Quantum transduction of a superconducting qubit in an electro-optomechanical and an electro-optomagnonical system
Roson Nongthombam, Pooja Kumari Gupta, Amarendra K. Sarma
DOI 10.1103/PhysRevA.108.043501 · Physical Review A
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Abstract
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.
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