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Bulletin of the American Physical Society

Critical Slowing Down in Circuit QED

Giovanna Tancredi, Paul Brookes, Themis Mavrogordatos, Andrew Patterson, Joseph Rahamim, Eran Ginossar, Marzena Hanna Szymańska, Peter Leek

Published Mar 8, 2018• 0 citations
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The quantum Rabi model (QRM) with linear coupling between light mode and qubit exhibits the analog of a second-order phase transition for vanishing mode frequency which allows for criticality-enhanced quantum metrology in a few-body system. We show that the QRM including a nonlinear coupling term exhibits much higher measurement precisions due to its first-order-like phase transition at finite frequency, avoiding the detrimental slowing-down effect close to the critical point of the linear QRM. When a bias term is added to the Hamiltonian, the system can be used as a fluxmeter or magnetometer if implemented in circuit QED platforms.