119 citations · 249 across the 16 of their papers we have counts for
16 papers
Minimal Help, Maximal Gain: Environmental Assistance Unlocks Encoding Strength
Snehasish Roy Chowdhury, Sutapa Saha, Subhendu B. Ghosh +2
For any quantum transmission line, with smaller output dimension than its input, the number of classical symbols that can be reliably encoded is strictly suboptimal. In other words…
Interference between lossy quantum evolutions activates information backflow
Sutapa Saha, Ujjwal Sen
Quantum evolutions are often non-unitary and in such cases, they are frequently regarded as lossy. Such lossiness, however, does not necessarily persist throughout the evolution, a…
The communication power of a noisy qubit
Giulio Chiribella, Saptarshi Roy, Tamal Guha +1
A fundamental limitation of quantum communication is that a single qubit can carry at most 1 bit of classical information. For an important class of quantum communication channels,…
Local Inaccessibility of Random Classical Information and Their Implications in the Change Point Problem
Snehasish Roy Chowdhury, Subhendu B. Ghosh, Tathagata Gupta +4
Discrimination of quantum states under local operations and classical communication (LOCC) is an intriguing question in the context of local retrieval of classical information, enc…
decay of neutron-rich Cl at magic number N=28
Soumik Bhattacharya, Vandana Tripathi, S. L. Tabor +25
Results from the study of -decay of Cl, produced in the fragmentation of a 140-MeV/u Ca beam, are presented. The half-life for Cl -decay is measured to…
Bipartite polygon models: entanglement classes and their nonlocal behaviour
Mayalakshmi Kolangatt, Thigazholi Muruganandan, Sahil Gopalkrishna Naik +3
Hardy's argument constitutes an elegantly logical test for identifying nonlocal features of multipartite correlations. In this paper, we investigate Hardy's nonlocal behavior withi…
Genuine Activation of Quantum Nonlocality: Stronger Than Local Indistinguishability
Tathagata Gupta, Subhendu B. Ghosh, Ardra A +5
The structure of quantum theory assures the discrimination of any possible orthogonal set of states. However, the scenario becomes highly nontrivial in the limited measurement sett…
Activating Strongest Possible Nonlocality from Local Sets: An Elimination Paradigm
Subhendu B. Ghosh, Tathagata Gupta, Ardra A. V. +4
Apart from the Bell nonlocality, which deals with the correlations generated from the local input-output statistics, quantum theory exhibits another kind of nonlocality that involv…
Local Quantum State Marking
Samrat Sen, Edwin Peter Lobo, Sahil Gopalkrishna Naik +8
We propose the task of local state marking (LSM), where some multipartite quantum states chosen randomly from a known set of states are distributed among spatially separated partie…
Quantum theory is exclusive: a distributed computing setup
Sutapa Saha, Tamal Guha, Some Sankar Bhattacharya +1
The framework of distributed computing, consisting of several spatially separated input-output servers, has immense importance in distant data manipulation. One of the most challen…
Nonlocality Without Entanglement: Quantum Theory and Beyond
Some Sankar Bhattacharya, Sutapa Saha, Tamal Guha +1
Quantum nonlocality without entanglement (Q-NWE) encapsulates nonlocal behavior of multipartite product states as they may entail global operation for optimal decoding of the class…
The principle of information symmetry constrains the state-space in any physical theory
Manik Banik, Sutapa Saha, Tamal Guha +4
Symmetry shares an entwined history with the structure of physical theory. We propose a consequence of symmetry towards the axiomatic derivation of Hilbert space quantum theory. We…
Indefinite causal order enables perfect quantum communication with zero capacity channels
Giulio Chiribella, Manik Banik, Some Sankar Bhattacharya +6
Quantum mechanics is compatible with scenarios where the relative order between two events can be indefinite. Here we show that two independent instances of a noisy process can beh…
Sharing of tripartite nonlocality by multiple observers measuring sequentially at one side
Sutapa Saha, Debarshi Das, Souradeep Sasmal +4
Standard tripartite nonlocality and genuine tripartite nonlocality can be detected by the violations of Mermin inequality and Svetlichny inequality, respectively. Since tripartite…
Advantage of Quantum Theory Over Non-classical Models of Communication
Sutapa Saha, Some Sankar Bhattacharya, Tamal Guha +2
Quantum correlations provide dramatic advantage over the corresponding classical resources in several communication tasks. However a broad class of probabilistic theories exists th…
Analytical construction of non local operator for n-qubit Dicke state
Sutapa Saha, Some Sankar Bhattacharya, Arup Roy +2
Entanglement in multipartite quantum systems is much more elusive than its bipartite counterpart. In recent past the usefulness of multipartite entangled states in several informat…