Coherence rephasing combined with spin-wave storage using chirped control pulses

Demeter, Gábor (2014) Coherence rephasing combined with spin-wave storage using chirped control pulses. PHYSICAL REVIEW A, 89 (6). ISSN 2469-9926

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Abstract

Photon-echo based optical quantum memory schemes often employ intermediate steps to trans- form optical coherences to spin coherences for longer storage times. We analyze a scheme that uses three identical chirped control pulses for coherence rephasing in an inhomogeneously broadened en- semble of three-level Λ-systems. The pulses induce a cyclic permutation of the atomic populations in the adiabatic regime. Optical coherences created by a signal pulse are stored as spin coherences at an intermediate time interval, and are rephased for echo emission when the ensemble is returned to the initial state. Echo emission during a possible partial rephasing when the medium is inverted can be suppressed with an appropriate choice of control pulse wavevectors. We demonstrate that the scheme works in an optically dense ensemble, despite control pulse distortions during propaga- tion. It integrates conveniently the spin-wave storage step into memory schemes based on a second rephasing of the atomic coherences.

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