© 2014 AIP Publishing LLC. We demonstrate that Bulk Acoustic Wave (BAW) quartz resonator cooled down to millikelvin temperatures are excellent building blocks for hybrid quantum systems with extremely long coherence times. Two overtones of the longitudinal mode at frequencies of 15.6 and 65.4 MHz demonstrate a maximum f.Q product of 7.8×1016 Hz. With this result, the Q-factor in such devices near the quantum ground state can be four orders of magnitude better than previously attained in other mechanical systems. Tested quartz resonators possess the ultra low acoustic losses crucial for electromagnetic cooling to the phonon ground state.
|Title of host publication||Eleventh International Conference on Quantum Communication, Measurement and Computation (QCMC)|
|Publication status||Published - 2014|
|Event||Extremely high Q-factor mechanical modes in quartz bulk acoustic wave resonators at millikelvin temperature - Vienna, Austria|
Duration: 1 Jan 2014 → …
|Conference||Extremely high Q-factor mechanical modes in quartz bulk acoustic wave resonators at millikelvin temperature|
|Period||1/01/14 → …|