Single-qubit lasing in the strong-coupling regime

André, Stephan and Jin, Pei Qing and Brosco, Valentina and Cole, Jared H. and Romito, Alessandro and Shnirman, Alexander and Schön, Gerd (2010) Single-qubit lasing in the strong-coupling regime. Physical Review A - Atomic, Molecular, and Optical Physics, 82 (5). ISSN 1050-2947

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Abstract

Motivated by recent "circuit QED" experiments we study the lasing transition and spectral properties of single-qubit lasers. In the strong coupling, low-temperature regime, quantum fluctuations dominate over thermal noise and strongly influence the linewidth of the laser. When the qubit and the resonator are detuned, amplitude and phase fluctuations of the radiation field are coupled and the phase diffusion model, commonly used to describe conventional lasers, fails. We predict pronounced effects near the lasing transition, with an enhanced linewidth and nonexponential decay of the correlation functions. We cover a wide range of parameters by using two complementary approaches, one based on the Liouville equation in a Fock-state basis, covering arbitrarily strong coupling but limited to low photon numbers, the other based on the coherent-state representation, covering large photon numbers but restricted to weak or intermediate coupling.

Item Type: Journal Article
Journal or Publication Title: Physical Review A - Atomic, Molecular, and Optical Physics
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 139251
Deposited By: ep_importer_pure
Deposited On: 02 Dec 2019 11:50
Refereed?: Yes
Published?: Published
Last Modified: 29 Jan 2020 05:45
URI: https://eprints.lancs.ac.uk/id/eprint/139251

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