Cooling a mechanical resonator with nitrogen-vacancy centres using a room temperature excited state spin–strain interaction

E. R. MacQuarrie, M. Otten, S. K. Gray and G. D. Fuchs ()
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E. R. MacQuarrie: Cornell University
M. Otten: Cornell University
S. K. Gray: Center for Nanoscale Materials, Argonne National Laboratory
G. D. Fuchs: School of Applied and Engineering Physics, Cornell University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Cooling a mechanical resonator mode to a sub-thermal state has been a long-standing challenge in physics. This pursuit has recently found traction in the field of optomechanics in which a mechanical mode is coupled to an optical cavity. An alternate method is to couple the resonator to a well-controlled two-level system. Here we propose a protocol to dissipatively cool a room temperature mechanical resonator using a nitrogen-vacancy centre ensemble. The spin ensemble is coupled to the resonator through its orbitally-averaged excited state, which has a spin–strain interaction that has not been previously studied. We experimentally demonstrate that the spin–strain coupling in the excited state is 13.5±0.5 times stronger than the ground state spin–strain coupling. We then theoretically show that this interaction, combined with a high-density spin ensemble, enables the cooling of a mechanical resonator from room temperature to a fraction of its thermal phonon occupancy.

Date: 2017
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DOI: 10.1038/ncomms14358

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