Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M10: Quantum Memories
2:00 PM–3:48 PM,
Wednesday, June 2, 2021
Chair: Zheshen Zhang, University of Arizona
Abstract: M10.00004 : Continuous protection from inhomogeneous dephasing
2:36 PM–2:48 PM
Live
Presenter:
Eilon Poem
Authors:
Eilon Poem
Ran Finkelstein
(Weizmann Institute of Science)
Ofer Firstenberg
(Weizmann Institute of Science)
Collaborations:
R. Finkelstein, O. Lahad, I. Cohen, O. Davidson, S. Kiriati, E. Poem, O. Firstenberg
As an experimental case study, we focus on motional dephasing of a spin wave in an atomic ensemble. We employ light storage and retrieval for quantifying the coherence time, which without protection is limited by the ballistic atomic motion at random velocities along the spin wave [1]. When applying the protection scheme, the effect of the drive field can be understood as a velocity-dependent light shift, maintaining the correlations between position and phase of the spin wave. We demonstrate complete suppression of the inhomogeneous dephasing [2]. The spectroscopic manifestation of the continuous protection is the substantial enhancement and narrowing of spectral lines [3,4].
Our scheme is applicable to various gas, solid, and engineered systems suffering from dephasing due to variations of conditions in time, space, or other domains.
[1] R. Finkelstein, E. Poem, O. Michel, O. Lahad, and O. Firstenberg, "Fast, noise-free memory for photon synchronization at room temperature", Science Advances 4 (2018).
[2] R. Finkelstein, O. Lahad, I. Cohen, O. Davidson, E. Poem, and O. Firstenberg, “Continuous protection of a collective state from inhomogeneous dephasing”, Physical Review X 11 (2021).
[3] O. Lahad, R. Finkelstein, O. Davidson, O. Michel, E. Poem, and O. Firstenberg, “Recovering the homogeneous absorption of inhomogeneous media”, Physical Review Letters 123 (2019).
[4] R. Finkelstein, O. Lahad, O. Michel, O. Davidson, E. Poem, O. Firstenberg, “Power narrowing: Counteracting Doppler broadening in two-color transitions”, New J. Phys. 21 (2019).
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