Sisyphus effects in a microwave-excited flux-qubit resonator system

Sisyphus amplification, familiar from quantum optics, has recently been reported as a mechanism to explain the enhanced quality factor of a classical resonant (tank) circuit coupled to a superconducting flux qubit. Here we present data from a coupled system, comprising a quantum mechanical rf SQUID...

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Bibliographic Details
Published in:Physical review letters 2010-12, Vol.105 (25), p.257002-257002, Article 257002
Main Authors: Skinner, J C, Prance, H, Stiffell, P B, Prance, R J
Format: Article
Language:English
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Summary:Sisyphus amplification, familiar from quantum optics, has recently been reported as a mechanism to explain the enhanced quality factor of a classical resonant (tank) circuit coupled to a superconducting flux qubit. Here we present data from a coupled system, comprising a quantum mechanical rf SQUID (flux qubit) reactively monitored by an ultrahigh quality factor noise driven rf resonator and excited by microwaves. The system exhibits enhancement of the tank-circuit resonance, bringing it significantly closer (within 1%) to the lasing limit, than previously reported results.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.257002