Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 31: Poster I: Devices, Quantum Dots and Quantum Wires

HL 31.1: Poster

Tuesday, March 23, 2010, 18:30–20:30, Poster D1

Quantum Electrodynamics on a Chip — •Peiqing Jin¹, Alessandro Romito¹, Jared Cole¹, Alexander Shnirman², and Gerd Schön¹ — ¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76131 Karlsruhe — ²Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76131 Karlsruhe

Circuit QED [1], where a superconducting qubit, playing the role of an artificial atom, is coupled to an on-chip superconducting resonator, provides novel methods for studying quantum optics in electrical circuits and for realizing elements for quantum computing. Recently, single qubit lasing and cooling were demonstrated in such a system [2].

We investigate extensions of the circuit QED concepts to situations where the electron spin of an ensemble of quantum dots is coupled to a microwave resonator. The total spin of the electrons in the ensemble can be controlled via a train of laser pulses, as shown in recent experiments [3]. We explore the possibilities offered by such a spin manipulation to achieve Sisyphus amplification and damping of the resonator.

Reference: [1] A. Wallraff, et al., Nature 431, 162 (2004) [2] M. Grajcar, et al., Nature Physics 4, 612 (2008) [3] A. Greilich, et al, Science 317, 1896 (2007)