1
Quantum computing using two-dimensional NMR has recently been described using scalar coupling evolution technique [J. Chem. Phys.,109,10603 (1998)]. In the present paper, we descri…
Optimizing Multitask Industrial Processes with Predictive Action Guidance
Naval Kishore Mehta, Arvind, Shyam Sunder Prasad +2
Monitoring complex assembly processes is critical for maintaining productivity and ensuring compliance with assembly standards. However, variability in human actions and subjective…
Classification and measurement of multipartite entanglement by reconstruction of correlation tensors on an NMR quantum processor
Vaishali Gulati, Arvind, Kavita Dorai
We introduce a protocol to classify three-qubit pure states into different entanglement classes and implement it on an NMR quantum processor. The protocol is designed in such a way…
Experimental construction of a W-superposition state and its equivalence to the GHZ state under local filtration
Debmalya Das, Shruti Dogra, Kavita Dorai +1
We experimentally construct a novel three-qubit entangled W-superposition () state on an NMR quantum information processor. We give a measurement-based filtratio…
Experimental Detection of Non-local Correlations using a Local Measurement-Based Hierarchy on an NMR Quantum Processor
Amandeep Singh, Dileep Singh, Vaishali Gulati +2
The non-local nature of the correlations possessed by quantum systems may be revealed by experimental demonstrations of the violation of Bell-type inequalities. Recent work has pla…
Implementation of a Deutsch-like quantum algorithm utilizing entanglement at the two-qubit level, on an NMR quantum information processor
Kavita Dorai, Arvind, Anil Kumar
We describe the experimental implementation of a recently proposed quantum algorithm involving quantum entanglement at the level of two qubits using NMR. The algorithm solves a gen…
Continuous variable quantum teleportation, invariant squeezing and non-Gaussian resource states
Mohak Sharma, Chandan Kumar, Shikhar Arora +1
We investigate the role of quadrature squeezing in the quantum teleportation protocol for coherent states, using non-Gaussian resource states. For the two-mode systems, the non-Gau…
Identifying Money Laundering Subgraphs on the Blockchain
Kiwhan Song, Mohamed Ali Dhraief, Muhua Xu +4
Anti-Money Laundering (AML) involves the identification of money laundering crimes in financial activities, such as cryptocurrency transactions. Recent studies advanced AML through…
U(2) invariant squeezing properties of pair coherent states
Arvind
The U(2) invariant approach is delineated for the pair coherent states to explore their squeezing properties. This approach is useful for a complete analysis of the squeezing prope…
Evolution of different orders of coherence of a three-qubit system and their protection via dynamical decoupling on an NMR quantum processor
Akanksha Gautam, Kavita Dorai, Arvind
We generate different orders of quantum coherence in a three-qubit NMR system and study their dynamics in the presence of inherent noise. Robust dynamical decoupling (DD) sequences…
Bargmann Invariants and Geometric Phases - a Generalised Connection
Eqab M. Rabei, Arvind, R. Simon +1
We develop the widest possible generalisation of the well-known connection between quantum mechanical Bargmann invariants and geometric phases. The key notion is that of null phase…
On `orbital' and `spin' angular momentum of light in classical and quantum theories -- a general framework
Arvind, Subhash Chaturvedi, N. Mukunda
We develop a general framework to analyze the two important and much discussed questions concerning (a) `orbital' and `spin' angular momentum carried by light and (b) the paraxial…
Bell's inequalities, multiphoton states and phase space distributions
Arvind, N. Mukunda
The connection between quantum optical nonclassicality and the violation of Bell's inequalities is explored. Bell type inequalities for the electromagnetic field are formulated for…
Weak measurement-based state estimation of Gaussian states of one-variable quantum systems
Debmalya Das, Arvind
We present a scheme to estimate Gaussian states of one-dimensional continuous variable systems, based on weak (unsharp) quantum measurements. The estimation of a Gaussian state req…
Neural network assisted quantum state and process tomography using limited data sets
