Critical Quantum Metrology with a Finite-Component Quantum Phase Transition.

摘要: Physical systems close to a quantum phase transition exhibit divergent susceptibility, suggesting that an arbitrarily high precision may be achieved by exploiting critical as probes estimate physical parameter. However, such improvement in sensitivity is counterbalanced the closing of energy gap, which implies slowing down and inevitable growth protocol duration. Here, we design different metrological protocols exploit superradiant Rabi model, finite-component system composed single two-level atom interacting with bosonic mode. We show that, spite down, optical can achieve quantum-enhanced time scaling frequency-estimation protocols.