Singlet-doublet transitions of a quantum dot Josephson junction revealed in a transmon circuit: finite temperature transitions
ORAL
Abstract
Probing the mesoscopic physics of hybrid superconductor-semiconductor elements using a circuit quantum electrodynamics (cQED) architecture offers enhanced energy and time resolution compared to DC transport techniques, and allows for additional methods of coherent control. Here we investigate the parity phase diagram of a quantum dot with superconducting leads using a hybrid transmon architecture. Our device is composed of a transmon where the Josephson coupling is determined by a gate-controlled quantum dot defined in an InAs-Al nanowire.
In addition to mapping out the zero-temperature parity phase diagram, we measure the finite-temperature quasiparticle dynamics across the ground state transitions. We find that the charging energy of the quantum dot can extend the fermion parity lifetime of the junction up to milliseconds.
In addition to mapping out the zero-temperature parity phase diagram, we measure the finite-temperature quasiparticle dynamics across the ground state transitions. We find that the charging energy of the quantum dot can extend the fermion parity lifetime of the junction up to milliseconds.
*Research supported by funding from the Dutch Research Council (NWO), the allowance for Top consortia for Knowledge and Innovation (TKI's) from the Dutch Ministry of Economic Affairs and the Microsoft Quantum initiative.
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Presenters
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Arno Bargerbos
- Delft University of Technology
- Qutech, Delft University of Technology