High-Fidelity, Weak-Light Polarization Gate Using Room-Temperature Atomic Vapor

23rd International Laser Physics Workshop

Deng, L.^1 ; Hagley, E.W.^1 ; Li, Runbing^2,3 ; Zhu, Chengjie^4

National Institute of Standards and Technology, Gaithersburg

MD

20899, United States^1

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan

430071, China^2

Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan

430071, China^3

School of Physics and Engineering, Tongji University, Shanghai 200092, China^4

关键词: Circularly polarized;    Controlled polarization;    Gate operation;    Hollow core fiber;    Linear polarization;    Linearly polarized;    Phase shift techniques;    Warm rubidium vapors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012046/pdf
DOI  :  10.1088/1742-6596/594/1/012046

来源: IOP

【 摘 要 】

Using a polarization-selective-Kerr-phase-shift technique we demonstrate a fast, all-optical, high-fidelity polarization gate in a room-temperature atomic medium. By writing a π-phase shift to one selected circularly-polarized component of a linearly-polarized input signal field and by equalizing the gain of both circularly-polarized components we can maintain the original strength of the signal field and yet achieve a perfect 90° rotation of its linear polarization, demonstrating a fast, high-fidelity, dynamically-controlled polarization gate operation. The orthogonal linear polarization switching field intensity can be as low as 2 mW/cm2using a warm rubidium vapor, which is equivalent to a 100-nanosecond pulse containing about 200 photons and confined in a typical commercial photonic hollow-core fiber with a 5-μm mode diameter.