5 papers · 1 filter
Family of Exact and Inexact Quantum Speed Limits for Completely Positive and Trace-Preserving Dynamics
Abhay Srivastav, Vivek Pandey, Brij Mohan +1
Traditional quantum speed limits formulated in density matrix space are generally unattainable for a wide class of dynamics and it is difficult to characterize the fastest possible…
Unitality Conditions on Subsystems in Quantum Dynamics
Anumita Mukhopadhyay, Shibdas Roy, Arun Kumar Pati
It is known that non-unital noise such as the amplitude damping can sometimes increase quantum correlations, while unital noise such as the dephasing usually decreases quantum corr…
Breaking Quantum Key Distributions under Quantum Switch-Based Attack
Sumit Nandi, Biswaranjan Panda, Pankaj Agrawal +1
Quantum key distribution (QKD) enables secure key sharing between distant parties, with several protocols proven resilient against conventional eavesdropping strategies. Here, we i…
Stronger speed limit for observables: Tight bound for the capacity of entanglement, the modular Hamiltonian and the charging of a quantum battery
Divyansh Shrimali, Biswaranjan Panda, Arun Kumar Pati
How fast an observable can evolve in time is answered by so-called ``observable speed limit". Here, we prove a stronger version of the observable speed limit and show that the prev…
Quantum Speed limit on the production of quantumness of observables
Divyansh Shrimali, Swapnil Bhowmick, Arun Kumar Pati
Non-classical features of quantum systems can degrade when subjected to environment and noise. Here, we ask a fundamental question: What is the minimum amount of time it takes for…