Optical quantum memory for noble-gas spins based on spin-exchange collisions

Abstract

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 and characterize schemes to map the state of photons onto long-lived but optically-inaccessible collective states of noble-gas spins. The mapping employs coherent spin-exchange interaction arising from random collisions with alkali vapor. We propose efficient storage strategies in two operating regimes and analyze their performance for several proposed experimental configurations.

O.K. and R.S. contributed equally

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• Nuclear Spin Squeezing Based on Spin-Exchange Collisions