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Second-scale rotational coherence and dipolar interactions in a gas of ultracold polar molecules [dataset] Open Access

Ultracold polar molecules uniquely combine a rich structure of long-lived internal states with access to controllable long-range, anisotropic dipole-dipole interactions. In particular, the rotational states of polar molecules confined in optical tweezers or optical lattices may be used to encode interacting qubits for quantum computation or pseudo-spins for simulating quantum magnetism. As with all quantum platforms, the engineering of robust coherent superpositions of states is vital. However, for optically trapped molecules, the coherence time between rotational states is typically limited by inhomogeneous light shifts. Here we demonstrate a rotationally-magic optical trap for RbCs molecules that supports a Ramsey coherence time of 0.78(4) seconds in the absence of dipole-dipole interactions. This extends to >1.4 seconds at the 95% confidence level using a single spin-echo pulse. In our magic trap, dipolar interactions become the dominant mechanism by which Ramsey contrast is lost for superpositions that generate oscillating dipoles. By changing the states forming the superposition, we tune the effective dipole moment and show that the coherence time is inversely proportional to the strength of the dipolar interaction. Our work unlocks the full potential of the rotational degree of freedom in molecules for quantum computation and quantum simulation.

Descriptions

Resource type

Dataset

Contributors

Creator: Gregory, Philip ¹
Contact person: Gregory, Philip ¹
Data collector: Gregory, Philip ¹
Contact person: Cornish, Simon ¹
Data collector: Fernley, Luke ¹

¹ Durham University

Funder

Engineering and Physical Sciences Research Council

Research methods

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Chiefly CSV files.

Keyword

RbCs molecules

Subject

Quantum theory

Location

Language

Cited in

doi:10.48550/arXiv.2306.02991

Identifier

ark:/32150/r19593tv218
doi:10.15128/r19593tv218

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

P.D. Gregory

Date Uploaded

7 September 2023, 12:09:01

Date Modified

8 September 2023, 11:09:02

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File format: zip (ZIP Format)

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File size: 31252

Last modified: 2023:09:07 13:59:05+01:00

Filename: Second-scale rotational coherence and dipolar interactions in a gas of ultracold polar molecules .zip

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