High-Fidelity, Weak-Light Polarization Gate Using Room-Temperature Atomic Vapor. (18th March 2015)

• Record Type: Journal Article
• Authors: Deng, L; Hagley, E W; Li, Runbing; Zhu, Chengjie
• Is Part Of: Journal of physics. Number 594 (2015)
• Page Start: 012046
• Publication Date: 2015-03-18
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/594/1/012046
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: 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/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.