Chen Jun, Altepeter Joseph B, Medic Milja, Lee Kim Fook, Gokden Burc, Hadfield Robert H, Nam Sae Woo, Kumar Prem
Center for Photonic Communication and Computing, EECS Department, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3118, USA.
Phys Rev Lett. 2008 Apr 4;100(13):133603. doi: 10.1103/PhysRevLett.100.133603.
We present the first quantum controlled-not (cnot) gate realized using a fiber-based indistinguishable photon-pair source in the 1.55 microm telecommunications band. Using this free-space cnot gate, all four Bell states are produced and fully characterized by performing quantum-state tomography, demonstrating the gate's unambiguous entangling capability and high fidelity. Telecom-band operation makes this cnot gate particularly suitable for quantum-information-processing tasks that are at the interface of quantum communication and linear optical quantum computing.
我们展示了首个使用基于光纤的1.55微米电信波段不可区分光子对源实现的量子控制非（CNOT）门。利用这个自由空间CNOT门，通过进行量子态层析成像产生并完全表征了所有四个贝尔态，证明了该门明确的纠缠能力和高保真度。电信波段运行使得这个CNOT门特别适用于处于量子通信和线性光学量子计算接口的量子信息处理任务。
