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Bulletin of the American Physical Society

Coherences of transmon qubits embedded in superconducting whispering gallery mode resonators

Zlatko Minev, Kyle Serniak, Ioan M. Pop, Zaki Leghtas, Katrina Sliwa, Luigi Frunzio, R. J. Schoelkopf, Michel Devoret

Published Mar 6, 2015• 0 citations
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We study the quantum transduction of a superconducting qubit to an optical photon in electro-optomechanical and electro-optomagnonical systems. The electro-optomechanical system comprises a flux-tunable transmon qubit coupled to a suspended mechanical beam, which then couples to an optical cavity. Similarly, in an electro-optomagnonical system, a flux-tunable transmon qubit is coupled to an optical whispering gallery mode via a magnon excitation in a yttrium iron garnet ferromagnetic sphere. In both systems, the transduction process is done in sequence. In the first sequence, the qubit states are encoded in coherent excitations of phonon (magnon) modes through the phonon-qubit (magnon-qubit) interaction, which is nondemolition in the qubit part. We then measure the phonon (magnon) excitations, which reveal the qubit states, by counting the average number of photons in the optical cavities. The measurement of the phonon (magnon) excitations can be performed at regular intervals of time.