Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

The high kinetic inductance offered by granular aluminum (grAl) has recently been employed for linear inductors in superconducting high-impedance qubits and kinetic inductance detectors. Because of its large critical current density compared to typical Josephson junctions, its resilience to external...

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Autores principales:	Patrick Winkel, Kiril Borisov, Lukas Grünhaupt, Dennis Rieger, Martin Spiecker, Francesco Valenti, Alexey V. Ustinov, Wolfgang Wernsdorfer, Ioan M. Pop
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/327f81910f3e40e9a07be47175a61cca
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spelling	oai:doaj.org-article:327f81910f3e40e9a07be47175a61cca2021-12-02T14:23:08ZImplementation of a Transmon Qubit Using Superconducting Granular Aluminum10.1103/PhysRevX.10.0310322160-3308https://doaj.org/article/327f81910f3e40e9a07be47175a61cca2020-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.031032http://doi.org/10.1103/PhysRevX.10.031032https://doaj.org/toc/2160-3308The high kinetic inductance offered by granular aluminum (grAl) has recently been employed for linear inductors in superconducting high-impedance qubits and kinetic inductance detectors. Because of its large critical current density compared to typical Josephson junctions, its resilience to external magnetic fields, and its low dissipation, grAl may also provide a robust source of nonlinearity for strongly driven quantum circuits, topological superconductivity, and hybrid systems. Having said that, can the grAl nonlinearity be sufficient to build a qubit? Here we show that a small grAl volume (10×200×500 nm^{3}) shunted by a thin film aluminum capacitor results in a microwave oscillator with anharmonicity α two orders of magnitude larger than its spectral linewidth Γ_{01}, effectively forming a transmon qubit. With increasing drive power, we observe several multiphoton transitions starting from the ground state, from which we extract α=2π×4.48 MHz. Resonance fluorescence measurements of the \|0⟩→\|1⟩ transition yield an intrinsic qubit linewidth γ=2π×10 kHz, corresponding to a lifetime of 16 μs, as confirmed by pulsed time-domain measurements. This linewidth remains below 2π×150 kHz for in-plane magnetic fields up to ∼70 mT.Patrick WinkelKiril BorisovLukas GrünhauptDennis RiegerMartin SpieckerFrancesco ValentiAlexey V. UstinovWolfgang WernsdorferIoan M. PopAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 3, p 031032 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Patrick Winkel Kiril Borisov Lukas Grünhaupt Dennis Rieger Martin Spiecker Francesco Valenti Alexey V. Ustinov Wolfgang Wernsdorfer Ioan M. Pop Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
description	The high kinetic inductance offered by granular aluminum (grAl) has recently been employed for linear inductors in superconducting high-impedance qubits and kinetic inductance detectors. Because of its large critical current density compared to typical Josephson junctions, its resilience to external magnetic fields, and its low dissipation, grAl may also provide a robust source of nonlinearity for strongly driven quantum circuits, topological superconductivity, and hybrid systems. Having said that, can the grAl nonlinearity be sufficient to build a qubit? Here we show that a small grAl volume (10×200×500 nm^{3}) shunted by a thin film aluminum capacitor results in a microwave oscillator with anharmonicity α two orders of magnitude larger than its spectral linewidth Γ_{01}, effectively forming a transmon qubit. With increasing drive power, we observe several multiphoton transitions starting from the ground state, from which we extract α=2π×4.48 MHz. Resonance fluorescence measurements of the \|0⟩→\|1⟩ transition yield an intrinsic qubit linewidth γ=2π×10 kHz, corresponding to a lifetime of 16 μs, as confirmed by pulsed time-domain measurements. This linewidth remains below 2π×150 kHz for in-plane magnetic fields up to ∼70 mT.
format	article
author	Patrick Winkel Kiril Borisov Lukas Grünhaupt Dennis Rieger Martin Spiecker Francesco Valenti Alexey V. Ustinov Wolfgang Wernsdorfer Ioan M. Pop
author_facet	Patrick Winkel Kiril Borisov Lukas Grünhaupt Dennis Rieger Martin Spiecker Francesco Valenti Alexey V. Ustinov Wolfgang Wernsdorfer Ioan M. Pop
author_sort	Patrick Winkel
title	Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
title_short	Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
title_full	Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
title_fullStr	Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
title_full_unstemmed	Implementation of a Transmon Qubit Using Superconducting Granular Aluminum
title_sort	implementation of a transmon qubit using superconducting granular aluminum
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/327f81910f3e40e9a07be47175a61cca
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Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

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