Towards an Hour-long Quantum Memory at Room Temperature via Random Collisions
1. Weizmann Institute of Science, Israel.
2. Rafael Ltd. Quantum Technologies Center, Israel.
Quantum optical memories allow storing and preserving the quantum state of photons via mapping to a long-lived state of matter. Spins of noble-gases, are a unique system that could exhibit hours-long coherence times at room temperature and above. However, these spins do not interact with light, thus hindering their practical use as optical memories.
Here we describe our work on realizing an interface between noble-gas spins and light, using alkali vapor as a mediator. We first developed a new scheme to store light onto alkali vapor, demonstrating a 400-millisecond storage lifetime, a record for an optical memory at room-temperature. We then studied the interface between alkali vapor and noble-gas spins, presenting a coherent interface that could actually be realized via random collisions. This interface could pave the way for quantum memories with noble-gas spins, which could demonstrate hours long storage lifetime and operate at room temperature and above.