Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)

TT 5.8: Talk

Monday, March 26, 2012, 11:30–11:45, BH 243

Lasing, trapping states, and multistability in circuit quantum electrodynamical analog of a single-atom injection maser — •Michael Marthaler¹, Juha Leppäkangas^1,2, and Jared Cole^1,3 — ¹Institut für Theoretische Festkörperphysik and DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²Applied Quantum Physics Laboratory, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden — ³Chemical and Quantum Physics, School of Applied Sciences, RMIT University, Melbourne 3001, Australia

We study a superconducting single-electron transistor (SSET) which is coupled to a LC oscillator via the phase difference across one of the Josephson junctions. This leads to a strongly anharmonic coupling between the SSET and the oscillator. The coupling can oscillate with the number of photons, which makes this system very similar to the single-atom injection maser. However, the advantage of a design based on superconducting circuits is the strong coupling and existence of standard methods to measure the radiation field in the oscillator. This makes it possible to study many effects that have been predicted for the single-atom injection maser in a circuit quantum electrodynamics setup.