Phase diffusion and locking in single-qubit lasers

Details Phase diffusion and locking in single-qubit lasers Phase diffusion and locking in single-qubit lasers

2008-07-29

arxiv.org/abs/0807.4607v3

Phys. Rev. A 79, 053848 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revised version with a new section about the validity of the model when applied to describe experiments

Scientific paper

10.1103/PhysRevA.79.053848

Motivated by recent experiments, which demonstrated lasing and cooling of the electromagnetic field in an electrical resonator coupled to a superconducting qubit, we study the phase coherence and diffusion of the system in the lasing state. We also discuss phase locking and synchronization induced by an additional {\sl ac} driving of the resonator. We extend earlier work to account for the strong qubit-resonator coupling and to include the effects of low-frequency qubit's noise. We show that the strong coupling may lead to a double peak structure of the spectrum, while the shape and width are determined to the low-frequency noise.

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