224 citations · 597 across the 34 of their papers we have counts for
34 papers
Robust Genuine Multipartite Entanglement in Two Walker Quantum Walks
Sandipan Hazra, Tamoghna Das, Sougato Bose +1
Discrete-time quantum walks provide a versatile framework for investigating the generation, redistribution, and transport of quantum correlations in composite quantum systems. Here…
Security of deterministic key distribution with higher-dimensional systems
Abhishek Muhuri, Ayan Patra, Rivu Gupta +2
We analyze the security of two-way quantum key distribution using arbitrary finite-dimensional systems, considering both individual and collective eavesdropping attacks, without th…
"Nonlocality-of-a-single-photon" based Quantum Key Distribution and Random Number Generation schemes and their device-independent security analysis
Konrad Schlichtholz, Bianka Woloncewicz, Tamoghna Das +2
The question of ``non-locality of a single photon'', which started with a paper by Tan, Walls and Collett (TWC, 1991) stirred a thirty years long debate. This hampered attempts to…
Dimensional advantage in secure information trading via the noisy dense coding protocol
Ayan Patra, Rivu Gupta, Tamoghna Das +1
The quantum dense coding (DC) protocol, which has no security feature, deals with the transmission of classical information encoded in a quantum state by using shared entanglement…
Improved entanglement indicators for optical fields and its application in the event-ready experiment for bright squeezed vacuum with induced non-gaussianity
Bianka Woloncewicz, Tamoghna Das, Marek Żukowski
Better versions of separability conditions for four mode optical fields, i.e. two beams with two modes of mutually orthogonal polarization are given. Our conditions involve varianc…
Quantum Dense Coding Network using Multimode Squeezed States of Light
Ayan Patra, Rivu Gupta, Saptarshi Roy +2
We present a framework of a multimode dense coding network with multiple senders and a single receiver using continuous variable systems. The protocol is scalable to arbitrary numb…
Quantum illumination with a light absorbing target
Rivu Gupta, Saptarshi Roy, Tamoghna Das +1
In a quantum illumination (QI) protocol, the task is to detect the presence of the target which is typically modelled by a partially reflecting beam splitter. We analyze the perfor…
Optimal interferometry for Bellnonclassicality by a vacuumonephoton qubit
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +2
Bell nonclassicality of a single photon superposition in two modes, often referred to as `nonlocality of a single photon', is one of the most striking nonclassical phenomena discus…
Comment on `Single particle nonlocality with completely independent reference states'
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
We comment on the purported violation of local realism, by a single photon induced correlations between homodyne detectors, which one can find in: New J. Phys. 10, 113024 (2008), […
Quantum illumination with noisy probes: Conditional advantages of non-Gaussianity
Rivu Gupta, Saptarshi Roy, Tamoghna Das +1
Entangled states, like the two-mode squeezed vacuum state, are known to give quantum advantage in the illumination protocol, a method to detect a weakly reflecting target submerged…
On detecting violation of local realism with photon-number resolving weak-field homodyne measurements
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
Non-existence of a local hidden variables (LHV) model for a phenomenon benchmarks its use in device-independent quantum protocols. Nowadays photon-number resolving weak-field homod…
Localizing genuine multimode entanglement: Asymmetric gains via non-Gaussianity
Ratul Banerjee, Saptarshi Roy, Tamoghna Das +1
Measurement-based quantum correlation mimics several characteristics of multipartite quantum correlations and at the same time, it reduces the parent system to a smaller subsystem.…
Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via homodyne measurements?
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
We reconsider the all-optical homodyne-measurement based experimental schemes that aim to reveal Bell nonclassicality of a single photon, often termed `nonlocality'. We focus on th…
No-go for device independent protocols with Tan-Walls-Collett `nonlocality of a single photon'
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
We investigate the interferometric scheme put forward by Tan, Walls and Collett [Phys. Rev. Lett. {\bf 66}, 256 (1991)] that aims to reveal Bell non-classicality of a single photon…
Computable genuine multimode entanglement measure: Gaussian vs. non-Gaussian
Saptarshi Roy, Tamoghna Das, Aditi Sen De
Genuine multimode entanglement in continuous variable systems can be quantified by exploring the geometry of the state-space, namely via the generalized geometric measure (GGM) whi…
Complete extension: the non-signaling analog of quantum purification
Marek Winczewski, Tamoghna Das, John H. Selby +5
Deriving quantum mechanics from information-theoretic postulates is a recent research direction taken, in part, with the view of finding a beyond-quantum theory; once the postulate…
Response in violation of Bell inequality to imperfect photon addition and subtraction in noisy squeezed states of light
Saptarshi Roy, Titas Chanda, Tamoghna Das +2
Violation of Bell inequality is a prominent detection method for quantum correlations present in composite quantum systems, both in finite and infinite dimensions. We investigate t…
Canonical Leggett-Garg Inequality: Nonclassicality of temporal quantum correlations under energy constraint
Titas Chanda, Tamoghna Das, Shiladitya Mal +2
Nonclassicality of temporal correlations pertaining to noncommutative sequential measurements is defined through the violation of macrorealistic inequalities, known as Leggett-Garg…
How efficient is transport of quantum cargo through multiple highways?
Saptarshi Roy, Tamoghna Das, Debmalya Das +2
Quantum states can be efficiently transferred over a long distance if the entire quantum channel can be divided into several small blocks. We consider a scenario in which each bloc…
Phase boundaries in alternating field quantum XY model with Dzyaloshinskii-Moriya interaction: Sustainable entanglement in dynamics
Saptarshi Roy, Titas Chanda, Tamoghna Das +3
We report all phases and corresponding critical lines of the quantum anisotropic transverse XY model with Dzyaloshinskii-Moriya (DM) interaction along with uniform and alternating…
Deterministic Quantum Dense Coding Networks
Saptarshi Roy, Titas Chanda, Tamoghna Das +2
We consider the scenario of deterministic classical information transmission between multiple senders and a single receiver, when they a priori share a multipartite quantum state -…
Emergence of entanglement with temperature and time in factorization-surface states
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
There exist zero-temperature states in quantum many-body systems that are fully factorized, thereby possessing vanishing entanglement, and hence being of no use as resource in quan…
Quantum discord and its allies: a review
Anindita Bera, Tamoghna Das, Debasis Sadhukhan +3
We review concepts and methods associated with quantum discord and related topics. We also describe their possible connections with other aspects of quantum information and beyond,…
Scale-invariant freezing of entanglement
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
We show that bipartite entanglement in a one-dimensional quantum spin model undergoing time-evolution under local Markovian environments can be frozen over time. We demonstrate thi…