



01259nas a2200157   4500008004100000245007100041210006900112260001400181520077600195100001300971700001700984700001601001700002501017700002201042856003701064       2020                        eng d00aOptical quantum memory with optically inaccessible noble-gas spins0 aOptical quantum memory with optically inaccessible noblegas spin  c7/17/20203 a<p>Optical quantum memories, which store and preserve the quantum state of photons, rely on a coherent mapping of the photonic state onto matter states that are optically accessible. Here we outline a new physical mechanism to map the state of photons onto the long-lived but optically inaccessible collective state of noble-gas spins. The mapping employs the coherent spin-exchange interaction arising from random collisions with alkali vapor. We analyze optimal strategies for high-efficiency storage and retrieval of non-classical light at various parameter regimes. Based on these strategies, we identify feasible experimental conditions for realizing efficient quantum memories with noble-gas spins having hours-long coherence times at room temperature and above</p>1 aKatz, Or1 aReches, Eran1 aShaham, Roy1 aGorshkov, Alexey, V.1 aFirstenberg, Ofer  uhttps://arxiv.org/abs/2007.08770