160 citations · 1.2k across the 91 of their papers we have counts for
94 papers
On the structure of low-rank PPT entangled states violating Peres conjecture
Gurvir Singh, Manik Banik
Bound-entangled states with positive partial transpose (PPT) can exhibit quantum steering and Bell nonlocality, disproving the long-standing Peres conjecture and its stronger steer…
All-vs-Nothing Operational Manifestation of Preparation Contextuality
Jayashree Karmakar, Rafiuddin Gazi, Biswadeep Chatterjee +4
Preparation contextuality is often manifested operationally through a quantitative advantage over preparation-noncontextual models in information-processing tasks, yet quantum theo…
On the Origin of Beyond-Classical Advantage in the Parity-Permutation Problem
Jayashree Karmakar, Biswadeep Chatterjee, Rafiuddin Gazi +6
We investigate the task of identifying the parity (odd vs even) of an unknown permutation applied to particles. Classically, using fewer than distinct labels per particle l…
Exponential Advantage of Multipartite Entanglement over Quantum Communication with Applications to Bounded-Storage Cryptography
Ananya Chakraborty, Manik Banik, Ronald de Wolf
We establish an exponential communication advantage enabled by multipartite quantum entanglement. Building on the bipartite Hidden Matching problem, we introduce a communication ta…
Emergence and Recovery of (logical) Kochen-Specker Contextuality via Hamilton Extension
Jayashree Karmakar, Biswadeep Chatterjee, Rafiuddin Gazi +5
Logical Kochen-Specker (KS) contextuality is widely regarded as an intrinsic property of specially constructed measurement configurations. We show instead that it can emerge from K…
Conclusive Identification Via Noisy Classical Channel: Superactivation and Quantum Advantage
Anushko Chattopadhyay, Ambuj, Rakesh Das +4
We introduce conclusive identification task for classical channels: a receiver identifies transmitted inputs without error when possible, and responds inconclusively when outputs a…
No Absolute Hierarchy of Quantum Complementarity
Kunika Agarwal, Sahil Gopalkrishna Naik, Ananya Chakraborty +4
Bohr's principle of complementarity, prohibiting simultaneous access to certain physical properties within a single experimental arrangement, is considered to be a defining feature…
Thermodynamic Probes of Multipartite Entanglement in Strongly Interacting Quantum Systems
Harsh Sharma, Sampriti Saha, A. S. Majumdar +2
Quantifying multipartite entanglement in quantum many-body systems and hybrid quantum computing architectures is a fundamental yet challenging task. In recent years, thermodynamic…
Photonic Simulation of Beyond-Quantum Nonlocal Correlations (e.g. Popescu-Rohrlich Box) with Non-Signaling Quantum Resources
Kunal Shukla, Anirudh Verma, Kanad Sengupta +3
Bell nonlocality exemplifies the most profound departure of quantum theory from classical realism. Yet, the extent of nonlocality in quantum theory is intrinsically bounded, fallin…
Gottesman-Knill Limit on One-way Communication Complexity: Tracing the Quantum Advantage down to Magic Resources
Snehasish Roy Chowdhury, Sahil Gopalkrishna Naik, Ananya Chakraborty +5
Quantum systems are known to offer advantages over their classical counterpart in communication complexity protocols, where the aim is to minimize the amount of information exchang…
Quantum Incompatibility in Parallel vs Antiparallel Spins
Ram Krishna Patra, Kunika Agarwal, Biswajit Paul +3
We explore the joint measurability of incompatible qubit observables on ensembles of parallel and antiparallel spin-1/2 pairs. In parallel configuration, both spins are prepared in…
No-Go Theorem for Generic Simulation of Qubit Channels with Finite Classical Resources
Sahil Gopalkrishna Naik, Mani Zartab, Nicolas Gisin +1
The mathematical framework of quantum theory, though fundamentally distinct from classical physics, raises the question of whether quantum processes can be efficiently simulated us…
