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. 2016 Aug 9;7:12496. doi: 10.1038/ncomms12496

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Copyright © 2016, The Author(s)

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(a) Force sensitivity as a function of cavity pump photon population measured when pumping the cavity on the red sideband. (b) Imprecision force noise (turquoise) and thermal force noise (dark yellow) versus n_p. The data in a,b are fitted to equations (2), (6). (c) Product of the bath temperature T_bath and the intrinsic mechanical decay rate as a function of cavity pump photon occupation. The line is a fit to the data. (d) Effective spectral mechanical line width and energy decay as a function of n_p. The data are fitted to with δΓ_noise/2π=8.7 kHz (red line). (e–h) Equivalent to (a–d) but for device B. The lowest value for the force sensitivity in e is . In e and f the data are fitted with n_add=22 and in h we use g₀/2π=7.3 Hz, κ/2π=2.5 MHz and δΓ_noise/2π=0.145 kHz. All the measurements on device A are performed at V_g=3.002 V and on device B at V_g=0 V. The cryostat temperature is 15 mK.

Inline graphic — (a) Force sensitivity as a function of cavity pump photon population measured when pumping the cavity on the red sideband. (b) Imprecision force noise (turquoise) and thermal force noise (dark yellow) versus n_p. The data in a,b are fitted to equations (2), (6). (c) Product of the bath temperature T_bath and the intrinsic mechanical decay rate as a function of cavity pump photon occupation. The line is a fit to the data. (d) Effective spectral mechanical line width and energy decay as a function of n_p. The data are fitted to with δΓ_noise/2π=8.7 kHz (red line). (e–h) Equivalent to (a–d) but for device B. The lowest value for the force sensitivity in e is . In e and f the data are fitted with n_add=22 and in h we use g₀/2π=7.3 Hz, κ/2π=2.5 MHz and δΓ_noise/2π=0.145 kHz. All the measurements on device A are performed at V_g=3.002 V and on device B at V_g=0 V. The cryostat temperature is 15 mK.