Work

Parity-Protected Superconductor-Semiconductor Qubit

Year: 2020

Type: article

Abstract: Coherence of superconducting qubits can be improved by implementing designs that protect the parity of Cooper pairs on superconducting islands. Here, we introduce a parity-protected qubit based on voltage-controlled semiconductor nanowire Josephson junctions, taking advantage of the higher harmonic content in the energy-phase relation of few-channel junctions. A symmetric interferometer formed by two such junctions, gate-tuned into balance and frustrated by a half-quantum of applied flux, yields a cos(2φ) Josephson element, reflecting coherent transport of pairs of Cooper pairs. We demonstrate that relaxation of the qubit can be suppressed tenfold by tuning into the protected regime.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.125.056801

Authors: T. W. Larsen, M. E. Gershenson, L. Casparis, A. Kringhøj, N. J. Pearson, R. P. G. McNeil, F. Kuemmeth, P. Krogstrup, K. D. Petersson, C. M. Marcus

Institutions: University of Copenhagen, Rutgers, The State University of New Jersey, ETH Zurich, Microsoft (Denmark)

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Villum Fonden, National Research Foundation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Danmarks Grundforskningsfond, National Center of Competence in Research Quantum Science and Technology, Army Research Office

OpenAlex ID: W3015982447

FWCI: 3.808

Cites: 65

Cited by: 102

Related to: 10