Akshay Gaikwad, Omkar Bihani, Arvind +1
In this study we employ a feed-forward artificial neural network (FFNN) architecture to perform tomography of quantum states and processes obtained from noisy experimental data. To…
Simulating a single qubit channel using a mixed state environment
Geetu Narang, Arvind
We analyze the class of single qubit channels with the environment modeled by a one-qubit mixed state. The set of affine transformations for this class of channels is computed anal…
The Real Symplectic Groups in Quantum Mechanics and Optics
Arvind, B. Dutta, N. Mukunda +1
text of abstract (We present a utilitarian review of the family of matrix groups , in a form suited to various applications both in optics and quantum mechanics. We con…
Quantum Entanglement and Quantum Computational Algorithms
Arvind
The existence of entangled quantum states gives extra power to quantum computers over their classical counterparts. Quantum entanglement shows up qualitatively at the level of two…
Experimental demonstration of selective quantum process tomography on an NMR quantum information processor
Akshay Gaikwad, Diksha Rehal, Amandeep Singh +2
We present the first NMR implementation of a scheme for selective and efficient quantum process tomography without ancilla. We generalize this scheme such that it can be implemente…
Experimental investigation of a quantum Otto heat engine with shortcuts to adiabaticity implemented using counter-adiabatic driving
Krishna Shende, Matreyee Kandpal, Arvind +1
The finite time operation of a quantum Otto heat engine leads to a trade-off between efficiency and output power, which is due to the deviation of the system from the adiabatic pat…
Efficient experimental characterization of quantum processes via compressed sensing on an NMR quantum processor
Akshay Gaikwad, Arvind, Kavita Dorai
We employ the compressed sensing (CS) algorithm and a heavily reduced data set to experimentally perform true quantum process tomography (QPT) on an NMR quantum processor. We obtai…
Experimental protection of arbitrary states in a two-qubit subspace by nested Uhrig dynamical decoupling
Harpreet Singh, Arvind, Kavita Dorai
We experimentally demonstrate the efficacy of a three-layer nested Uhrig dynamical decoupling (NUDD) sequence to preserve arbitrary quantum states in a two-dimensional subspace of…
Experimental demonstration of the dynamics of quantum coherence evolving under a PT-symmetric Hamiltonian on an NMR quantum processor
Akanksha Gautam, Kavita Dorai, Arvind
In this work, we study the dynamics of quantum coherence (total coherence, global coherence and local coherence) evolving under a local PT-symmetric Hamiltonian in maximally entang…
Validating Simplified Processor Models in Architectural Studies
Sizhuo Zhang, Andrew Wright, Daniel Sanchez +1
Cycle-accurate software simulation of multicores with complex microarchitectures is often excruciatingly slow. People use simplified core models to gain simulation speed. However,…
Characterisations of Classical and Non-classical states of Quantised Radiation
Arvind, N. Mukunda, R. Simon
A new operator based condition for distinguishing classical from non-classical states of quantised radiation is developed. It exploits the fact that the normal ordering rule of cor…
Experimental construction of a symmetric three-qubit entangled state and its utility in testing the violation of a Bell inequality on an NMR quantum simulator
Dileep Singh, Vaishali Gulati, Arvind +1
We designed a quantum circuit to prepare a permutation-symmetric maximally entangled three-qubit state called the state and experimentally created it on an…
No real advantage of photon subtraction and displacement in continuous variable measurement device independent quantum key distribution
Chandan Kumar, Sarbani Chatterjee, Arvind
We critically analyse the role of single photon subtraction (SPS) and displacement in improving the performance of continuous variable measurement device independent quantum key di…
Experimental decoherence mitigation using a weak measurement-based scheme and the duality quantum algorithm
Gayatri Singh, Akshay Gaikwad, Arvind +1
We experimentally demonstrate a weak measurement and measurement reversal-based scheme to ameliorate the effects of decoherence due to amplitude damping, on an NMR quantum processo…
Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling
Harpreet Singh, Arvind, Kavita Dorai
We embarked upon the task of experimental protection of different classes of tripartite entangled states, namely the maximally entangled GHZ and W states and the …
Experimental quantum state transfer of an arbitrary single-qubit state on a cycle with four vertices using a coined quantum random walk
Gayatri Singh, Kavita Dorai, Arvind
We experimentally demonstrate the transfer of an unknown single-qubit state from Alice to Bob via a two-step discrete-time quantum random walk on a cycle with four vertices on a fo…
Measurement-based local quantum filters and their ability to transform quantum entanglement
Debmalya Das, Ritabrata Sengupta, Arvind
We introduce local filters as a means to detect the entanglement of bound entangled states which do not yield to detection by witnesses based on positive (P) maps which are not com…
True experimental reconstruction of quantum states and processes via convex optimization
Akshay Gaikwad, Arvind, Kavita Dorai
We use a constrained convex optimization (CCO) method to experimentally characterize arbitrary quantum states and unknown quantum processes on a two-qubit NMR quantum information p…
An Energy-Efficient Reconfigurable DTLS Cryptographic Engine for End-to-End Security in IoT Applications
Utsav Banerjee, Chiraag Juvekar, Andrew Wright +2
This paper presents a reconfigurable cryptographic engine that implements the DTLS protocol to enable end-to-end security for IoT. This implementation of the DTLS engine demonstrat…
Simulating Three-Flavor Neutrino Oscillations on an NMR Quantum Processor
Gayatri Singh, Arvind, Kavita Dorai
Neutrino oscillations can be efficiently simulated on a quantum computer using the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) theory in close analogy to the physical processes realized…
Effect of dissipative environment on collapses and revivals of a nonlinear quantum oscillator
Maninder Kaur, Bindiya Arora, Arvind
We study the dissipative dynamics of a wave packet passing through two different non-linear media. The effect of dissipation on the phenomenon of collapses and revivals of a wave p…
Experimental Detection of Qubit-Ququart Pseudo-Bound Entanglement using Three Nuclear Spins
Amandeep Singh, Akanksha Gautam, Arvind +1
In this work, we experimentally created and characterized a class of qubit-ququart PPT (positive under partial transpose) entangled states using three nuclear spins on an nuclear m…
Experimental construction of generic three-qubit states and their reconstruction from two-party reduced states on an NMR quantum information processor
Shruti Dogra, Kavita Dorai, Arvind
We experimentally explore the state space of three qubits on an NMR quantum information processor. We construct a scheme to experimentally realize a canonical form for general thre…
Brownian Motion in a Classical Ideal Gas: a Microscopic Approach to Langevin's Equation
Rangan Lahiri, Arvind, Anirban Sain
We present an insightful ``derivation'' of the Langevin equation and the fluctuation dissipation theorem in the specific context of a heavier particle moving through an ideal gas o…
ANN-Enhanced Detection of Multipartite Entanglement in a Three-Qubit NMR Quantum Processor
Vaishali Gulati, Shivanshu Siyanwal, Arvind +1
We use an artificial neural network (ANN) model to identify the entanglement class of an experimentally generated three-qubit pure state drawn from one of the six inequivalent clas…
Quantum entanglement in the NMR implementation of the Deutsch-Jozsa algorithm
Arvind, Kavita Dorai, Anil Kumar
A scheme to execute an n-bit Deutsch-Jozsa (D-J) algorithm using n qubits has been implemented for up to three qubits on an NMR quantum computer. For the one and two bit Deutsch pr…
Direct tomography of quantum states and processes via weak measurements of Pauli spin operators on an NMR quantum processor
Akshay Gaikwad, Gayatri Singh, Kavita Dorai +1
In this paper, we present an efficient weak measurement-based scheme for direct quantum state tomography (DQST) and direct quantum process tomography (DQPT), and experimentally imp…
Evolution of two-mode quantum states under a dissipative environment: which quantum resource survives better, squeezing or entanglement?
