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Updated: Jul 14, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
T字型巨大原子導波路量子電磁力学システムにおける制御可能な非可逆単一光子周波数変換
Abstract:
We propose a directional single-photon frequency converter based on a giant Λ-type atom coupled to a T-shaped waveguide. By controlling local coupling phases to engineer quantum interference, perfect directional frequency conversion is achieved without an engineered chiral waveguide structure. The multi-path interference of the giant atom, combined with local phase tuning, enables flexible control over photon transmission direction and frequency, supporting multiple directional conversion channels. In the Markovian limit, the cavity-mediated structure realizes two fully efficient directional channels, while under non-Markovian conditions, retardation effects open several distinct frequency conversion windows. This phase-controlled, multi-frequency directional architecture provides a versatile platform for frequency-multiplexed quantum routing and networking.
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