Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-06-08
New Journal of Physics 10, 095018 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, written for the Focus Issue of New J. Phys. on "Mechanical Systems at the Quantum Limit", ed. by Markus Aspelmeyer an
Scientific paper
10.1088/1367-2630/10/9/095018
Superconducting qubits coupled to electric or nanomechanical resonators display effects previously studied in quantum electrodynamics (QED) and extensions thereof. Here we study a driven qubit coupled to a low-frequency tank circuit with particular emphasis on the role of dissipation. When the qubit is driven to perform Rabi oscillations, with Rabi frequency in resonance with the oscillator, the latter can be driven far from equilibrium. Blue detuned driving leads to a population inversion in the qubit and lasing behavior of the oscillator ("single-atom laser"). For red detuning the qubit cools the oscillator. This behavior persists at the symmetry point where the qubit-oscillator coupling is quadratic and decoherence effects are minimized. Here the system realizes a "single-atom-two-photon laser".
André Stephan
Brosco Valentina
Fedorov Arkady
Hauss Julian
Hutter Carsten
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