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Critical Quantum metrology with a finite-component quantum phase transition by Garbe, Louis; Bina, Matteo; Keller, Arne; Paris, Matteo G. A.; Felicetti, Simone is a scholarly article available to read on EtoBox.

What is Critical Quantum metrology with a finite-component quantum phase transition about?

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

Author

Garbe, Louis; Bina, Matteo; Keller, Arne; Paris, Matteo G. A.; Felicetti, Simone

Published

2019

Language

EN