Lombardo Daniel, Twamley Jason
Opt Express. 2015 Feb 9;23(3):2945-61. doi: 10.1364/OE.23.002945.
The quantum coupling of spatially distant spins via optical photons using cavity quantum electrodynamic (cQED) methods has proved experimentally challenging due to the large spin-photon coupling strengths required. To achieve such coupling strengths using traditional cQED methods requires either individual spins and ultra-small cavities or an ensemble of identical spins coupled to larger cavities. In this work we describe a method to couple distant spins via the collective enhanced coupling to a large ensemble ∼ N, of degenerate optical Whispering Gallery Modes (WGM) in a spherical resonator where the spins are spatially located at the antipodes. The setup can be scaled-up to build 1D, 2D and 3D cQED lattices to enable quantum simulation or computing.
利用腔量子电动力学（cQED）方法通过光学光子实现空间上远距离自旋的量子耦合，由于所需的大自旋 - 光子耦合强度，在实验上已证明具有挑战性。使用传统的cQED方法要实现这样的耦合强度，要么需要单个自旋和超小腔，要么需要与较大腔耦合的相同自旋的系综。在这项工作中，我们描述了一种方法，通过集体增强耦合到球形谐振器中大量简并光学回音壁模式（WGM）的系综（约为N）来耦合远距离自旋，其中自旋在空间上位于对映点。该装置可以扩大规模以构建一维、二维和三维cQED晶格，以实现量子模拟或计算。
