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Collectively encoded Rydberg qubit

Spong, Nicholas L.R.; Jiao, Yuechun; Hughes, Oliver D.W.; Weatherill, Kevin J.; Lesanovsky, Igor; Adams, Charles S.

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Yuechun Jiao

Igor Lesanovsky


We demonstrate a collectively-encoded qubit based on a single Rydberg excitation stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent read-out is performed by mapping the excitation into a single photon. Ramsey interferometry is used to probe the coherence of the qubit, and to test the robustness to external perturbations. We show that qubit coherence is preserved even as we lose atoms from the polariton mode, preserving Ramsey fringe visibility. We show that dephasing due to electric field noise scales as the fourth power of field amplitude. These results show that robust quantum information processing can be achieved via collective encoding using Rydberg polaritons, and hence this system could provide an attractive alternative coding strategy for quantum computation and networking.


Spong, N. L., Jiao, Y., Hughes, O. D., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively encoded Rydberg qubit. Physical Review Letters, 127(6), Article 063604.

Journal Article Type Article
Acceptance Date Jun 28, 2021
Online Publication Date Aug 6, 2021
Publication Date Aug 6, 2021
Deposit Date Jul 1, 2021
Publicly Available Date Aug 6, 2021
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 127
Issue 6
Article Number 063604
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Copyright Statement
Published by the American Physical Society under the terms of<br /> the Creative Commons Attribution 4.0 International license.<br /> Further distribution of this work must maintain attribution to<br /> the author(s) and the published article&rsquo;s title, journal citation, and DOI.

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