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Superconducting Qubits

The high-coherence fluxonium qubit

arXiv

Authors: Long B. Nguyen, Yen-Hsiang Lin, Aaron Somoroff, Raymond Mencia, Nicholas Grabon, Vladimir E. Manucharyan

Year

2018

Paper ID

23799

Status

Preprint

Abstract Read

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Abstract

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.

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We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T2 > 100 microseconds (T2 > 300 microseconds in...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1810.11006 [2] arXiv https://arxiv.org/abs/1810.11006 [3] Publisher https://arxiv.org/abs/1810.11006

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