8 papers · 1 filter
Quantum resonance based encryption protocol with quantum kicked top
Sreeram PG, M. S. Santhanam
We propose a genuine quantum protocol for protecting user's data, either in a shared quantum computer or in a quantum communication system, that is not accessible even to the servi…
Probing Chaos and Criticality with Observational Entropy and Finite-Resolution Measurements
J. Bharathi Kannan, Sreeram PG, M. S. Santhanam
Coarse-grained measurements offer a scalable alternative to full state tomography for characterizing complex quantum dynamics. We show that observational entropy (OE), an informati…
Upper bounds on charging power and tangible advantage in quantum batteries
Sreeram PG, J. Bharathi Kannan, M. S. Santhanam
Quantum battery is expected to outperform its classical counterpart due to quantum effects. Usually, in a quantum battery made of cells, quantum advantage is demonstrated throu…
Probing the localization effects in Krylov basis
J. Bharathi Kannan, Sreeram PG, Sanku Paul +2
Krylov complexity (K-complexity) is a measure of quantum state complexity that minimizes wavefunction spreading across all the possible bases. It serves as a key indicator of opera…
Extreme Events of Quantum Walks on Graphs
Nisarg Vyas, M. S. Santhanam
Due to the unitary evolution, quantum walks display different dynamical features from that of classical random walks. In contrast to this expectation, in this work, we show that ex…
Dichotomy in the effect of chaos on ergotropy
Sreeram PG, J. Bharathi Kannan, S. Harshini Tekur +1
The maximum unitarily extractable work from a quantum system -- ergotropy -- is the basic principle behind quantum batteries, a rapidly emerging field. This work studies ergotropy…