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Ultracold molecules for quantum simulation: rotational coherence in CaF and RbCs

Blackmore, J.A.; Caldwell, L.; Gregory, P.D.; Bridge, E.M.; Sawant, R.; Aldegunde, J.; Mur-Petit, J.; Jaksch, D.; Hutson, J.M.; Sauer, B.E.; Tarbutt, M.R.; Cornish, S.L.

Ultracold molecules for quantum simulation: rotational coherence in CaF and RbCs Thumbnail


Authors

J.A. Blackmore

L. Caldwell

P.D. Gregory

E.M. Bridge

R. Sawant

J. Aldegunde

J. Mur-Petit

D. Jaksch

B.E. Sauer

M.R. Tarbutt



Abstract

Polar molecules offer a new platform for quantum simulation of systems with long-range interactions, based on the electrostatic interaction between their electric dipole moments. Here, we report the development of coherent quantum state control using microwave fields in $^{40}$Ca$^{19}$F and $^{87}$Rb$^{133}$Cs molecules, a crucial ingredient for many quantum simulation applications. We perform Ramsey interferometry measurements with fringe spacings of $\sim 1~\rm kHz$ and investigate the dephasing time of a superposition of $N=0$ and $N=1$ rotational states when the molecules are confined. For both molecules, we show that a judicious choice of molecular hyperfine states minimises the impact of spatially varying transition-frequency shifts across the trap. For magnetically trapped $^{40}$Ca$^{19}$F we use a magnetically insensitive transition and observe a coherence time of 0.61(3)~ms. For optically trapped $^{87}$Rb$^{133}$Cs we exploit an avoided crossing in the AC Stark shifts and observe a maximum coherence time of 0.75(6)~ms.

Citation

Blackmore, J., Caldwell, L., Gregory, P., Bridge, E., Sawant, R., Aldegunde, J., …Cornish, S. (2018). Ultracold molecules for quantum simulation: rotational coherence in CaF and RbCs. Quantum Science and Technology, 4(1), Article 014010. https://doi.org/10.1088/2058-9565/aaee35

Journal Article Type Article
Acceptance Date Nov 5, 2018
Online Publication Date Dec 5, 2018
Publication Date Dec 5, 2018
Deposit Date Sep 18, 2018
Publicly Available Date Dec 7, 2018
Journal Quantum Science and Technology
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 4
Issue 1
Article Number 014010
DOI https://doi.org/10.1088/2058-9565/aaee35
Related Public URLs https://arxiv.org/abs/1804.02372

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http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
Any further distribution of this work must maintain
attribution to the author(s) and the title of
the work, journal citation and DOI.





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