Long-lived telecom-heralded single-photon storage in an absorptive spin-rephased quantum memory

• URL: http://arxiv.org/abs/2609.02579v1
• Date: Wed, 02 Sep 2026 13:23:53 GMT
• Title: Long-lived telecom-heralded single-photon storage in an absorptive spin-rephased quantum memory
• Abstract summary: We show non-classical storage of single photons in a Pr$3+$:Y$$SiO$_5$ rare-earth ion doped quantum memory.<n>We then demonstrate non-classical correlations between heralding photons and stored signal photons.<n>Together with the capacity of Pr$3+$:Y$$$SiO$_5$s, this result represents a significant step towards scalable long-distance quantum repeater links.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Long-lived storage of single photons under the form of atomic excitations is at the foundation of long-distance entanglement distribution in quantum networks. To mitigate decoherence effects induced by the environment, rephasing of the hyperfine coherences using microwave pulses have been implemented in a variety of single-emitter and ensemble-based solid-state systems. However, the demonstration of storage of single photons in an absorptive quantum memory including such spin rephasing mechanism remains elusive. In this work, we show non-classical storage of telecom-heralded single photons in a Pr$^{3+}$:Y$_2$SiO$_5$ rare-earth ion doped crystal quantum memory using the atomic frequency comb (AFC) spin-wave protocol combined with a XY4 spin rephasing sequence. Long-lived AFC photon echoes are first observed in the classical regime for storage times of up to approximately 3 ms. We then demonstrate non-classical correlations between heralding photons and stored signal photons generated by a cavity-enhanced parametric photon-pair source for storage times of up to 180 $μ$s and with measured cross-correlation values as high as 4.6(4). Together with the capacity of Pr$^{3+}$:Y$_2$SiO$_5$ QMs to support highly efficient and multiplexed storage, this result represents a significant step towards scalable long-distance quantum repeater links.

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