Related papers: Telecom-compatible cross-band quantum memory via dual photon modes dark-state polaritons

Telecom-compatible cross-band quantum memory via dual photon modes dark-state polaritons

URL: http://arxiv.org/abs/2510.11585v1
Date: Mon, 13 Oct 2025 16:29:18 GMT
Title: Telecom-compatible cross-band quantum memory via dual photon modes dark-state polaritons
Authors: Dounan Du, Eden Figueroa,
Abstract summary: Quantum memories are essential components of quantum networks, enabling synchronization, quantum repeaters, and long-distance entanglement distribution.<n>Most ensemble-based realizations rely on dark-state polaritons in near-infrared wavelengths, such as 795 nm in $87$Rb, far from the telecom band where long fiber transmission is optimal.<n>Here we identify a DSP in $87$Rb that coherently couples two photonic modes at 795 nm and 1324 nm through a shared spin-wave coherence.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum memories are essential components of quantum networks, enabling synchronization, quantum repeaters, and long-distance entanglement distribution. Most ensemble-based realizations rely on dark-state polaritons (DSPs) in $\Lambda$-type systems that operate at near-infrared wavelengths, such as 795 nm in $^{87}$Rb, far from the telecom band where long fiber transmission is optimal. Here we identify a DSP in $^{87}$Rb that coherently couples two photonic modes at 795 nm and 1324 nm through a shared spin-wave coherence. We derive its field operator and group velocity, extending the Fleischhauer-Lukin model to a dual-wavelength regime, and formulate a memory protocol enabling bidirectional storage and retrieval between the two modes. Numerical simulations of the full six-level dynamics confirm two-way storage and retrieval for both same-mode and cross-mode operation between the two wavelengths. The results demonstrate a dual-wavelength memory that unifies node-band and telecom-band operation within a single ensemble, providing a potential route toward frequency-conversion-free quantum-network interfaces.

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