论文标题
通过超弹力机械和光学模式腔启用的自旋式机械量子接口
A spin-optomechanical quantum interface enabled by an ultrasmall mechanical and optical mode volume cavity
论文作者
论文摘要
我们提出了钻石和电信光学模式的缺陷中心之间的连贯的机械接口。结合了旋转机械设备和光学机械晶体的最新发展,我们引入了1D钻石纳米膜,并带有机械和光学模式的嵌入式机械和电场浓缩器$ v_ \ mathrm {Mech}/λ_\ Mathrm {Mech}/λ_\ Mathrm {p}分别为10^{ - 3} $。通过将IV组空位放置在集中器中,我们证明了接近40 MHz的精确高自旋机械耦合率,同时保留了高声学耦合。从理论上讲,我们表明,在纠缠先驱方案中使用的这种设备可以在量子中继器之间提供高保真的钟形对。使用机械界面作为光学和自旋子系统之间的中介,我们能够直接使用电信光学器件,绕过旋转的天然波长要求。由于自旋从未在光学上激发或解决,因此我们不会遭受光谱扩散的影响,并且可以在较高的温度(高达40 K)下工作,仅受热损耗的限制。我们估计,基于这些指标,具有高自旋机械耦合的光学机械设备将是近期量子中继器的有用架构。
We propose a coherent mechanical interface between defect centers in diamond and telecom optical modes. Combining recent developments in spin-mechanical devices and optomechanical crystals, we introduce a 1D diamond nanobeam with embedded mechanical and electric field concentrator with mechanical and optical mode volumes $V_\mathrm{mech}/Λ_\mathrm{p}^3\sim 10^{-5}$ and $V_\mathrm{opt}/λ^3\sim 10^{-3} $, respectively. By placing a Group IV vacancy in the concentrator we demonstrate exquisitely high spin-mechanical coupling rates approaching 40 MHz, while retaining high acousto-optical couplings. We theoretically show that such a device, used in an entanglement heralding scheme, can provide high-fidelity Bell pairs between quantum repeaters. Using the mechanical interface as an intermediary between the optical and spin subsystems, we are able to directly use telecom optics, bypassing the native wavelength requirements of the spin. As the spin is never optically excited or addressed, we do not suffer from spectral diffusion and can operate at higher temperatures (up to 40 K), limited only by thermal losses. We estimate that based on these metrics, optomechanical devices with high spin-mechanical coupling will be a useful architecture for near-term quantum repeaters.