论文标题
腔外发在极化编码的量子网络中的影响
Effects of cavity birefringence in polarisation-encoded quantum networks
论文作者
论文摘要
通过单光子在遥远原子之间产生纠缠是网络量子计算的基础，这是通向大规模捕获的离子和被困原子处理器的有前途的途径。在光腔中定位发射极提供了有效的物质界面，但是镜面内的双向反射性在产生的光子的极化中引入了时间依赖性。我们表明，这种“极化振荡”效应可能会导致在两光子，极化编码的基于测量的远程纠缠方案的背景下严重丧失保真度。通过最小化镜像椭圆度来抑制源时的这些错误总是可取的，但是我们为无法实现的系统提出了两种补救措施。我们得出的结论是，即使是谦虚的腔体双折射也可能对远程纠缠性能有害，这可能会限制极性编码方案对大规模量子网络的适用性。
The generation of entanglement between distant atoms via single photons is the basis for networked quantum computing, a promising route to large-scale trapped-ion and trapped-atom processors. Locating the emitter within an optical cavity provides an efficient matter-light interface, but mirror-induced birefringence within the cavity introduces time-dependence to the polarisation of the photons produced. We show that such `polarisation oscillation' effects can lead to severe loss of fidelity in the context of two-photon, polarisation encoded measurement-based remote entanglement schemes. It is always preferable to suppress these errors at source by minimising mirror ellipticity, but we propose two remedies for systems where this cannot be achieved. We conclude that even modest cavity birefringence can be detrimental to remote entanglement performance, to an extent that may limit the suitability of polarisation-encoded schemes for large-scale quantum networks.
