Show simple item record

dc.contributor.authorTuorila, Jani
dc.contributor.authorPartanen, Matti
dc.contributor.authorAla-Nissila, Tapio
dc.contributor.authorMöttönen, Mikko
dc.date.accessioned2017-08-23T11:47:03Z
dc.date.available2017-08-23T11:47:03Z
dc.date.issued2017
dc.identifier.citationTuorila, J., Partanen, M., Ala-Nissila, T., & Möttönen, M. (2017). Efficient protocol for qubit initialization with a tunable environment. <em>npj Quantum Information</em>, 3, 27. <a href="https://doi.org/10.1038/s41534-017-0027-1">doi:10.1038/s41534-017-0027-1</a>
dc.identifier.otherTUTKAID_74671
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/55158
dc.description.abstractWe propose an efficient qubit initialization protocol based on a dissipative environment that can be dynamically adjusted. Here, the qubit is coupled to a thermal bath through a tunable harmonic oscillator. On-demand initialization is achieved by sweeping the oscillator rapidly into resonance with the qubit. This resonant coupling with the engineered environment induces fast relaxation to the ground state of the system, and a consecutive rapid sweep back to off resonance guarantees weak excess dissipation during quantum computations. We solve the corresponding quantum dynamics using a Markovian master equation for the reduced density operator of the qubit-bath system. This allows us to optimize the parameters and the initialization protocol for the qubit. Our analytical calculations show that the ground-state occupation of our system is well protected during the fast sweeps of the environmental coupling and, consequently, we obtain an estimate for the duration of our protocol by solving the transition rates between the low-energy eigenstates with the Jacobian diagonalization method. Our results suggest that the current experimental state of the art for the initialization speed of superconducting qubits at a given fidelity can be considerably improved.
dc.language.isoeng
dc.publisherNature Partner Journals
dc.relation.ispartofseriesnpj Quantum Information
dc.subject.otherquantum computers
dc.subject.otherqubits
dc.subject.otherqubit initialization
dc.titleEfficient protocol for qubit initialization with a tunable environment
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201708163500
dc.contributor.laitosInformaatioteknologian tiedekuntafi
dc.contributor.laitosFaculty of Information Technologyen
dc.contributor.oppiaineTietotekniikka
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2017-08-16T09:15:10Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn2056-6387
dc.relation.volume3
dc.type.versionpublishedVersion
dc.rights.copyright© the Authors, 2017. This article is licensed under a Creative Commons Attribution 4.0 International License.
dc.rights.accesslevelopenAccessfi
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1038/s41534-017-0027-1


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

© the Authors, 2017. This article is licensed under a Creative Commons Attribution 4.0 International License.
Except where otherwise noted, this item's license is described as © the Authors, 2017. This article is licensed under a Creative Commons Attribution 4.0 International License.