Trautmann N, Alber G, Agarwal G S, Leuchs G
Institut für Angewandte Physik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Phys Rev Lett. 2015 May 1;114(17):173601. doi: 10.1103/PhysRevLett.114.173601. Epub 2015 Apr 27.
Readout and retrieval processes are proposed for efficient, high-fidelity quantum state transfer between a matter qubit, encoded in the level structure of a single atom or ion, and a photonic qubit, encoded in a time-reversal-symmetric single-photon wave packet. They are based on controlling spontaneous photon emission and absorption of a matter qubit on demand in free space by stimulated Raman adiabatic passage. As these processes do not involve mode selection by high-finesse cavities or photon transport through optical fibers, they offer interesting perspectives as basic building blocks for free-space quantum-communication protocols.
本文提出了读出和检索过程，以实现高效、高保真的量子态转移，该转移发生在由单个原子或离子的能级结构编码的物质量子比特与由时间反演对称单光子波包编码的光子量子比特之间。它们基于通过受激拉曼绝热通道在自由空间中按需控制物质量子比特的自发光子发射和吸收。由于这些过程不涉及通过高精细度腔进行模式选择或通过光纤进行光子传输，因此作为自由空间量子通信协议的基本构建模块，它们提供了有趣的前景。
