Little-Parks effect in a semiconducting nanowire-based superconducting qubit with <i>in-situ</i> switching between transport and cQED

Anders Kringhøj
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Authors:

Anders Kringhøj
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Thorvald W Larsen
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Oscar Erlandsson
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Deividas Sabonis
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Bernard Van Heck
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark and Microsoft Quantum, Microsoft Sta)

Ivana Petkovic
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Robert P. G. McNeil
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Marina Hesselberg
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Agnieszka Telecka
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Sachin Yadav
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Karolis Parfeniukas
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Karthik Jambunathan
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Peter Krogstrup
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Lucas Casparis
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Charles M Marcus
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Karl D Petersson
(Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)

Proximitized semiconducting nanowires serve as a promising platform for both superconducting qubits [1] and topological qubits based on Majorana zero modes (MZM) [2,3]. Here we demonstrate in-situ switching between coherent cQED measurements and transport measurements based on a full-shell nanowire using a Josephson junction as a gate tuneable switch. These field-compatible devices show flux-dependent lobe spectra in both transport and cQED measurements associated with the Little-Parks effect. Coherent operations are performed both around zero applied field and around 90 mT, corresponding to one flux quantum being threaded through the wire, with a destructive regime in between.
This opens the possibility of detecting the presence of MZMs in one-flux-quantum regime by cQED measurements.

[1] Larsen et. al. Phys. Rev. Lett. 115, 127001 (2015)
[2] Lutchyn et. al. arXiv:1809.05512 (2018)
[3] Vaitiekenas et. al. arXiv:1809.05513 (2018)

*We acknowledge funding from Microsoft and Danish National Research Foundation.

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session C28: Topological Quantum Information with Majorana Nanowires

Abstract: C28.00007 : Little-Parks effect in a semiconducting nanowire-based superconducting qubit with in-situ switching between transport and cQED*

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