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Ground state phase diagram and "parity flipping'' microwave transitions in a gate-tunable Josephson Junction

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arxiv 2312.12914 v1 pith:3542ETOH submitted 2023-12-20 cond-mat.mes-hall

M. R. Sahu , F. J. Matute-Cañadas , M. Benito , P. Krogstrup , J. Nygård , M. F. Goffman , C. Urbina , A. Levy Yeyati
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H. Pothier
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classification cond-mat.mes-hall
keywords microwavestatecloseflippinggate-tunablegroundjosephsonjunction
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We probed a gate-tunable InAs nanowire Josephson weak link by coupling it to a microwave resonator. Tracking the resonator frequency shift when the weak link is close to pinch-off, we observe that the ground state of the latter alternates between a singlet and a doublet when varying either the gate voltage or the superconducting phase difference across it. The corresponding microwave absorption spectra display lines that approach zero energy close to the singlet-doublet boundaries, suggesting parity flipping transitions, which are in principle forbidden in microwave spectroscopy and expected to arise only in tunnel spectroscopy. We tentatively interpret them by means of an ancillary state isolated in the junction acting as a reservoir for individual electrons.

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    A flat-band approximation of the Richardson model permits exact diagonalization of the generalized transmon Hamiltonian for Andreev spin qubits, simultaneously incorporating charging energy, phase fluctuations, and sp...

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