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Published January 16, 2017 | Submitted + Published + Supplemental Material
Journal Article Open

Interfacing broadband photonic qubits to on-chip cavity-protected rare-earth ensembles

Abstract

Ensembles of solid-state optical emitters enable broadband quantum storage and transduction of photonic qubits, with applications in high-rate quantum networks for secure communications and interconnecting future quantum computers. To transfer quantum states using ensembles, rephasing techniques are used to mitigate fast decoherence resulting from inhomogeneous broadening, but these techniques generally limit the bandwidth, efficiency and active times of the quantum interface. Here, we use a dense ensemble of neodymium rare-earth ions strongly coupled to a nanophotonic resonator to demonstrate a significant cavity protection effect at the single-photon level—a technique to suppress ensemble decoherence due to inhomogeneous broadening. The protected Rabi oscillations between the cavity field and the atomic super-radiant state enable ultra-fast transfer of photonic frequency qubits to the ions (∼50 GHz bandwidth) followed by retrieval with 98.7% fidelity. With the prospect of coupling to other long-lived rare-earth spin states, this technique opens the possibilities for broadband, always-ready quantum memories and fast optical-to-microwave transducers.

Additional Information

© 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received: 15 September 2016; Accepted: 29 November 2016; Published online: 16 January 2017. This work is funded by NSF CAREER 1454607 and AFOSR Quantum Transduction MURI FA9550-15-1-002. Device fabrication was performed in the Kavli Nanoscience Institute with support from Gordon and Betty Moore Foundation. Some equipment funding was provided by NSF Institute for Quantum Information and Matter PHY-1125565 with support from Gordon and Betty Moore Foundation GBMF-12500028. Author Contributions: T.Z. and A.F. conceived and designed the experiments. T.Z. and J.R. fabricated the device. T.Z. and J.M.K. performed the measurements and analysed the data. T.Z. and A.F. wrote the manuscript with input from all authors. The authors declare no competing financial interests.

Attached Files

Published - ncomms14107.pdf

Submitted - 1604.00143v1.pdf

Supplemental Material - ncomms14107-s1.pdf

Supplemental Material - ncomms14107-s2.mov

Supplemental Material - ncomms14107-s3.mov

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Created:
August 19, 2023
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