Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: TR: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)

TT 30.1: Vortrag

Mittwoch, 16. März 2011, 10:30–10:45, HSZ 03

Lasing without Inversion in Circuit Quantum Electrodynamics — •Michael Marthaler¹, Yasuhiro Utsumi², Dmitry Golubev³, Alexander Shnirman⁴, and Gerd Schön¹ — ¹Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²Department of Physics Engineering, Faculty of Engineering, Mie University 1577, Kurimamachiya-cho, Tsu, Mi-e, 514-8507, Japan — ³Institut für Nanotechnologie, Karlsruhe Institute of Technology,D-76021 Karlsruhe, Germany — ⁴Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology,D-76021 Karlsruhe, Germany

We study photon generation in a pumped qubit coupled to a transmission line oscillator under the influence of a dissipative electromagnetic environment. It has been demonstrated previously that if population inversion can be produced a lasing state is created in the oscillator. Further effects known from quantum electrodynamics (QED) have also been demonstrated in these circuit QED systems. Here we show that the circuit can also exhibit the effect of ``lasing without inversion''. This arises since the coupling to the dissipative environment favors photon creation as compared to annihilation, similar to the recoil effect which was predicted for atomic systems. While the recoil effect is very weak and so far elusive the effect predicted here should be readily observable.