Publication:
Progress toward optimal quantum tomography with unbalanced homodyning

dc.contributor.authorTeo, Y. S.
dc.contributor.authorJeong, H.
dc.contributor.authorSánchez Soto, Luis Lorenzo
dc.date.accessioned2023-06-17T22:14:17Z
dc.date.available2023-06-17T22:14:17Z
dc.date.issued2017-10-25
dc.description©2017 American Physical Society. The author thanks D. Ahn, Z. Hradil, and J. Rehacek for illuminating discussions. This work was financially supported by the BK21 Plus Program (21A20131111123) funded by the Ministry of Education (MOE; Korea) and National Research Foundation of Korea (NRF), an NRF grant funded by the Korean government (MSIP; Grant No. 2010-0018295), the KIST Institutional Program (Project No. 2E26680-16-P025), and the Spanish MINECO (Grant No. FIS2015-67963-P).
dc.description.abstractBalanced homodyning, heterodyning, and unbalanced homodyning are three well-known sampling techniques used in quantum optics to characterize photonic sources in the continuous-variable regime. We show that for all quantum states and all observable-parameter tomography schemes, which includes reconstructions of arbitrary operator moments and phase-space quasidistributions, localized sampling with unbalanced homodyning is always tomographically more powerful (gives more accurate estimators) than delocalized sampling with heterodyning. The latter is recently known to often give more accurate parameter reconstructions than conventional marginalized sampling with balanced homodyning. This result also holds for realistic photodetectors with subunit efficiency. With examples from first-through fourth-moment tomography, we demonstrate that unbalanced homodyning can outperform balanced homodyning when heterodyning fails to do so. This new benchmark takes us one step towards optimal continuous-variable tomography with conventional photodetectors and minimal experimental components.
dc.description.departmentDepto. de Óptica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/45560
dc.identifier.doi10.1103/PhysRevA.96.042333
dc.identifier.issn2469-9926
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevA.96.042333
dc.identifier.relatedurlhttps://journals.aps.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/18257
dc.issue.number4
dc.journal.titlePhysical review A
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.projectIDFIS2015-67963-P
dc.rights.accessRightsopen access
dc.subject.cdu535
dc.subject.keywordQuasi-probability distributions
dc.subject.keywordUncertainty principle
dc.subject.keywordHeterodyne-detection
dc.subject.keywordJoint measurement
dc.subject.keywordKey distribution
dc.subject.keywordNoise
dc.subject.keywordObservables
dc.subject.keywordReconstruction
dc.subject.keywordInformation
dc.subject.keywordVariables
dc.subject.ucmÓptica (Física)
dc.subject.unesco2209.19 Óptica Física
dc.titleProgress toward optimal quantum tomography with unbalanced homodyning
dc.typejournal article
dc.volume.number96
dspace.entity.typePublication
relation.isAuthorOfPublication88b797ff-cbd7-4498-a9c7-4e39f4fa4776
relation.isAuthorOfPublication.latestForDiscovery88b797ff-cbd7-4498-a9c7-4e39f4fa4776
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