Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations

Understand

We investigate the sensing capacity of non-equilibrium dynamics in quantum systems exhibiting Bloch oscillations.

• By focusing on the resource efficiency of the probe, quantified by quantum Fisher information, we find different scaling behaviors in two different phases, namely localized and extended.
• Our results provide a quantitative ansatz for quantum Fisher information in terms of time, probe size, and the number of excitations.
• In the long-time regime, the quantum Fisher information is a quadratic function of time, touching the Heisenberg limit.