Gartman, R.; Guarrera, V.; Bevilacqua, G.; Chalupczak, W. (2018) Linear and nonlinear coherent coupling in a Bell-Bloom magnetometer. Physical Review A, 98 (6). 061401 ISSN 2469-9926

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Abstract

Spin-exchange collisions in hot vapours are generally regarded as a decoherence mechanism. In contrast, we show that linear and non-linear spin-exchange coupling can lead to the generation of atomic coherence in a Bell-Bloom magnetometer. In particular, we theoretically and experimentally demonstrate that non-linear spin exchange coupling, acting in an analogous way to a wave-mixing mechanism, can create new modes of coherent excitation which inherit the magnetic properties of
the natural Larmor coherence. The generated coherences further couple via linear spin-exchange interaction, leading to an increase of the natural coherence lifetime of the system. Notably, the measurements are performed in a low-density caesium vapour and for non-zero magnetic �eld, outside the standard conditions for collisional coherence transfer. The strategies discussed are important for development of spin-exchange coupling into a resource for an improved measurement platform based on room-temperature alkali-metal vapours.

Item Type:	Article
Subjects:	Quantum Phenomena > Quantum Information Processing and Communication
Divisions:	Quantum Science
Identification number/DOI:	10.1103/PhysRevA.98.061401
Last Modified:	05 Feb 2019 14:29
URI:	http://eprintspublications.npl.co.uk/id/eprint/8263

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