State leakage during fast decay and control of a superconducting transmon qubit

Abstract Superconducting Josephson junction qubits constitute the main current technology for many applications, including scalable quantum computers and thermal devices. Theoretical modeling of such systems is usually done within the two-level approximation. However, accurate theoretical modeling r...

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Autores principales:	Aravind Plathanam Babu, Jani Tuorila, Tapio Ala-Nissila
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/49cec84da40149c9bf6dae61a1d1f539
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spelling	oai:doaj.org-article:49cec84da40149c9bf6dae61a1d1f5392021-12-02T14:11:36ZState leakage during fast decay and control of a superconducting transmon qubit10.1038/s41534-020-00357-z2056-6387https://doaj.org/article/49cec84da40149c9bf6dae61a1d1f5392021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-020-00357-zhttps://doaj.org/toc/2056-6387Abstract Superconducting Josephson junction qubits constitute the main current technology for many applications, including scalable quantum computers and thermal devices. Theoretical modeling of such systems is usually done within the two-level approximation. However, accurate theoretical modeling requires taking into account the influence of the higher excited states without limiting the system to the two-level qubit subspace. Here, we study the dynamics and control of a superconducting transmon using the numerically exact stochastic Liouville–von Neumann equation approach. We focus on the role of state leakage from the ideal two-level subspace for bath induced decay and single-qubit gate operations. We find significant short-time state leakage due to the strong coupling to the bath. We quantify the leakage errors in single-qubit gates and demonstrate their suppression with derivative removal adiabatic gates (DRAG) control for a five-level transmon in the presence of decoherence. Our results predict the limits of accuracy of the two-level approximation and possible intrinsic constraints in qubit dynamics and control for an experimentally relevant parameter set.Aravind Plathanam BabuJani TuorilaTapio Ala-NissilaNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Aravind Plathanam Babu Jani Tuorila Tapio Ala-Nissila State leakage during fast decay and control of a superconducting transmon qubit
description	Abstract Superconducting Josephson junction qubits constitute the main current technology for many applications, including scalable quantum computers and thermal devices. Theoretical modeling of such systems is usually done within the two-level approximation. However, accurate theoretical modeling requires taking into account the influence of the higher excited states without limiting the system to the two-level qubit subspace. Here, we study the dynamics and control of a superconducting transmon using the numerically exact stochastic Liouville–von Neumann equation approach. We focus on the role of state leakage from the ideal two-level subspace for bath induced decay and single-qubit gate operations. We find significant short-time state leakage due to the strong coupling to the bath. We quantify the leakage errors in single-qubit gates and demonstrate their suppression with derivative removal adiabatic gates (DRAG) control for a five-level transmon in the presence of decoherence. Our results predict the limits of accuracy of the two-level approximation and possible intrinsic constraints in qubit dynamics and control for an experimentally relevant parameter set.
format	article
author	Aravind Plathanam Babu Jani Tuorila Tapio Ala-Nissila
author_facet	Aravind Plathanam Babu Jani Tuorila Tapio Ala-Nissila
author_sort	Aravind Plathanam Babu
title	State leakage during fast decay and control of a superconducting transmon qubit
title_short	State leakage during fast decay and control of a superconducting transmon qubit
title_full	State leakage during fast decay and control of a superconducting transmon qubit
title_fullStr	State leakage during fast decay and control of a superconducting transmon qubit
title_full_unstemmed	State leakage during fast decay and control of a superconducting transmon qubit
title_sort	state leakage during fast decay and control of a superconducting transmon qubit
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/49cec84da40149c9bf6dae61a1d1f539
work_keys_str_mv	AT aravindplathanambabu stateleakageduringfastdecayandcontrolofasuperconductingtransmonqubit AT janituorila stateleakageduringfastdecayandcontrolofasuperconductingtransmonqubit AT tapioalanissila stateleakageduringfastdecayandcontrolofasuperconductingtransmonqubit
_version_	1718391838701780992

State leakage during fast decay and control of a superconducting transmon qubit

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