Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.

April 5, 2007
12:30 PM

Miles P. Blencowe,
Dartmouth College

Quantum Analysis of a DC SQUID Mechanical Displacement Detector

Abstract

We begin with a short overview of recent developments in quantum-limited displacement detection. As a representative example, we then provide a comprehensive analysis of a DC SQUID quantum-limited mechanical displacement detector. 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. Much of the presented analysis will be general to a broad class of quantum displacement detectors.