Dynamic rephasing in a telecom warm vapor quantum memory

• URL: http://arxiv.org/abs/2604.13900v1
• Date: Wed, 15 Apr 2026 14:11:44 GMT
• Title: Dynamic rephasing in a telecom warm vapor quantum memory
• Abstract summary: We introduce and experimentally demonstrate a protocol that counteracts Doppler dephasing in a telecom-band ORCA quantum memory.<n>We extend the storage time by a factor of 50 while preserving the memory's GHz bandwidth and low noise.<n>Our results establish rephasing in warm atomic vapors as a viable route toward high-bandwidth, temporally multiplexed quantum memories operating at room temperature.
• Score: 0.6868643002327817
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Off-Resonant Cascaded Absorption (ORCA) protocol in warm atomic vapors offers a scalable platform for high-bandwidth, low noise quantum memories, but its coherence time is fundamentally limited by Doppler-induced dephasing. We introduce and experimentally demonstrate a dynamic rephasing protocol that counteracts Doppler dephasing in a telecom-band ORCA quantum memory. By transferring the stored excitation to an auxiliary shelving state, we effectively reverse the accumulated Doppler phase and extend the storage time by a factor of 50 while preserving the memory's GHz bandwidth and low noise. Using this protocol, we then demonstrate on-demand storage and retrieval of four independent time-bin modes within a single warm vapor memory -- showing that Doppler dephasing can alternatively be harnessed for high-dimensional temporal mode processing. Our results establish rephasing in warm atomic vapors as a viable route toward high-bandwidth, temporally multiplexed quantum memories operating at room temperature.

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