Collectively Encoded Rydberg Qubit

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

Abstract

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 readout is performed by mapping the excitation into a single photon. Ramsey interferometry is used to probe the coherence of the qubit, as well as 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.

Citation

Spong, N. L. R., Jiao, Y., Hughes, O. D. W., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively Encoded Rydberg Qubit. Physical Review Letters, 127(6), Article 063604. https://doi.org/10.1103/PhysRevLett.127.063604

• Journal Article Type: Article
• Acceptance Date: Jun 28, 2021
• Online Publication Date: Aug 6, 2021
• Publication Date: Aug 6, 2021
• Deposit Date: Jul 21, 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
• DOI: https://doi.org/10.1103/PhysRevLett.127.063604
• Public URL: https://nottingham-repository.worktribe.com/output/5812725
• Publisher URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.063604