Optical dilution and feedback cooling of a gram-scale oscillator to 6.9 mK

Details Optical dilution and feedback cooling of a gram-scale oscillator to 6.9 mK Optical dilution and feedback cooling of a gram-scale oscillator to 6.9 mK

2007-05-08

arxiv.org/abs/0705.1018v2

Phys. Rev. Lett. 99, 160801 (2007)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.99.160801

We report on use of a radiation pressure induced restoring force, the optical spring effect, to optically dilute the mechanical damping of a 1 gram suspended mirror, which is then cooled by active feedback (cold damping). Optical dilution relaxes the limit on cooling imposed by mechanical losses, allowing the oscillator mode to reach a minimum temperature of 6.9 mK, a factor of ~40000 below the environmental temperature. A further advantage of the optical spring effect is that it can increase the number of oscillations before decoherence by several orders of magnitude. In the present experiment we infer an increase in the dynamical lifetime of the state by a factor of ~200.

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