Li R B, Zhu C J, Deng L, Hagley E W
National Institute of Standard and Technology, Gaithersburg, Maryland USA 20899; State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.
National Institute of Standard and Technology, Gaithersburg, Maryland USA 20899; School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Phys Rev A. 2015 Oct;92(4). doi: 10.1103/PhysRevA.92.043838. Epub 2015 Oct 28.
We demonstrate an observation of zero to π continuously controllable cross-phase-modulation based on N-type electromagnetically induced transparency scheme in a room-temperature Rb vapor. We theoretically and experimentally show that the signal field acquires a π phase shift compared with the reference light in the presence of the phase-control field. Using the method of the optical Mach-Zehnder interferometer, we demonstrate that a zero to π continuously controllable phase gate can be built by modulating the phase-control field. In addition, our theoretical calculation agrees well with the experimental observation, and the results presented in this work hold the potential applications for the orthogonal polarization/vector gate in the quantum information processing.
我们展示了在室温铷蒸汽中基于N型电磁诱导透明方案实现从零到π连续可控交叉相位调制的观测结果。我们通过理论和实验表明，在存在相位控制场的情况下，信号场相对于参考光获得了π相移。利用光学马赫-曾德尔干涉仪方法，我们证明了通过调制相位控制场可以构建从零到π连续可控的相位门。此外，我们的理论计算与实验观测结果吻合良好，并且本工作中呈现的结果在量子信息处理中的正交极化/矢量门方面具有潜在应用。
