Entanglement stabilization using ancilla-based parity detection and real-time feedback in superconducting circuits
dc.contributor.author
Andersen, Christian Kraglund
dc.contributor.author
Remm, Ants
dc.contributor.author
Lazar, Stefania
dc.contributor.author
Krinner, Sebastian
dc.contributor.author
Heinsoo, Johannes
dc.contributor.author
Besse, Jean-Claude
dc.contributor.author
Gabureac, Mihai
dc.contributor.author
Wallraff, Andreas
dc.contributor.author
Eichler, Christopher
dc.date.accessioned
2019-09-02T15:04:28Z
dc.date.available
2019-08-30T16:44:30Z
dc.date.available
2019-09-02T15:04:28Z
dc.date.issued
2019
dc.identifier.issn
2056-6387
dc.identifier.other
10.1038/s41534-019-0185-4
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/361654
dc.identifier.doi
10.3929/ethz-b-000361654
dc.description.abstract
Fault-tolerant quantum computing relies on the ability to detect and correct errors, which in quantum error correction codes is typically achieved by projectively measuring multi-qubit parity operators and by conditioning operations on the observed error syndromes. Here, we experimentally demonstrate the use of an ancillary qubit to repeatedly measure the ZZ and XX parity operators of two data qubits and to thereby project their joint state into the respective parity subspaces. By applying feedback operations conditioned on the outcomes of individual parity measurements, we demonstrate the real-time stabilization of a Bell state with a fidelity of F ≈ 74% in up to 12 cycles of the feedback loop. We also perform the protocol using Pauli frame updating and, in contrast to the case of real-time stabilization, observe a steady decrease in fidelity from cycle to cycle. The ability to stabilize parity over multiple feedback rounds with no further reduction in fidelity provides strong evidence for the feasibility of executing stabilizer codes on timescales much longer than the intrinsic coherence times of the constituent qubits.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Entanglement stabilization using ancilla-based parity detection and real-time feedback in superconducting circuits
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2019-08-15
ethz.journal.title
npj Quantum Information
ethz.journal.volume
5
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
npj Quantum Inf
ethz.pages.start
69
en_US
ethz.size
7 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
London
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02505 - Laboratorium für Festkörperphysik / Laboratory for Solid State Physics::03720 - Wallraff, Andreas / Wallraff, Andreas
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02505 - Laboratorium für Festkörperphysik / Laboratory for Solid State Physics::03720 - Wallraff, Andreas / Wallraff, Andreas
ethz.date.deposited
2019-08-30T16:44:38Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-09-02T15:04:40Z
ethz.rosetta.lastUpdated
2024-02-02T09:15:07Z
ethz.rosetta.versionExported
true
ethz.COinS
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Journal Article [130206]