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

Abstract

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 $\sin \left(2\phi \right)$ 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 a silicon technology compatible platform.

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Cited by in corpus (45)

• Superconducting phenomena in systems with unconventional magnets
• Enhancing the Josephson diode effect with Majorana bound states
• Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
• Strong tunable coupling between two distant superconducting spin qubits
• Tuning the Josephson diode response with an ac current
• A gate tunable transmon qubit in planar Ge
• Progress in superconductor-semiconductor topological Josephson junctions
• Large Second-Order Josephson Effect in Planar Superconductor-Semiconductor Junctions
• Interfering Josephson diode effect in Ta2Pd3Te5 asymmetric edge interferometer
• Blueprint for all-to-all connected superconducting spin qubits
• A quantum dot in germanium proximitized by a superconductor
• Direct measurement of a $\sin (2\phi )$ current phase relation in a graphene superconducting quantum interference device
• Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule
• Gatemon qubit on a germanium quantum-well heterostructure
• Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors
• From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content
• Microwave-assisted unidirectional superconductivity in Al-InAs nanowire-Al junctions under magnetic fields
• Josephson diode effect with Andreev and Majorana bound states
• Double loop dc-SQUID as a tunable Josephson diode
• The hybrid Josephson rhombus: A superconducting element with tailored current-phase relation
• Dissipationless Nonlinearity in Quantum Material Josephson Diodes
• Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits
• Intrinsic superconducting diode effect and nonreciprocal superconductivity in rhombohedral graphene multilayers
• Germanium-based hybrid semiconductor-superconductor topological quantum computing platforms: Disorder effects
• Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field
• Transverse Cooper-Pair Rectifier
• Non-Hermitian superconducting diode effect
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Influence of capacitance and thermal fluctuations on the Josephson diode effect in asymmetric higher-harmonic SQUIDs
• Biharmonic-Drive Tunable Josephson Diode
• Tunable superconducting diode effect in higher-harmonic InSb nanosheet interferometers
• Josephson Diode Effect from Nonequilibrium Current in a Superconducting Interferometer
• Superconducting Proximity Effect in Two-Dimensional Hole Gases
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Diode effect in Shapiro steps in an asymmetric SQUID with a superconducting nanobridge
• Josephson diode effect in nanowire-based Andreev molecules
• Effect of 2${}^{\text{nd}}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier
• Theory of superconducting proximity effect in hole-based hybrid semiconductor-superconductor devices
• Tunable diode effect in a superconducting tunnel junction with biharmonic drive
• Relations between normal state nonreciprocal transport and the superconducting diode effect in the trivial and topological phases
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Supercurrent and multiple Andreev reflections in Ge hut nanowire Josephson Junctions
• Towards a $\cos (2\phi )$ Josephson element using aluminum junctions with well-transmitted channels
• Nanoscale electrothermal-switch superconducting diode for electrically programmable superconducting circuits
• Gate- and flux-tunable sin(2$\phi$) Josephson element with proximitized Ge-based junctions