Work

Integer Fluxonium Qubit

Year: 2024

Type: article

Abstract: We describe a superconducting qubit derived from operating a properly designed fluxonium circuit in a zero magnetic field. The qubit has a frequency of about 4 GHz and an energy relaxation quality factor Q ≈ 0.7 × 10 7 , even though the dielectric loss quality factor of the circuit components is in the low- 10 5 range. The Ramsey coherence time exceeds 100 μ s , and the average fidelity of Clifford gates is benchmarked to F > 0.999 . These figures are expected to improve with optimized fabrication and measurement procedures. Our work establishes a ready-to-use “partially protected” superconducting qubit functioning in the frequency range of conventional transmons. Published by the American Physical Society 2024

Source: PRX Quantum

DOI: 10.1103/prxquantum.5.040318

Authors: Raymond A. Mencia, Wei-Ju Lin, Hyunheung Cho, Maxim G. Vavilov, Vladimir E. Manucharyan

Institutions: Joint Quantum Institute, École Polytechnique Fédérale de Lausanne, University of Maryland, College Park, University of Wisconsin–Madison

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,450

Funder: Army Research Office