9 papers · 1 filter
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…
Memory-assisted advantage for state transfer in disordered quantum many-body scar system
Paranjoy Chaki, Ujjwal Sen
We analyze how memory in disorder facilitates quantum communication in many-body scar systems. We consider three distinct types of disorder, viz., memoryful, and memoryless uniform…
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…
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.…
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…
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…