Triplet-blockaded Josephson supercurrent in double quantum dots

Abstract

Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrostatic gating and an external magnetic field. In this work, we directly measure the supercurrent reversal between adjacent charge states of an InAs nanowire double quantum dot with superconducting leads, in good agreement with theoretical models. In the even charge parity sector, we observe a supercurrent blockade with increasing magnetic field, corresponding to the spin singlet to triplet transition. Our results demonstrate a direct spin to supercurrent conversion, the superconducting equivalent of the Pauli spin blockade. This effect can be exploited in hybrid quantum architectures coupling the quantum states of spin systems and superconducting circuits.

arXiv commentPublished version. Supplementary Information is available as ancillary file, raw data and calculations can be downloaded from https://doi.org/10.5281/zenodo.3978236

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Cited by in corpus (21)

• Yu-Shiba-Rusinov states in real metals
• Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
• Anomalous Josephson current through a driven double quantum dot
• Evidence of Andreev blockade in a double quantum dot coupled to a superconductor
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