The high-coherence fluxonium qubit

We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T2 > 100 microseconds (T2 > 300 microseconds in one device). Moreover, given the state of the art values of the surface loss tangent and the 1/f flux noise amplitude...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2018-10
Main Authors: Nguyen, Long B, Yen-Hsiang, Lin, Somoroff, Aaron, Mencia, Raymond, Grabon, Nicholas, Manucharyan, Vladimir E
Format: Article
Language:English
Subjects:
Anharmonicity
Josephson junctions
Quantum computing
Quantum theory
Qubits (quantum computing)
Superconductivity
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T2 > 100 microseconds (T2 > 300 microseconds in one device). Moreover, given the state of the art values of the surface loss tangent and the 1/f flux noise amplitude, coherence can be further improved beyond 1 millisecond. Our results violate a common viewpoint that the number of Josephson junctions in a superconducting circuit -- over 100 here -- must be minimized for best qubit coherence. We outline how the unique to fluxonium combination of long coherence time and large anharmonicity can benefit both gate-based and adiabatic quantum computing.
ISSN:2331-8422
DOI:10.48550/arxiv.1810.11006