Quantum enhanced feedback cooling of a mechanical oscillator using nonclassical light

Clemens Schäfermeier, Hugo Kerdoncuff, Ulrich B. Hoff, Hao Fu, Alexander Huck, Jan Bilek, Glen I. Harris, Warwick P. Bowen, Tobias Gehring and Ulrik L. Andersen ()
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Clemens Schäfermeier: Technical University of Denmark
Hugo Kerdoncuff: Technical University of Denmark
Ulrich B. Hoff: Technical University of Denmark
Hao Fu: Technical University of Denmark
Alexander Huck: Technical University of Denmark
Jan Bilek: Technical University of Denmark
Glen I. Harris: Australian Centre of Excellence for Engineered Quantum Systems, University of Queensland
Warwick P. Bowen: Australian Centre of Excellence for Engineered Quantum Systems, University of Queensland
Tobias Gehring: Technical University of Denmark
Ulrik L. Andersen: Technical University of Denmark

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Laser cooling is a fundamental technique used in primary atomic frequency standards, quantum computers, quantum condensed matter physics and tests of fundamental physics, among other areas. It has been known since the early 1990s that laser cooling can, in principle, be improved by using squeezed light as an electromagnetic reservoir; while quantum feedback control using a squeezed light probe is also predicted to allow improved cooling. Here we show the implementation of quantum feedback control of a micro-mechanical oscillator using squeezed probe light. This allows quantum-enhanced feedback cooling with a measurement rate greater than it is possible with classical light, and a consequent reduction in the final oscillator temperature. Our results have significance for future applications in areas ranging from quantum information networks, to quantum-enhanced force and displacement measurements and fundamental tests of macroscopic quantum mechanics.

Date: 2016
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DOI: 10.1038/ncomms13628

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