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Phononic bandgap nano-acoustic cavity with ultralong phonon lifetime

zqyin 添加于 2019-1-15 10:47 | 1206 次阅读 | 0 个评论

作者
MacCabe GS, Ren H, Luo J, Cohen JD, Zhou H, Sipahigil A, Mirhosseini M, Painter O
摘要
We present measurements at millikelvin temperatures of the microwave-frequency acoustic properties of a crystalline silicon nanobeam cavity incorporating a phononic bandgap clamping structure for acoustic confinement. Utilizing pulsed laser light to excite a co-localized optical mode of the nanobeam cavity, we measure the dynamics of cavity acoustic modes with single-phonon sensitivity. Energy ringdown measurements for the fundamental $5$~GHz acoustic mode of the cavity shows an exponential increase in phonon lifetime versus number of periods in the phononic bandgap shield, increasing up to $tau approx 1.5$~seconds. This ultralong lifetime, corresponding to an effective phonon propagation length of several kilometers, is found to be consistent with damping from non-resonant two-level system defects on the surface of the silicon device. Potential applications of these ultra-coherent nanoscale mechanical resonators range from tests of various collapse models of quantum mechanics to miniature quantum memory elements in hybrid superconducting quantum circuits.
详细资料
- 关键词: quant-ph
- 文献种类:手稿
- 期卷页: 2019年
- 日期: 2019-1-14
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/1901.04129v1
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