Single-qubit lasing in the strong-coupling regime

Stephan André, Pei-Qing Jin, Valentina Brosco, Jared H. Cole, Alessandro Romito, Alexander Shnirman, and Gerd Schön
Phys. Rev. A 82, 053802 – Published 3 November 2010

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
4 More
  • Received 16 August 2010

DOI:https://doi.org/10.1103/PhysRevA.82.053802

©2010 American Physical Society

Authors & Affiliations

Stephan André1,2, Pei-Qing Jin1, Valentina Brosco1,3, Jared H. Cole1, Alessandro Romito1,4, Alexander Shnirman2,5, and Gerd Schön1,2

  • 1Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany
  • 2DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany
  • 3Dipartimento di Fisica, Università “La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy
  • 4Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195 Berlin, Germany
  • 5Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 82, Iss. 5 — November 2010

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×