25 citations · 205 across the 29 of their papers we have counts for
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Hybrid nonlocality via atom photon interactions with and without impurities
Pritam Halder, Ratul Banerjee, Saptarshi Roy +1
To obtain Bell statistics from hybrid systems composed of finite- and infinite-dimensional systems, we propose a hybrid measurement scheme, in which the continuous mode is measured…
Quantum networks boosted by entanglement with a control system
Tamal Guha, Saptarshi Roy, Giulio Chiribella
Networks of quantum devices with coherent control over their configuration offer promising advantages in quantum information processing. So far, the investigation of these advantag…
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…
Significance of Fidelity Deviation in Continuous Variable Teleportation
Ayan Patra, Rivu Gupta, Saptarshi Roy +1
Performance of quantum teleportation is typically measured by the average fidelity, an overlap between the input and output states. Along with the first moment, we introduce the se…
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…
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…
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.…
Emergence of Monogamy under Static and Dynamic Scenarios
Rivu Gupta, Saptarshi Roy, Shiladitya Mal +1
Characterizing multipartite quantum correlations beyond two parties is of utmost importance for building cutting edge quantum technologies, although the comprehensive picture is st…
Robustness of Higher Dimensional Nonlocality against dual noise and sequential measurements
Saptarshi Roy, Asmita Kumari, Shiladitya Mal +1
Robustness in the violation of Collins-Linden-Gisin-Masser-Popescu (CGLMP) inequality is investigated from the dual perspective of noise in measurements as well as in states. To qu…
Gain in Performance of Teleportation with Uniformity-breaking Distributions
Saptarshi Roy, Shiladitya Mal, Aditi Sen De
Prior information about the input state can be utilized to enhance the efficiency of quantum teleportation which we quantify using the first two moments of fidelity. The input know…
Restrictions on shareability of classical correlations for random multipartite quantum states
Saptarshi Roy, Shiladitya Mal, Aditi Sen De
Unlike quantum correlations, the shareability of classical correlations (CCs) between two-parties of a multipartite state is assumed to be free since there exist states for which C…
Distribution of entanglement with variable range interactions
Leela Ganesh Chandra Lakkaraju, Srijon Ghosh, Saptarshi Roy +1
Distribution of quantum entanglement is investigated for an anisotropic quantum XY model with variable range interactions and in the presence of a uniform transverse magnetic field…
Rating the performance of noisy teleportation using fluctuations in fidelity
Saptarshi Roy, Arkaprabha Ghosal
Quantum teleportation is one of the most pioneering features of the quantum world. Typically, the quality of a teleportation protocol is solely judged by its average fidelity. In t…
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…
Optimal two-qubit states for quantum teleportation vis-à-vis state properties
Arkaprabha Ghosal, Debarshi Das, Saptarshi Roy +1
Quantum teleportation with a two-qubit state can be suitably characterized in terms of maximal fidelity and fidelity deviation, where the former is the maximal value of the average…
Response of macroscopic and microscopic dynamical quantifiers to the quantum critical region
Stav Haldar, Saptarshi Roy, Titas Chanda +1
At finite temperatures, the quantum critical region (QCR) emerges as a consequence of the interplay between thermal and quantum fluctuations. We seek for suitable physical quantiti…
Fidelity deviation in quantum teleportation with a two-qubit state
Arkaprabha Ghosal, Debarshi Das, Saptarshi Roy +1
Quantum teleportation with an arbitrary two-qubit state can be appropriately characterized in terms of maximal fidelity and fidelity deviation. The former quantifies optimality of…
Recycling the resource: Sequential usage of shared state in quantum teleportation with weak measurements
Saptarshi Roy, Anindita Bera, Shiladitya Mal +2
Complete measurements, while providing maximal information gain, results in destruction of the shared entanglement. In the standard teleportation scheme, the sender's measurement o…
Multipartite entanglement at dynamical quantum phase transitions with non-uniformly spaced criticalities
Stav Haldar, Saptarshi Roy, Titas Chanda +2
We report dynamical quantum phase transition portrait in the alternating field transverse XY spin chain with Dzyaloshinskii-Moriya interaction by investigating singularities in the…
Universality in Distribution of Monogamy Scores for Random Multiqubit Pure States
Soorya Rethinasamy, Saptarshi Roy, Titas Chanda +2
Monogamy of quantum correlations provides a way to study restrictions on their sharability in multiparty systems. We find the critical exponent of these measures, above which rando…
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…
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 -…