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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…
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…
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 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…
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…
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…
Auxiliary-assisted energy distillation from quantum batteries
Paranjoy Chaki, Aparajita Bhattacharyya, Kornikar Sen +1
We discuss the idea of extracting energy from a quantum battery, applying a projective measurement on an auxiliary system. The battery is initially connected to the auxiliary syste…
Noncompletely Positive Quantum Maps Enable Efficient Local Energy Extraction in Batteries
Aparajita Bhattacharyya, Kornikar Sen, Ujjwal Sen
Energy extraction from quantum batteries by means of completely positive trace-preserving (CPTP) maps leads to the concept of CPTP-local passive states, which identify bipartite st…
Transient effects in quantum refrigerators with finite environments
Aparajita Bhattacharyya, Ahana Ghoshal, Ujjwal Sen
We explore a small quantum refrigerator consisting of three qubits, each of which is kept in contact with an environment. We consider two settings: one is when there is necessarily…
Enhancing precision of atomic clocks by tuning disorder in accessories
Aparajita Bhattacharyya, Ahana Ghoshal, Ujjwal Sen
We find that a quantum device having an accessory involving precision measurement can have an enhancement of its metrological precision in estimating an unknown parameter of the qu…
Restoring metrological quantum advantage of measurement precision in noisy scenario
Aparajita Bhattacharyya, Ahana Ghoshal, Ujjwal Sen
We show that in presence of a local and uncorrelated dephasing noise, quantum advantage can be obtained in the Fisher information-based lower bound of the minimum uncertainty in es…
Correlation between resource-generating capacities of quantum gates
Aparajita Bhattacharyya, Ahana Ghoshal, Ujjwal Sen
We analyze the optimal basis for generating the maximum relative entropy of quantum coherence by an arbitrary gate on a two-qubit system. The optimal basis is not unique, and the h…