3 citations · 12 across the 24 of their papers we have counts for
7 papers · 1 filter
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…