Cavity piezo-mechanics for superconducting-nanophotonic quantum interface

Xu Han, Wei Fu, Changchun Zhong, Chang-Ling Zou, Yuntao Xu, Ayed Al Sayem, Mingrui Xu, Sihao Wang, Risheng Cheng, Liang Jiang and Hong X. Tang ()
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Xu Han: Yale University
Wei Fu: Yale University
Changchun Zhong: Yale University
Chang-Ling Zou: Yale University
Yuntao Xu: Yale University
Ayed Al Sayem: Yale University
Mingrui Xu: Yale University
Sihao Wang: Yale University
Risheng Cheng: Yale University
Liang Jiang: Yale University
Hong X. Tang: Yale University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Hybrid quantum systems are essential for the realization of distributed quantum networks. In particular, piezo-mechanics operating at typical superconducting qubit frequencies features low thermal excitations, and offers an appealing platform to bridge superconducting quantum processors and optical telecommunication channels. However, integrating superconducting and optomechanical elements at cryogenic temperatures with sufficiently strong interactions remains a tremendous challenge. Here, we report an integrated superconducting cavity piezo-optomechanical platform where 10 GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity at the same time. Taking advantage of the large piezo-mechanical cooperativity (Cem ~7) and the enhanced optomechanical coupling boosted by a pulsed optical pump, we demonstrate coherent interactions at cryogenic temperatures via the observation of efficient microwave-optical photon conversion. This hybrid interface makes a substantial step towards quantum communication at large scale, as well as novel explorations in microwave-optical photon entanglement and quantum sensing mediated by gigahertz phonons.

Date: 2020
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DOI: 10.1038/s41467-020-17053-3

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