Single-qubit lasing in the strong-coupling regime

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.053802· OSTI ID:21528718

Andre, Stephan; Schoen, Gerd ^[1]; Jin, Pei-Qing; Cole, Jared H ^[1]; Brosco, Valentina ^[1]; Romito, Alessandro ^[1]; Shnirman, Alexander ^[2]

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1. Institut fuer Theoretische Festkoerperphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany)
2. DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany)

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.

• OSTI ID: 21528718
• Journal Information: Physical Review. A, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevA.82.053802; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
BOLTZMANN-VLASOV EQUATION
CORRELATION FUNCTIONS
DECAY
DIFFUSION
FLUCTUATIONS
INTERMEDIATE COUPLING
PHOTONS
QUANTUM ELECTRODYNAMICS
RESONATORS
STRONG-COUPLING MODEL
TEMPERATURE RANGE 0065-0273 K
BOSONS
COUPLING
DIFFERENTIAL EQUATIONS
ELECTRODYNAMICS
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
EQUATIONS
EQUIPMENT
FIELD THEORIES
FUNCTIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
TEMPERATURE RANGE
VARIATIONS