Rishabh, Chandan Kumar, Geetu Narang +1
We explore the relative robustness of squeezing and entanglement (which are quantum resources interconvertible via passive optics) for two-mode Gaussian states under different diss…
Implementing efficient selective quantum process tomography of superconducting quantum gates on the IBM quantum processor
Akshay Gaikwad, Krishna Shende, Arvind +1
The experimental implementation of selective quantum process tomography (SQPT) involves computing individual elements of the process matrix with the help of a special set of states…
Two Mode Quantum Systems: Invariant Classification of Squeezing Transformations and Squeezed States
Arvind, B. Dutta, N. Mukunda +1
A general analysis of squeezing transformations for two mode systems is given based on the four dimensional real symplectic group $Sp(4,\Re)\/$. Within the framework of the unitary…
Properties of Spin and Orbital Angular Momenta of Light
Arvind, S. Chaturvedi, N. Mukunda
This paper analyzes the algebraic and physical properties of the spin and orbital angular momenta of light in the quantum mechanical framework. The consequences of the fact that th…
Geometric phases for finite-dimensional systems -- the roles of Bargmann Invariants, Null Phase Curves and the Schwinger Majorana SU(2) framework
K S Akhilesh, Arvind, S Chaturvedi +2
We present a study of the properties of Bargmann Invariants (BI) and Null Phase Curves (NPC) in the theory of the geometric phase for finite dimensional systems. A recent suggestio…
Entanglement Classification of Arbitrary Three-Qubit States via Artificial Neural Networks
Jorawar Singh, Vaishali Gulati, Kavita Dorai +1
We design and successfully implement artificial neural networks (ANNs) to detect and classify entanglement for three-qubit systems using limited state features. The overall design…
Weak Memory Models with Matching Axiomatic and Operational Definitions
Sizhuo Zhang, Muralidaran Vijayaraghavan, Dan Lustig +1
Memory consistency models are notorious for being difficult to define precisely, to reason about, and to verify. More than a decade of effort has gone into nailing down the definit…
Relativistic Operator Description of Photon Polarization
Arvind, N. Mukunda
We present an operator approach to the description of photon polarization, based on Wigner's concept of elementary relativistic systems. The theory of unitary representations of th…
BigSparse: High-performance external graph analytics
Sang-Woo Jun, Andy Wright, Sizhuo Zhang +2
We present BigSparse, a fully external graph analytics system that picks up where semi-external systems like FlashGraph and X-Stream, which only store vertex data in memory, left o…
Entanglement detection on an NMR quantum information processor using random local measurements
Amandeep Singh, Arvind, Kavita Dorai
Random local measurements have recently been proposed to construct entanglement witnesses and thereby detect the presence of bipartite entanglement. We experimentally demonstrate t…
Experimental investigation of coherence contributions to a nonequilibrium thermodynamic process in a driven quantum system
Krishna Shende, Kavita Dorai, Arvind
The work done when a system at thermal equilibrium is externally driven by a unitary control parameter leads to irreversible entropy production. The entropy produced can be thought…
Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
Chandan Kumar, Gaurav Saxena, Arvind
We consider a multiphoton Bell-type inequality to study nonlocality in four-mode continuous variable systems, which goes beyond two-photon states and can be applied to mixed as wel…
Optimization of state parameters in displacement assisted photon subtracted measurement-device-independent quantum key distribution
Chandan Kumar, Sarbani Chatterjee, Arvind
Non-Gaussian operations, in particular, photon subtraction (PS), have been shown to enhance the performance of various quantum information processing tasks including continuous var…
Ground and excited state energy calculations of the H2 molecule using a variational quantum eigensolver algorithm on an NMR quantum simulator
Dileep Singh, Shashank Mehendale, Arvind +1
Variational quantum algorithms are emerging as promising candidates for near-term practical applications of quantum information processors, in the field of quantum chemistry. We im…
Leveraging ASIC AI Chips for Homomorphic Encryption
Jianming Tong, Tianhao Huang, Jingtian Dang +9
Homomorphic Encryption (HE) provides strong data privacy for cloud services but at the cost of prohibitive computational overhead. While GPUs have emerged as a practical platform f…
Do weak values capture the complete truth about the past of a quantum particle?
