3 citations · 12 across the 24 of their papers we have counts for
24 papers · 1 filter
Towards minimal conditions for ergotropy injection in open quantum systems
Deependra Singh, Debarupa Saha, Ujjwal Sen
Interactions between a quantum system and its environment can inject ergotropy into the system, raising the question of the minimal dimensionality and physical resources required f…
Remote predictability of quantum measurement outcomes
Chirag Srivastava, Aparajita Bhattacharyya, Sheikh Parvez Mandal +2
Predicting quantum measurement outcomes for a local observer makes sense before, but not after, the measurement. However, for a remote observer, predicting measurement outcomes eve…
Enhanced quantum state discrimination under general measurements with entanglement and nonorthogonality restrictions
Swati Choudhary, Aparajita Bhattacharyya, Ujjwal Sen
The minimum error probability for distinguishing between two quantum states is bounded by the Helstrom limit, derived under the assumption that measurement strategies are restricte…
Precision Enhancement in Transient Quantum Thermometry:Cold-Probe Bias and Its Removal
Debarupa Saha, Ujjwal Sen
We unveil a fundamental temperature bias in transient quantum thermometry under Markovian dynamics. For qubit probes evolving in a thermal Markovian environment, we prove that tran…
Non-positive measurements aren't beneficial in quantum metrology for unitary encoding, but can be for open schemes
Paranjoy Chaki, Debarupa Saha, Kornikar Sen +1
We investigate whether non-positive operator-valued measurements can be beneficial for quantum metrology. For unitary encoding, we show that non-positive measurements offer no adva…
Isocoherent Work Extraction from Quantum Batteries: Basis-Dependent Response
Shuva Mondal, Debarupa Saha, Ujjwal Sen
We identify a connection between quantum coherence and the maximum extractable work from a quantum battery, and to this end, we define the coherence-constrained maximal work (CCMW)…
Entanglement-Constrained Quantum Metrology: Rapid Low-Entanglement Gains, Tapered High-Level Growth
Debarupa Saha, Ujjwal Sen
It is a specific type of quantum correlated state that achieves optimal precision in parameterestimation under unitary encoding. We consider the potential experimental limitation o…
Quantum refrigerator embedded in spin-star environments: Scalings of temperature and refrigeration time
Sukrut Mondkar, Aparajita Bhattacharyya, Ujjwal Sen
We examine a quantum absorption refrigerator that comprises three qubits, each of which is connected with a separate spin-star environment, with the three qubit-bath units coupled…
Distributed Quantum Dense Coding Enhanced With Non-classical Routing
Pratham Hullamballi, Aparajita Bhattacharyya, Ujjwal Sen
We propose a distributed quantum dense coding protocol that uses a control system to superpose two dense coding processes, allowing us to simultaneously and coherently encode and n…
Non-Markovianity vs athermality: perturbation-enhanced information backflow
Anindita Sarkar, Debarupa Saha, Ujjwal Sen
Non-Markovianity and athermality are useful resources in quantum technologies, and it is therefore important to understand the relations between the two, for general quantum dynami…
Quantum transistors for heat flux in and out of working substance parts: harmonic vs transmon and Kerr environs
Deepika Bhargava, Paranjoy Chaki, Aparajita Bhattacharyya +1
Quantum thermal transistors have been widely studied in the context of three-qubit systems, where each qubit interacts separately with a Markovian harmonic bath. Markovianity is an…
Nonlinearity-assisted advantage for open Dicke-quantum batteries
Aparajita Bhattacharyya, Pratha Dongre, Ujjwal Sen
We analyze the performance of a quantum battery in terms of energy storage and energy extraction, assisted by nonlinearities in a Dicke quantum battery utilizing an open-system app…
Approximate second laws and energy extraction from quantum batteries
Debarupa Saha, Aparajita Bhattacharyya, Ujjwal Sen
Conservation of energy under thermal operations, \textbf{TO}, is ensured by commutation of the unitary generating such operations with the total Hamiltonian. However in realistic s…
Role of energy-invariant assistants in energy extraction from quantum batteries
Paranjoy Chaki, Aparajita Bhattacharyya, Kornikar Sen +1
We investigate the role of energy-invariant assistants in energy extraction from quantum batteries. To this end, for energy extraction, we restrict ourselves to unitaries that join…
Precision in estimating independent local fields: attainable bound and indispensability of genuine multiparty entanglement
Aparajita Bhattacharyya, Ujjwal Sen
Estimation of local quantum fields is a crucial aspect of quantum metrology applications, and often also forms the test-bed to analyze the utility of quantum resources, like entang…
Positive and non-positive measurements in energy distillation from quantum batteries
Paranjoy Chaki, Aparajita Bhattacharyya, Kornikar Sen +1
We investigate energy distillation from quantum batteries within the framework of generalized quantum measurements, including both positive operator-valued measurements (POVMs) and…
Quantum Heat Transformers
Arghya Maity, Paranjoy Chaki, Ahana Ghoshal +1
We propose a quantum heat transformer (QHT), a quantum thermodynamic device that modulates temperature gradients between two thermal junctions in quantum systems. Functionally, the…
Minimal-error quantum state discrimination versus robustness of entanglement:More indistinguishability with less entanglement
Debarupa Saha, Kornikar Sen, Chirag Srivastava +1
We relate the the distinguishability of quantum states with their robustness of the entanglement, where the robustness of any resource quantifies how tolerant it is to noise. In pa…
Quantum sensing of even- versus odd-body interactions
Aparajita Bhattacharyya, Debarupa Saha, Ujjwal Sen
We analyze the scaling of quantum Fisher information with the number of system particles in the limit of large number of particles, as a function of the number of parties interacti…
Measurement incompatibility at all remote parties do not always permit Bell nonlocality
Priya Ghosh, Chirag Srivastava, Swati Choudhary +1
Two important ingredients necessary for obtaining Bell nonlocal correlations between two spatially separated parties are an entangled state shared between them and an incompatible…
Kerr-type nonlinear baths enhance cooling in quantum refrigerators
Tanaya Ray, Sayan Mondal, Aparajita Bhattacharyya +3
We study the self-contained three-qubit quantum refrigerator, with a three-body interaction enabling cooling of the target qubit, in presence of baths composed of anharmonic quantu…
Harnessing energy extracted from heat engines to charge quantum batteries
Debarupa Saha, Aparajita Bhattacharyya, Kornikar Sen +1
We explore the performance of three- and two-stroke heat engines with a qutrit working substance in charging two-level quantum batteries. We first classify the heat engines into tw…
Temperature- and interaction-tweaked efficiency boost of finite-time robust quantum Otto engines
Debarupa Saha, Ahana Ghoshal, Ujjwal Sen
We demonstrate that under specific conditions, a finite-time quantum Otto engine, employing a spin-1/2 particle as the working substance, despite undergoing incomplete Otto cycles,…
Modified Landauer's principle: How much can the Maxwell's demon gain by using general system-environment quantum state?
Sayan Mondal, Aparajita Bhattacharyya, Ahana Ghoshal +1
The Landauer principle states that decrease in entropy of a system, inevitably leads to a dissipation of heat to the environment. This statement is usually established by consideri…