Time-varying quantum channel models for superconducting qubits

Abstract The decoherence effects experienced by the qubits of a quantum processor are generally characterized using the amplitude damping time (T 1) and the dephasing time (T 2). Quantum channel models that exist at the time of writing assume that these parameters are fixed and invariant. However, r...

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Autores principales:	Josu Etxezarreta Martinez, Patricio Fuentes, Pedro Crespo, Javier Garcia-Frias
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/6d889ba8bc564ed0b548dcf9e8ae333d
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spelling	oai:doaj.org-article:6d889ba8bc564ed0b548dcf9e8ae333d2021-12-02T16:50:23ZTime-varying quantum channel models for superconducting qubits10.1038/s41534-021-00448-52056-6387https://doaj.org/article/6d889ba8bc564ed0b548dcf9e8ae333d2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00448-5https://doaj.org/toc/2056-6387Abstract The decoherence effects experienced by the qubits of a quantum processor are generally characterized using the amplitude damping time (T 1) and the dephasing time (T 2). Quantum channel models that exist at the time of writing assume that these parameters are fixed and invariant. However, recent experimental studies have shown that they exhibit a time-varying (TV) behaviour. These time-dependant fluctuations of T 1 and T 2, which become even more pronounced in the case of superconducting qubits, imply that conventional static quantum channel models do not capture the noise dynamics experienced by realistic qubits with sufficient precision. In this article, we study how the fluctuations of T 1 and T 2 can be included in quantum channel models. We propose the idea of time-varying quantum channel (TVQC) models, and we show how they provide a more realistic portrayal of decoherence effects than static models in some instances. We also discuss the divergence that exists between TVQCs and their static counterparts by means of a metric known as the diamond norm. In many circumstances this divergence can be significant, which indicates that the time-dependent nature of decoherence must be considered, in order to construct models that capture the real nature of quantum devices.Josu Etxezarreta MartinezPatricio FuentesPedro CrespoJavier Garcia-FriasNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-10 (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 Josu Etxezarreta Martinez Patricio Fuentes Pedro Crespo Javier Garcia-Frias Time-varying quantum channel models for superconducting qubits
description	Abstract The decoherence effects experienced by the qubits of a quantum processor are generally characterized using the amplitude damping time (T 1) and the dephasing time (T 2). Quantum channel models that exist at the time of writing assume that these parameters are fixed and invariant. However, recent experimental studies have shown that they exhibit a time-varying (TV) behaviour. These time-dependant fluctuations of T 1 and T 2, which become even more pronounced in the case of superconducting qubits, imply that conventional static quantum channel models do not capture the noise dynamics experienced by realistic qubits with sufficient precision. In this article, we study how the fluctuations of T 1 and T 2 can be included in quantum channel models. We propose the idea of time-varying quantum channel (TVQC) models, and we show how they provide a more realistic portrayal of decoherence effects than static models in some instances. We also discuss the divergence that exists between TVQCs and their static counterparts by means of a metric known as the diamond norm. In many circumstances this divergence can be significant, which indicates that the time-dependent nature of decoherence must be considered, in order to construct models that capture the real nature of quantum devices.
format	article
author	Josu Etxezarreta Martinez Patricio Fuentes Pedro Crespo Javier Garcia-Frias
author_facet	Josu Etxezarreta Martinez Patricio Fuentes Pedro Crespo Javier Garcia-Frias
author_sort	Josu Etxezarreta Martinez
title	Time-varying quantum channel models for superconducting qubits
title_short	Time-varying quantum channel models for superconducting qubits
title_full	Time-varying quantum channel models for superconducting qubits
title_fullStr	Time-varying quantum channel models for superconducting qubits
title_full_unstemmed	Time-varying quantum channel models for superconducting qubits
title_sort	time-varying quantum channel models for superconducting qubits
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6d889ba8bc564ed0b548dcf9e8ae333d
work_keys_str_mv	AT josuetxezarretamartinez timevaryingquantumchannelmodelsforsuperconductingqubits AT patriciofuentes timevaryingquantumchannelmodelsforsuperconductingqubits AT pedrocrespo timevaryingquantumchannelmodelsforsuperconductingqubits AT javiergarciafrias timevaryingquantumchannelmodelsforsuperconductingqubits
_version_	1718383044160651264

Time-varying quantum channel models for superconducting qubits

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