High-Fidelity, Weak-Light Polarization Gate Using Room-Temperature Atomic Vapor
Lu Deng, Edward W. Hagley, Runbing Li, Chengjie Zhu
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 pi-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 degree 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/cm^2 using 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.
, Hagley, E.
, Li, R.
and Zhu, C.
High-Fidelity, Weak-Light Polarization Gate Using Room-Temperature Atomic Vapor, Journal of Physics: Conference Series, [online], https://doi.org/10.1088/1742-6596/594/1/012046
(Accessed December 6, 2023)