Yao Wang, Liu Ren-Bao, Sham L J
Department of Physics, University of California-San Diego, La Jolla, CA 92093-0319, USA.
Phys Rev Lett. 2005 Jul 15;95(3):030504. doi: 10.1103/PhysRevLett.95.030504. Epub 2005 Jul 13.
A cavity coupling, a charged nanodot, and a fiber can act as a quantum interface, through which a stationary spin qubit and a flying photon qubit can be interconverted via a cavity-assisted Raman process. This Raman process can be made to generate or annihilate an arbitrarily shaped single-photon wave packet by pulse shaping the controlling laser field. This quantum interface forms the basis for many essential functions of a quantum network, including sending, receiving, transferring, swapping, and entangling qubits at distributed quantum nodes as well as a deterministic source and an efficient detector of a single-photon wave packet with arbitrarily specified shape and average photon number. Numerical study of errors from noise and system parameters on the operations shows high fidelity and robust tolerance.
腔耦合、带电纳米点和光纤可作为量子接口，通过该接口，静止自旋量子比特和飞行光子量子比特可经由腔辅助拉曼过程相互转换。通过对控制激光场进行脉冲整形，可使该拉曼过程产生或湮灭任意形状的单光子波包。该量子接口构成了量子网络许多基本功能的基础，包括在分布式量子节点处发送、接收、转移、交换和纠缠量子比特，以及作为具有任意指定形状和平均光子数的单光子波包的确定性源和高效探测器。对操作中噪声和系统参数产生的误差进行的数值研究显示出高保真度和强大的容错能力。
