Quantum analysis of a linear DC SQUID mechanical displacement detector

Details Quantum analysis of a linear DC SQUID mechanical displacement detector Quantum analysis of a linear DC SQUID mechanical displacement detector

2007-04-03

arxiv.org/abs/0704.0457v2

Physical Review B 76, 014511 (2007)

Physics

Condensed Matter

Superconductivity

33 pages, 4 figures, published version

Scientific paper

10.1103/PhysRevB.76.014511

We provide a quantum analysis of a DC SQUID mechanical displacement detector within the sub-critical Josephson current regime. A segment of the SQUID loop forms the mechanical resonator and motion of the latter is transduced inductively through changes in the flux threading the loop. Expressions are derived for the detector signal response and noise, which are used to evaluate the position and force detection sensitivity. We also investigate cooling of the mechanical resonator due to back reaction noise from the detector.

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