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dc.contributor.author
Pechal, M.
dc.contributor.author
Salis, Gian
dc.contributor.author
Ganzhorn, M.
dc.contributor.author
Egger, Daniel
dc.contributor.author
Werninghaus, M.
dc.contributor.author
Filipp, Stefan
dc.date.accessioned
2021-12-20T13:50:29Z
dc.date.available
2021-12-06T17:32:22Z
dc.date.available
2021-12-20T13:50:29Z
dc.date.issued
2021
dc.identifier.issn
2160-3308
dc.identifier.other
10.1103/PhysRevX.11.041032
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/518948
dc.identifier.doi
10.3929/ethz-b-000518948
dc.description.abstract
In circuit-based quantum computing the available gate set typically consists of single-qubit gates acting on each individual qubit and at least one entangling gate between pairs of qubits. In certain physical architectures, however, some qubits may be “hidden” and lacking direct addressability through dedicated control and readout lines, for instance, because of limited on-chip routing capabilities, or because the number of control lines becomes a limiting factor for many-qubit systems. In this case, no single-qubit operations can be applied to the hidden qubits and their state cannot be measured directly. Instead, they may be controlled and read out only via single-qubit operations on connected “control” qubits and a suitable set of two-qubit gates. We first discuss the impact of such restricted control capabilities on the performance of specific qubit coupling networks. We then experimentally demonstrate full control and measurement capabilities in a superconducting two-qubit device with local single-qubit control and iswap and controlled-phase two-qubit interactions enabled by a tunable coupler. We further introduce an iterative tune-up process required to completely characterize the gate set used for quantum process tomography and evaluate the resulting gate fidelities.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Physical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Characterization and Tomography of a Hidden Qubit
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2021-11-15
ethz.journal.title
Physical Review X
ethz.journal.volume
11
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Phys. rev., X
ethz.pages.start
041032
en_US
ethz.size
15 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
College Park, MD
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-12-06T17:32:32Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-12-20T13:50:35Z
ethz.rosetta.lastUpdated
2022-03-29T16:42:52Z
ethz.rosetta.versionExported
true
ethz.COinS
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