2 citations · 3 across the 16 of their papers we have counts for
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Scaling vs entanglement in measurement-induced phase transition for non-integrable systems
Paranjoy Chaki, Protyush Nandi, Subinay Dasgupta +1
We find that the measurement-induced phase transition generated by deterministic global measurements, previously observed in the integrable transverse-field Ising model (TFIM), per…
Surpassing thermal-state limit in thermometry via non-completely positive quantum encoding
Anindita Sarkar, Paranjoy Chaki, Debarupa Saha +1
Conventional quantum thermometry assumes completely positive (CP) encoding maps, where the probe is initially uncorrelated with the environment. We consider realistic scenarios wit…
Entanglement concentration via measurement:- role of imaginarity
Indranil Biswas, Subrata Bera, Ujjwal Sen +2
The role of complex numbers in quantum theory extends beyond mathematical convenience, having recently been formalized as a resource under the framework of the resource theory of i…
Dynamical Quantum Phase Transitions in Boundary Time Crystals
Sukrut Mondkar, Priya Ghosh, Ujjwal Sen
We demonstrate the existence of a dynamical quantum phase transition (DQPT) in a dissipative collective-spin model that exhibits the boundary time crystal (BTC) phase. We initializ…
Role reversal in quantum Mpemba effect
Arunabha Das, Paranjoy Chaki, Priya Ghosh +1
We investigate the quantum Mpemba effect in a dissipative Dicke model, which consists of a spin-1/2 ensemble coupled to a bosonic mode, which in turn is coupled to a bosonic bath.…
Encoding parameters by measurement: Forgetting can be better in quantum metrology
Shuva Mondal, Priya Ghosh, Ujjwal Sen
We introduce quantum parameter estimation with the encoding being via a quantum measurement. We quantify the precision for estimating parameters characterizing a general two-outcom…
Comparing physical quantities with finite-precision: beyond standard metrology and an illustration for cooling in quantum processes
Anindita Sarkar, Paranjoy Chaki, Priya Ghosh +1
We propose a general framework to compare the values of a physical quantity pertaining to two - or more - physical setups, in the finite-precision scenario. Such a situation requir…
Optimal quantum precision in noise estimation: Is entanglement necessary?
Shuva Mondal, Priya Ghosh, Ujjwal Sen
We ask whether the optimal probe is entangled, and if so, what is its character and amount, for estimating the noise parameter of a large class of local quantum encoding processes…
Role of phase of optimal probe in noncommutativity vs coherence in quantum multiparameter estimation
Ritopriyo Pal, Priya Ghosh, Ahana Ghoshal +1
Quantum multiparameter estimation offers a framework for the simultaneous estimation of multiple parameters, pertaining to possibly noncommutating observables. While the optimal pr…
Unbounded entanglement-sustaining sequential local quantum state discrimination
Debarupa Saha, Priya Ghosh, Kornikar Sen +2
Two pure orthogonal quantum states can be perfectly distinguished by sequential local action of multiple pairs of parties. However, this process typically leads to the complete dis…
Fluctuation in energy extraction from quantum batteries: How open should the system be to control it?
Anindita Sarkar, Paranjoy Chaki, Priya Ghosh +1
We ask whether there exists a relation between controllability of the fluctuations in extractable energy of a quantum battery and (a) how open an arbitrary but fixed battery system…
Path superposition activating perfect quantum teleportation ability for separable states
Sayan Mondal, Priya Ghosh, Ujjwal Sen
Quantum teleportation is a quintessential quantum communication protocol that enables the transmission of an arbitrary quantum state between two distant parties without physically…
Disappearance of measurement-induced phase transition in a quantum spin system for large sizes
Paranjoy Chaki, Protyush Nandi, Ujjwal Sen +1
Measurement-induced phase transitions are often studied in random quantum circuits, with local measurements performed with a certain probability. We present here a model where a gl…
Resourcefulness vs indivisibility in quantum channels
Priya Ghosh, Soumyajit Pal, Ujjwal Sen
Open quantum dynamics can be categorized in several ways, including according to their divisibility. For any quantum channel acting for any finite time period, we propose measures…
Designing a Universal Quantum Switch for Arbitrary Quantum Dynamics
Priya Ghosh, Kornikar Sen, Ujjwal Sen
A quantum switch is a superoperator that, in general, creates a superposition of various causal orders of two or more quantum dynamics that are all divisible in the complete positi…
Detecting quantum properties in physical systems using proxy witnesses
Priya Ghosh, Ujjwal Sen, Siddhartha Das
In practice, it is quite challenging to detect a quantum property, a microscopic property, in a macroscopic system. In our work, we construct general proxy witnesses of quantum pro…
Dynamical Characterization of Quantum Coherence
Hai Wang, Ujjwal Sen
Quantum coherence, rooted in the superposition principle of quantum mechanics, is a crucial quantum resource. Various measures, operational interpretations, and generalizations of…