Phase diffusion and locking in single-qubit lasers

Abstract

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.

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

References in corpus (7)

• Coupling Superconducting Qubits via a Cavity Bus
• Resolving photon number states in a superconducting circuit
• Cooling a nanomechanical resonator with quantum back-action
• Single artificial-atom lasing
• Single-qubit lasing and cooling at the Rabi frequency
• Sisyphus cooling and amplification by a superconducting qubit
• Synchronization and bistability of qubit coupled to a driven dissipative oscillator

Cited by in corpus (1)

• Quantum synchronization and entanglement of two qubits coupled to a driven dissipative resonator