Matter-wave interferometry of a levitated thermal nano-oscillator induced and probed by a spin.
Matter-wave interferometry of a levitated thermal nano-oscillator induced and probed by a spin.
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DOI：
10.1103/physrevlett.111.180403
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发表时间：
2013-06
影响因子：
8.6
通讯作者：
M. Scala;M. Kim;Gavin W. Morley;P. Barker;S. Bose
中科院分区：
文献类型：
--
作者：
M. Scala;M. Kim;Gavin W. Morley;P. Barker;S. Bose
我们展示了如何空间分离的质心（c.m.）状态之间的干扰。介观谐振子可以通过将其耦合到自旋并单独进行自旋操纵和测量（拉姆齐干涉法）来证明。我们建议使用含有氮空位中心自旋的光学悬浮金刚石珠。微珠的纳米级尺寸使得由于悬浮引起的运动退相干可以忽略不计。自旋-运动耦合的形式确保该方案适用于热态，使得适度的反馈冷却足够。未单独控制或观察c.m.状态是必需的，因此可以省去腔、空间分辨检测和低质量色散系综。拉姆齐干涉测量中的可控相对相位源于引力势差，因此它唯一地证明了状态之间的相干性，这些状态涉及空间上不同位置的整个粒子。
We show how the interference between spatially separated states of the center of mass (c.m.) of a mesoscopic harmonic oscillator can be evidenced by coupling it to a spin and performing solely spin manipulations and measurements (Ramsey interferometry). We propose to use an optically levitated diamond bead containing a nitrogen-vacancy center spin. The nanoscale size of the bead makes the motional decoherence due to levitation negligible. The form of the spin-motion coupling ensures that the scheme works for thermal states so that moderate feedback cooling suffices. No separate control or observation of the c.m. state is required and thereby one dispenses with cavities, spatially resolved detection, and low-mass-dispersion ensembles. The controllable relative phase in the Ramsey interferometry stems from a gravitational potential difference so that it uniquely evidences coherence between states which involve the whole nanocrystal being in spatially distinct locations.