Russian Quantum Center, 100 Novaya St., Skolkovo, Moscow, Russia, 143025.
Department of Theoretical Physics, Moscow State Pedagogical University, M. Pirogovskaya Street 29, Moscow, Russia, 119991.
Nat Commun. 2018 Sep 10;9(1):3672. doi: 10.1038/s41467-018-06055-x.
Light is an irreplaceable means of communication among various quantum information processing and storage devices. Due to their different physical nature, some of these devices couple more strongly to discrete, and some to continuous degrees of freedom of a quantum optical wave. It is therefore desirable to develop a technological capability to interconvert quantum information encoded in these degrees of freedom. Here we generate and characterize an entangled state between a dual-rail (polarization-encoded) single-photon qubit and a qubit encoded as a superposition of opposite-amplitude coherent states. We furthermore demonstrate the application of this state as a resource for the interfacing of quantum information between these encodings. In particular, we show teleportation of a polarization qubit onto a freely propagating continuous-variable qubit.
光是各种量子信息处理和存储设备之间不可替代的通信手段。由于它们的物理性质不同，其中一些设备与离散自由度的耦合更强，而另一些设备则与量子光场的连续自由度耦合更强。因此，需要开发一种技术能力，以便在这些自由度中转换编码的量子信息。在这里，我们生成并描述了一种纠缠态，该纠缠态由双轨（偏振编码）单光子量子比特和一个编码为相反幅度相干态叠加的量子比特组成。我们进一步展示了该态作为这些编码之间量子信息接口的资源的应用。具体来说，我们展示了将偏振量子比特传送到自由传播的连续变量量子比特上的过程。