Rajendra Singh Bhati, Arvind
Weak values inferred from weak measurements have been proposed as a tool to investigate trajectories of pre- and post-selected quantum systems. Are the inferences drawn from the we…
An Operational Framework for Specifying Memory Models using Instantaneous Instruction Execution
Sizhuo Zhang, Muralidaran Vijayaraghavan, Arvind
There has been great progress recently in formally specifying the memory model of microprocessors like ARM and POWER. These specifications are, however, too complicated for reasoni…
The Sampling Theorem and Coherent State Systems in Quantum Mechanics
Arvind, S. Chaturvedi, N. Mukunda +1
The well known Poisson Summation Formula is analysed from the perspective of the coherent state systems associated with the Heisenberg--Weyl group. In particular, it is shown that…
Random sampling of an AC source: A tool to teach probabilistic observations
Arvind, P. S. Chandi, R. C. Singh +2
An undergraduate level experiment is described to demonstrate the role of probabilistic observations in physics. A capacitor and a DC voltmeter are used to randomly sample an AC vo…
Optimal characterization of Gaussian channels using photon-number-resolving detectors
Chandan Kumar, Ritabrata Sengupta, Arvind
We present optimal schemes, based on photon number measurements, for Gaussian state tomography and for Gaussian process tomography. An -mode Gaussian state is completely specifi…
Constructing a Weak Memory Model
Sizhuo Zhang, Muralidaran Vijayaraghavan, Andrew Wright +2
Weak memory models are a consequence of the desire on part of architects to preserve all the uniprocessor optimizations while building a shared memory multiprocessor. The efforts t…
Intrinsic nonlinearity of a PN-junction diode and higher order harmonic generation
Samridhi Gambhir, Arvind, Mandip Singh
Voltage current characteristics of a PN-junction diode are intrinsically nonlinear in nature. It is shown in this paper that a mathematical form of nonlinearity of a PN-junction di…
Witnessing nonclassical correlations via a single-shot experiment on an ensemble of spins using NMR
Amandeep Singh, Arvind, Kavita Dorai
A bipartite quantum system in a mixed state can exhibit nonclassical correlations, which can go beyond quantum entanglement. While quantum discord is the standard measure of quanti…
General radiation states and Bell's inequalities
Arvind, N. Mukunda
The connection between quantum optical nonclassicality and the violation of Bell's inequalities is explored. Bell type inequalities for the electromagnetic field are formulated for…
In-Storage Embedded Accelerator for Sparse Pattern Processing
Sang-Woo Jun, Huy T. Nguyen, Vijay N. Gadepally +1
We present a novel architecture for sparse pattern processing, using flash storage with embedded accelerators. Sparse pattern processing on large data sets is the essence of applic…
Symplectic group methods and the Arthurs Kelly model of measurement in quantum mechanics
Arvind, S. Chaturvedi, N. Mukunda
We study the use of methods based on the real symplectic groups in the analysis of the Arthurs-Kelly model of proposed simultaneous measurements of position an…
Wigner distributions and quantum mechanics on Lie groups: the case of the regular representation
N. Mukunda, Arvind, S. Chaturvedi +1
We consider the problem of setting up the Wigner distribution for states of a quantum system whose configuration space is a Lie group. The basic properties of Wigner distributions…
Non-classical Photon Statistics For Two-mode Optical Fields
Arvind, N. Mukunda
The non-classical property of subpoissonian photon statistics is extended from one to two-mode electromagnetic fields, incorporating the physically motivated property of invariance…
Weak Memory Models: Balancing Definitional Simplicity and Implementation Flexibility
Sizhuo Zhang, Muralidaran Vijayaraghavan, Arvind
The memory model for RISC-V, a newly developed open source ISA, has not been finalized yet and thus, offers an opportunity to evaluate existing memory models. We believe RISC-V sho…
Quantum Private Comparison over noisy channels
Vikesh Siddhu, Arvind
