3 papers
quant-ph2026
Optimal observables for quantum-enhanced sensing and applications in a Floquet time crystal sensor
M. A. Manya, Andrei Tsypilnikov, Fernando Iemini
In this work, we discuss how to determine and implement feasible optimal observables for a metrology protocol that saturates the quantum Fisher information (QFI) bound. In particul…
quant-ph2026
Sensing ac fields with quantum many-body scars
Matheus Fibger, Andrei Tsypilnikov, Thiago R. de Oliveira +1
Quantum many-body scars (MBS) exhibit weak ergodicity breaking and long-lived coherent dynamics within an otherwise thermal spectrum. We investigate their metrological properties u…
quant-ph2026
Exact analysis of AC sensors based on Floquet time crystals
Andrei Tsypilnikov, Matheus Fibger, Fernando Iemini
We discuss the behavior of general Floquet time crystals (FTCs), including prethermal ones, in closed systems acting as AC sensors. We provide an analytical treatment of their quan…