ac Josephson effect in a gate-tunable 
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 nanowire superconducting weak link

Haller, R.; Osterwalder, M.; Fülöp, G.; Ridderbos, J.; Jung, M.; Schönenberger, C.

doi:10.1103/physrevb.108.094514

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.094514

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ac Josephson effect in a gate-tunable Cd3As2 nanowire superconducting weak link

R. Haller,

M. Osterwalder,

G. Fülöp

et al.

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2024

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Cited by 3 publications

References 64 publications

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Bolometric detection of Josephson radiation

Karimi,

Steffensen,

Higginbotham

et al. 2024

Nat. Nanotechnol.

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One of the most promising approaches towards large-scale quantum computation uses devices based on many Josephson junctions. Yet, even today, open questions regarding the single junction remain unsolved, such as the detailed understanding of the quantum phase transitions, the coupling of the Josephson junction to the environment or how to improve the coherence of a superconducting qubit. Here we design and build an engineered on-chip reservoir connected to a Josephson junction that acts as an efficient bolometer for detecting the Josephson radiation under non-equilibrium, that is, biased conditions. The bolometer converts the a.c. Josephson current at microwave frequencies up to about 100 GHz into a temperature rise measured by d.c. thermometry. A circuit model based on realistic parameter values captures both the current–voltage characteristics and the measured power quantitatively. The present experiment demonstrates an efficient, wide-band, thermal detection scheme of microwave photons and provides a sensitive detector of Josephson dynamics beyond the standard conductance measurements.

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Bolometric detection of Josephson radiation

Karimi,

Steffensen,

Higginbotham

et al. 2024

Nat. Nanotechnol.

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Charge-4e supercurrent in a two-dimensional InAs-Al superconductor-semiconductor heterostructure

Ciaccia,

Haller,

Drachmann

et al. 2024

Commun Phys

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Superconducting qubits with intrinsic noise protection offer a promising approach to improve the coherence of quantum information. Crucial to such protected qubits is the encoding of the logical quantum states into wavefunctions with disjoint support. Such encoding can be achieved by a Josephson element with an unusual charge-4e supercurrent emerging from the coherent transfer of pairs of Cooper-pairs. In this work, we demonstrate the controlled conversion of a conventional charge-2e dominated to a charge-4e dominated supercurrent in a superconducting quantum interference device (SQUID) consisting of gate-tunable planar Josephson junctions. We investigate the ac Josephson effect of the SQUID and measure a dominant photon emission at twice the fundamental Josephson frequency together with a doubling of the number of Shapiro steps, both consistent with the appearance of charge-4e supercurrent. Our results present a step towards protected superconducting qubits based on superconductor-semiconductor hybrid materials.

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Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2 mediated asymmetric SQUIDs

Yu,

Cuozzo,

Sapkota

et al. 2024

Phys. Rev. B

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ac Josephson effect in a gate-tunable Cd3As2 nanowire superconducting weak link

Cited by 3 publications

References 64 publications

Bolometric detection of Josephson radiation

Bolometric detection of Josephson radiation

Charge-4e supercurrent in a two-dimensional InAs-Al superconductor-semiconductor heterostructure

Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2 mediated asymmetric SQUIDs

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