Quantum Private Comparison (QPC) allows us to protect private information during its comparison. In the past various three-party quantum protocols have been proposed that claim to…
Entanglement and Complete Positivity: Relevance and Manifestations in Classical Scalar Wave Optics
Arvind, S. Chaturvedi, N. Mukunda
Entanglement of states and Complete Positivity of maps are concepts that have achieved physical importance with the recent growth of quantum information science. They are however m…
Quantum state estimation using weak measurements
Debmalya Das, Arvind
We explore the possibility of using "weak measurements" without "weak value" for quantum state estimation. Since for weak measurements the disturbance caused during each measuremen…
Experimental Classification of Entanglement in Arbitrary Three-Qubit States on an NMR Quantum Information Processor
Amandeep Singh, Harpreet Singh, Kavita Dorai +1
We undertake experimental detection of the entanglement present in arbitrary three-qubit pure quantum states on an NMR quantum information processor. Measurements of only four obse…
Efficient experimental design of high-fidelity three-qubit quantum gates via genetic programming
Amit Devra, Prithviraj Prabhu, Harpreet Singh +2
We have designed efficient quantum circuits for the three-qubit Toffoli (controlled-controlled NOT) and the Fredkin (controlled-SWAP) gate, optimized via genetic programming method…
Nonclassicality and the concept of local constraints on the photon number distribution
R. Simon, Mary Selvadoray, Arvind +1
We exploit results from the classical Stieltjes moment problem to bring out the totality of all the information regarding phase insensitive nonclassicality of a state as captured b…
Experimentally freezing quantum discord in a dissipative environment using dynamical decoupling
Harpreet Singh, Arvind, Kavita Dorai
The discovery of the intriguing phenomenon that certain kinds of quantum correlations remain impervious to noise up to a specific point in time and then suddenly decay, has generat…
A comparative study of system size dependence of the effect of non-unitary channels on different classes of quantum states
Geetu Narang, Shruti Dogra, Arvind
We investigate the effect of different types of non-unitary quantum channels on multi-qubit quantum systems. For an -qubit system and a particular channel, in order to draw unbi…
Role of Bell-CHSH violation and local filtering in quantum key distribution
Jaskaran Singh, Sibasish Ghosh, Arvind +1
In this article, we analyse the relationship between the Bell violation and the secure key rate of entanglement assisted quantum key distribution (QKD) protocols. Specifically, we…
Experimental demonstration of fully contextual quantum correlations on an NMR quantum information processor
Dileep Singh, Jaskaran Singh, Kavita Dorai +1
The existence of contextuality in quantum mechanics is a fundamental departure from the classical description of the world. Currently, the quest to identify scenarios which cannot…
Efficient and Scalable Graph Pattern Mining on GPUs
Xuhao Chen, Arvind
Graph Pattern Mining (GPM) extracts higher-order information in a large graph by searching for small patterns of interest. GPM applications are computationally expensive, and thus…
Increasing distillable key rate from bound entangled states by using local filtration
Mayank Mishra, Ritabrata Sengupta, Arvind
We show the enhancement of distillable key rate for quantum key distribution(QKD), by local filtering, for several bound entangled states. Through our work it becomes evident that…
Experimental demonstration of quantum contextuality on an NMR qutrit
Shruti Dogra, Kavita Dorai, Arvind
We experimentally test quantum contextuality of a single qutrit using NMR. The contextuality inequalities based on nine observables developed by Kurzynski et. al. are first reformu…
Bargmann invariants and off-diagonal geometric phases for multi-level quantum systems -- a unitary group approach
N. Mukunda, Arvind, S. Chaturvedi +1
We investigate the geometric phases and the Bargmann invariants associated with a multi-level quantum systems. In particular, we show that a full set of `gauge-invariant' objects f…