Journal
PHYSICAL REVIEW X
Volume 5, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.5.041002
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Funding
- DARPA ORCHID program
- DARPA MESO program
- Institute for Quantum Information and Matter
- NSF Physics Frontiers Center
- Gordon and Betty Moore Foundation
- AFOSR through the Wiring Quantum Networks with Mechanical Transducers MURI program
- Kavli Nanoscience Institute at Caltech
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Using pulsed optical excitation and read-out along with single-phonon-counting techniques, we measure the transient backaction, heating, and damping dynamics of a nanoscale silicon optomechanical crystal cavity mounted in a dilution refrigerator at a base temperature of T-f approximate to 11 mK. In addition to observing a slow (approximately 740-ns) turn-on time for the optical-absorption-induced hot-phonon bath, we measure for the 5.6-GHz breathing acoustic mode of the cavity an initial phonon occupancy as low as < n > = 0.021 +/- 0.007 (mode temperature T-min approximate to 70 mK) and an intrinsic mechanical decay rate of gamma(0) = 328 +/- 14 Hz (Q(m) approximate to 1.7 x 10(7)). These measurements demonstrate the feasibility of using short pulsed measurements for a variety of quantum optomechanical applications despite the presence of steady-state optical heating.
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