Diode Effects in Current-Biased Josephson Junctions

Steiner, Jacob F.; Melischek, Larissa; Trahms, Martina; Franke, Katharina J.; Oppen, Felix von

doi:10.1103/physrevlett.130.177002

Cited by 23 publications

(1 citation statement)

References 40 publications

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“…Gate-tunable superconducting and Andreev spin qubits 2 – 6 , parametric amplifiers 7 , highly efficient Cooper pair splitters 8 – 10 and a minimal Kitaev chain 11 are prominent examples of what has been achieved in the past decade. In addition, non-reciprocal devices, such as superconducting diodes have attracted a lot of interest 12 , especially in Josephson junctions in the presence 13 – 15 or absence 16 – 18 of a Zeeman field and in multiterminal devices 19 , 20 . Diodes can be also realized in a superconducting quantum interference device (SQUID) geometry by exploiting a magnetic flux to achieve time-reversal breaking 21 – 23 .…”

Section: Introductionmentioning

confidence: 99%

Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium

Valentini,

Sagi,

Baghumyan

et al. 2024

Nat Commun

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Superconductor/semiconductor hybrid devices have attracted increasing interest in the past years. Superconducting electronics aims to complement semiconductor technology, while hybrid architectures are at the forefront of new ideas such as topological superconductivity and protected qubits. In this work, we engineer the induced superconductivity in two-dimensional germanium hole gas by varying the distance between the quantum well and the aluminum. We demonstrate a hard superconducting gap and realize an electrically and flux tunable superconducting diode using a superconducting quantum interference device (SQUID). This allows to tune the current phase relation (CPR), to a regime where single Cooper pair tunneling is suppressed, creating a $$\sin \left(2\varphi \right)$$ sin 2 φ CPR. Shapiro experiments complement this interpretation and the microwave drive allows to create a diode with ≈ 100% efficiency. The reported results open up the path towards integration of spin qubit devices, microwave resonators and (protected) superconducting qubits on the same silicon technology compatible platform.

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