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

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Blackmore, Jacob A
Caldwell, Luke
Gregory, Philip D
Bridge, Elizabeth M
Sawant, Rahul
Aldegunde, Jesus
Mur-Petit, Jordi
Jaksch, Dieter
Hutson, Jeremy M
Sauer, BE
Tarbutt, MR
Cornish, Simon L
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2019
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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 40Ca19F and 87Rb133Cs molecules, a crucial ingredient for many quantum simulation applications. We perform Ramsey interferometry measurements with fringe spacings of ~1 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 40Ca19F we use a magnetically insensitive transition and observe a coherence time of 0.61(3) ms. For optically trapped 87Rb133Cs 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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Quantum Science and Technology

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4

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1

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© 2018 IOP Publishing Ltd. 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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Physical sciences

Science & Technology

Quantum Science & Technology

Physics, Multidisciplinary

Physics

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Blackmore, JA; Caldwell, L; Gregory, PD; Bridge, EM; Sawant, R; Aldegunde, J; Mur-Petit, J; Jaksch, D; Hutson, JM; Sauer, BE; Tarbutt, MR; Cornish, SL, Ultracold molecules for quantum simulation: rotational coherences in CaF and RbCs, Quantum Science and Technology, 2019, 4 (1)

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