Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-22706-y
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Funding
- National Key R&D Program of China [2017YFA0304100]
- National Natural Science Foundation of China [11774331, 11774335, 11504362, 11821404, 11654002]
- Anhui Initiative in Quantum Information Technologies [AHY020100]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-SLH003]
- Science Foundation of the CAS [ZDRW-XH-2019-1]
- Fundamental Research Funds for the Central Universities [WK2470000026, WK2470000029]
- Youth Innovation Promotion Association CAS
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Photon loss in optical fibers hinders long-distance distribution of quantum information on the ground, and the complexity of quantum repeater schemes limits communication distance. Alternative solutions such as transportable quantum memory and quantum-memory-equipped satellites offer promise for global quantum communication.
Photon loss in optical fibers prevents long-distance distribution of quantum information on the ground. Quantum repeater is proposed to overcome this problem, but the communication distance is still limited so far because of the system complexity of the quantum repeater scheme. Alternative solutions include transportable quantum memory and quantum-memory-equipped satellites, where long-lived optical quantum memories are the key components to realize global quantum communication. However, the longest storage time of the optical memories demonstrated so far is approximately 1 minute. Here, by employing a zero-first-order-Zeeman magnetic field and dynamical decoupling to protect the spin coherence in a solid, we demonstrate coherent storage of light in an atomic frequency comb memory over 1 hour, leading to a promising future for large-scale quantum communication based on long-lived solid-state quantum memories. Quantum memories are key components for quantum communication, but current storage times are still too short. Here, the authors use the atomic frequency comb protocol in a zero-first-order-Zeeman field to coherently store an optical pulse for an hour in a cryogenically cooled rare-earth doped crystal.
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