21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

M3Or3C-03 [Invited]: Development of \pi-periodic Josephson Elements for Charge-Parity Qubits

24 Jul 2019, 15:00
Level 6, Room 14

Level 6, Room 14


Yebin Liu (Syracuse University)


Superconducting qubit designs with topological protection against local noise hold the promise of significantly increased coherence times and higher gate fidelities than is possible with conventional qubits. We are developing one such protected qubit design — the hybrid charge-parity qubit — that combines arrays of conventional Josephson junctions and high, but not extraordinarily high, kinetic inductance nanowires made from disordered superconducting thin films arranged into plaquettes to form a \pi-periodic Josephson element. Creating this \pi-periodic Josephson element at the heart of a charge-parity qubit requires particular values of the Josephson energy and charging energy of the junctions and the inductive energy of the nanowires. By varying the magnetic flux in each plaquette, we demonstrate the ability to tune these structures between regimes of 2\pi and \pi periodicity with devices that embed the plaquettes into an rf SQUID.

Primary authors

Yebin Liu (Syracuse University) Mr Kenneth Dodge (Syracuse University) Mr Michael Senatore (Syracuse University) Dr Shaojiang Zhu (University of Wisconsin-Madison) Mr Fnu Naveen (University of Wisconsin-Madison) Ms Abigail Shearrow (University of Wisconsin-Madison) Mr Francisco Schlenker (Physics, University of Wisconsin-Madison) Dr Andrey Klots (University of Wisconsin-Madison) Prof. Lara Faoro (University of Wisconsin-Madison) Prof. Lev Ioffe (University of Wisconsin-Madison) Prof. Robert McDermott (University of Wisconsin-Madison) Prof. Britton Plourde (Syracuse University)

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