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(2 phi) 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.

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

Calcaterra, Stefano;Ballabio, Andrea;Chrastina, Daniel;Isella, Giovanni;
2024-01-01

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(2 phi) 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.
2024
Superconducting devices, Superconducting properties and materials
File in questo prodotto:
File Dimensione Formato  
ncomm-41467-023-44114-0.pdf

accesso aperto

: Publisher’s version
Dimensione 2.28 MB
Formato Adobe PDF
2.28 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1261527
Citazioni
  • ???jsp.display-item.citation.pmc??? 4
  • Scopus 25
  • ???jsp.display-item.citation.isi??? ND
social impact