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

Blackmore, J.A. and Caldwell, L. and Gregory, P.D. and Bridge, E.M. and Sawant, R. and Aldegunde, J. and Mur-Petit, J. and Jaksch, D. and Hutson, J.M. and Sauer, B.E. and Tarbutt, M.R. and Cornish, S.L. (2018) 'Ultracold molecules for quantum simulation : rotational coherence in CaF and RbCs.', Quantum science and technology., 4 (1). 014010.


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.

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Publisher 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.
Date accepted:05 November 2018
Date deposited:07 December 2018
Date of first online publication:05 December 2018
Date first made open access:No date available

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