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Using on-demand coherence conversion via optical locking in conventionalstimulated (three-pulse) photon echoes, ultralong, ultraefficient photonstorage has been observed in a rare-earth Pr3+ doped Y2SiO5, where storage timeis several orders of magnitude longer and retrieval efficiency is enhanced byfifty times. Compared with the same method applied to two-pulse photon echoesfor a rephasing halt, use of spectral grating in the stimulated photon echoesoffers a phase-independent coherence conversion between optical and spinstates. Eventually an ultralong spin population decay-dependent photon storageprotocol is achieved by applying optical locking to a spectral grating inconventional stimulated photon echoes. The present breakthrough in both photonstorage time and retrieval efficiency opens a door to long-distance quantumcommunications utilizing quantum repeaters.

On-demand control of photon echoes far exceeding the spin coherence constraint via coherence swapping between optical and spin transitions