Abstract
Robust, long-lived optical quantum memories are important components of many quantum information and communication protocols. We demonstrate coherent generation, storage, and retrieval of excitations on a long-lived spin transition via spontaneous Raman scattering in a rare-earth ion-doped crystal. We further study the time dynamics of the optical correlations in this system. This is the first demonstration of its kind in a solid and an enabling step toward realizing a solid-state quantum repeater.
Highlights
Robust quantum memories based on long-lived internal atomic states in optically dense ensembles are important for various quantum information applications, for long-distance quantum communication [1]
We demonstrate storage and retrieval of collective excitations on a long-lived spin transition in a rare-earth ion-doped crystal (REIC), which acts as a “frozen” atomic ensemble
The correlation between the time separated heralding and retrieved fields is a signature of generation, storage, and retrieval of collective excitations
Summary
Robust quantum memories based on long-lived internal atomic states in optically dense ensembles are important for various quantum information applications, for long-distance quantum communication [1]. REIC systems are promising for quantum memory applications and have been studied for nearly two decades in quantum optical information schemes [5, 6] They have all the benefits of solid-state materials and exhibit long hyperfine coherence times, demonstrated up to seconds and theoretically potentially much longer [7,8,9,10,11]. We label the optical fields correlated with generation and retrieval of collective excitations as heralding and retrieved, respectively This protocol has been demonstrated in many materials and can be used in implementations of single photon sources and quantum repeaters. The storage time can be as long as the coherence time of the |g → |s transition, up to 30 seconds in REIC [8, 9]
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