581 citations · 2.3k across the 63 of their papers we have counts for
65 papers
Simple proof of conditions requiring maximal entanglement for local state verification and discrimination
Somshubhro Bandyopadhyay
For deterministic state verification by separable measurements, the Schmidt rank of an entangled resource must be at least that of the state being verified [N. Yu, R. Duan, and M.…
Perfect discrimination of an orthogonal basis may require collective separable measurements on two copies
Somshubhro Bandyopadhyay
We consider an orthogonal basis of with three entangled states and one product state. This basis is not perfectly distinguishable by LOCC or even by…
Quantum state exclusion with many copies
Debanjan Roy, Tathagata Gupta, Pratik Ghosal +2
Quantum state exclusion is the task of identifying at least one state from a known set that was not used in the preparation of a quantum system. A set of quantum states is said to…
Quantum nonlocality without entanglement and state discrimination measures
Shayeef Murshid, Tathagata Gupta, Vincent Russo +1
An ensemble of product states is said to exhibit "quantum nonlocality without entanglement" if it cannot be optimally discriminated using local operations and classical communicati…
Optimal discrimination of quantum sequences
Tathagata Gupta, Shayeef Murshid, Vincent Russo +1
A key concept of quantum information theory is that accessing information encoded in a quantum system requires us to discriminate between several possible states the system could b…
Locally distinguishing a maximally entangled basis using shared entanglement
Somshubhro Bandyopadhyay, Vincent Russo
We consider the problem of distinguishing between the elements of a bipartite maximally entangled orthonormal basis using local operations and classical communication (LOCC) and a…
Unambiguous discrimination of sequences of quantum states
Tathagata Gupta, Shayeef Murshid, Somshubhro Bandyopadhyay
We consider the problem of determining the state of an unknown quantum sequence without error. The elements of the given sequence are drawn with equal probability from a known set…
Channel assisted noise propagation in a two-step cascade
Mintu Nandi, Sudip Chattopadhyay, Somshubhro Bandyopadhyay +1
Signal propagation in biochemical networks is characterized by the inherent randomness in gene expression and fluctuations of the environmental components, commonly known as intrin…
Distribution of quantum gravity induced entanglement in many-body systems
Pratik Ghosal, Arkaprabha Ghosal, Somshubhro Bandyopadhyay
Recently, it was shown that if two distant test masses, each in a spatially superposed quantum state, become entangled due to their mutual gravitational interaction, then this enta…
Quantum change point and entanglement distillation
Abhishek Banerjee, Pratapaditya Bej, Somshubhro Bandyopadhyay
In a quantum change point problem, a source emitting particles in a fixed quantum state (default) switches to a different state at some stage, and the objective is to identify when…
Conditions for local transformations between sets of quantum states
Somshubhro Bandyopadhyay, Saronath Halder, Ritabrata Sengupta
We study the problem of transforming a set of pure bipartite states into another using deterministic LOCC (local operations and classical communication). Necessary conditions for t…
Quantum communication using a quantum switch of quantum switches
Debarshi Das, Somshubhro Bandyopadhyay
The quantum switch describes a quantum operation in which two or more quantum channels act on a quantum system with the order of application determined by the state of an order qua…
Entanglement cost of discriminating noisy Bell states by local operations and classical communication
Somshubhro Bandyopadhyay, Vincent Russo
Entangled states can help in quantum state discrimination by local operations and classical communication (LOCC). For example, a Bell state is necessary (and sufficient) to perfect…
Genuine activation of nonlocality: From locally available to locally hidden information
Somshubhro Bandyopadhyay, Saronath Halder
Quantum nonlocality has different manifestations that, in general, are revealed by local measurements of the parts of a composite system. In this paper, we study nonlocality arisin…
Impossibility of creating a superposition of unknown quantum states
Somshubhro Bandyopadhyay
The superposition principle is fundamental to quantum theory. Yet a recent no-go theorem has proved that quantum theory forbids superposition of unknown quantum states, even with n…
Information-disturbance trade-off in generalized entanglement swapping
Pratapaditya Bej, Arkaprabha Ghosal, Debarshi Das +2
We study information-disturbance trade-off in generalized entanglement swapping protocols wherein starting from Bell pairs and , one performs a…
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…
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…
Strong Quantum Nonlocality without Entanglement
Saronath Halder, Manik Banik, Sristy Agrawal +1
Quantum nonlocality is usually associated with entangled states by their violations of Bell-type inequalities. However, even unentangled systems, whose parts may have been prepared…
Entanglement gain in measurements with unknown results
Margherita Zuppardo, Ray Ganardi, Marek Miller +2
We characterise non-selective global projective measurements capable of increasing quantum entanglement between two particles. We show that non-selective global projective measurem…
Entanglement sharing via qudit channels: Nonmaximally entangled states may be necessary for one-shot optimal singlet fraction and negativity
Rajarshi Pal, Somshubhro Bandyopadhyay
We consider the problem of establishing entangled states of optimal singlet fraction and negativity between two remote parties for every use of a noisy quantum channel and trace-pr…
Optimal resource states for local state discrimination
Somshubhro Bandyopadhyay, Saronath Halder, Michael Nathanson
We study the problem of locally distinguishing pure quantum states using shared entanglement as a resource. For a given set of locally indistinguishable states, we define a resourc…
Entanglement as a resource for local state discrimination in multipartite systems
Somshubhro Bandyopadhyay, Saronath Halder, Michael Nathanson
We explore the question of using an entangled state as a universal resource for implementing quantum measurements by local operations and classical communication (LOCC). We show th…
Reciprocal ontological models show indeterminism of the order of quantum theory
Somshubhro Bandyopadhyay, Manik Banik, Some Sankar Bhattacharya +4
The question whether indeterminism in quantum measurement outcomes is fundamental or is there a possibility of constructing a finer theory underlying quantum mechanics that allows…