Nonlocality-Assisted Enhancement of Error-Free Communication in Noisy Classical Channels
Kunika Agarwal, Sahil Gopalkrishna Naik, Ananya Chakraborty +5
The zero-error capacity of a noisy classical channel quantifies its ability to transmit information with absolute certainty, i.e., without any error. Unlike Shannon's standard chan…
Stronger Nonlocality in GHZ States: A Step Beyond the Conventional GHZ Paradox
Ananya Chakraborty, Kunika Agarwal, Sahil Gopalkrishna Naik +1
The Greenberger-Horne-Zeilinger (GHZ) paradox, involving quantum systems with three or more subsystems, offers an 'all-vs-nothing' test of quantum nonlocality. Unlike Bell tests fo…
Scalable & Noise-Robust Communication Advantage of Multipartite Quantum Entanglement
Ananya Chakraborty, Ram Krishna Patra, Kunika Agarwal +4
Distributed computing, involving multiple servers collaborating on designated computations, faces a critical challenge in optimizing inter-server communication -- an issue central…
Harnessing Causal Indefiniteness for Accessing Locally Inaccessible Data
Sahil Gopalkrishna Naik, Samrat Sen, Ram Krishna Patra +4
Recent studies suggest that physical theories can exhibit indefinite causal structures, where the causal order of events is fundamentally undefined yet logically consistent. Beyond…
Ergodiscord: An Operational and Distinct Notion of Quantumness of Correlations
Mir Alimuddin, Snehasish Roy Chowdhury, Ram Krishna Patra +4
Nonclassicality in composite quantum systems depicts several puzzling manifestations, with Einstein-Podolsky-Rosen entanglement, Schrödinger steering, and Bell nonlocality being th…
Asymptotic Birkhoff-Violation in Operational Theories: Thermodynamic Implications and Information Processing
Ananya Chakraborty, Sahil Gopalkrishna Naik, Samrat Sen +4
In accordance with the entropy principle of thermodynamics, under spontaneous evolutions, physical systems always evolve towards states with equal or greater randomness. But, where…
Quantum Advantage: A Single Qubit's Experimental Edge in Classical Data Storage
Chen Ding, Edwin Peter Lobo, Mir Alimuddin +5
We implement an experiment on a photonic quantum processor establishing efficacy of the elementary quantum system in classical information storage. The advantage is established by…
When Mei-Gu Guan's 1960 Postmen Get Empowered with Bell's 1964 Nonlocal Correlations, or, Nonlocal Advantage in Vehicle Routing Problem
Abhishek Banerjee, Pratapaditya Bej, Amit Mukherjee +3
Vehicle routing problems, a comprehensive problem category originated from the seminal Chinese Postman Problem (first investigated by Chinese mathematician Mei-Gu Guan), entail str…
Quantum Nonlocality: Multi-copy Resource Inter-convertibility & Their Asymptotic Inequivalence
Subhendu B. Ghosh, Snehasish Roy Chowdhury, Guruprasad Kar +3
Quantum nonlocality, pioneered in Bell's seminal work and subsequently verified through a series of experiments, has drawn substantial attention due to its practical applications i…
Overcoming Traditional No-Go Theorems: Quantum Advantage in Multiple Access Channels
Ananya Chakraborty, Sahil Gopalkrishna Naik, Edwin Peter Lobo +5
Extension of point-to-point communication model to the realm of multi-node configurations finds a plethora of applications in internet and telecommunication networks. Here, we esta…
One-time Pad Encryption Model for Non-local Correlations
Govind Lal Sidhardh, Manik Banik
We present a cryptographic-inspired framework for modeling Bell nonlocal correlations. Drawing inspiration from the renowned De Broglie-Bohm theory, we conceptualize nonlocal boxes…
Experimental Verification of Many-Body Entanglement Using Thermodynamic Quantities
Jitendra Joshi, Mir Alimuddin, T S Mahesh +1
The phenomenon of quantum entanglement underlies several important protocols that enable emerging quantum technologies. Entangled states, however, are extremely delicate and often…