Improving continuous-variable quantum channels with unitary averaging

Swain, SN; Marshman, RJ; Rohde, PP; Lund, AP; Solntsev, AS; Ralph, TC

Improving continuous-variable quantum channels with unitary averaging

Swain, SN Marshman, RJ Rohde, PP Lund, AP Solntsev, AS Ralph, TC

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Publisher:: American Physical Society (APS)
Publication Type:: Journal Article
Citation:: Physical Review A, 2024, 110, (3), pp. 032622
Issue Date:: 2024-09-01

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Field	Value	Language
dc.contributor.author	Swain, SN
dc.contributor.author	Marshman, RJ
dc.contributor.author	Rohde, PP
dc.contributor.author	Lund, AP
dc.contributor.author	Solntsev, AS
dc.contributor.author	Ralph, TC
dc.date.accessioned	2024-12-16T04:18:42Z
dc.date.available	2024-08-26
dc.date.available	2024-12-16T04:18:42Z
dc.date.issued	2024-09-01
dc.identifier.citation	Physical Review A, 2024, 110, (3), pp. 032622
dc.identifier.issn	2469-9926
dc.identifier.issn	2469-9934
dc.identifier.uri	http://hdl.handle.net/10453/182574
dc.description.abstract	A significant hurdle for quantum information and processing using bosonic systems is stochastic phase errors which occur as the photons propagate through a channel. These errors will reduce the purity of states passing through the channel and therefore reduce the channels capacity. We present a scheme of passive linear optical unitary averaging for protecting unknown Gaussian states transmitted through an optical channel. The scheme reduces the effect of phase noise on purity, squeezing, and entanglement, thereby enhancing the channel via a probabilistic-error-correcting protocol. The scheme is robust to loss and typically succeeds with high probability. We provide both numerical simulations and analytical approximations tailored for relevant parameters with the improvement of practical and current technology. We also show the asymptotic nature of the protocol, highlighting both current and future relevance.
dc.language	en
dc.publisher	American Physical Society (APS)
dc.relation.ispartof	Physical Review A
dc.relation.isbasedon	10.1103/PhysRevA.110.032622
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	© American Physical Society (APS) Improving continuous-variable quantum channels with unitary averaging. Physical review. A/Physical review, A 110, 3 (2024) https://doi.org/10.1103/PhysRevA.110.032622
dc.subject.classification	34 Chemical sciences
dc.subject.classification	49 Mathematical sciences
dc.subject.classification	51 Physical sciences
dc.title	Improving continuous-variable quantum channels with unitary averaging
dc.type	Journal Article
utslib.citation.volume	110
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
dc.date.updated	2024-12-16T04:18:41Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	110
utslib.citation.issue	3

Abstract:

A significant hurdle for quantum information and processing using bosonic systems is stochastic phase errors which occur as the photons propagate through a channel. These errors will reduce the purity of states passing through the channel and therefore reduce the channels capacity. We present a scheme of passive linear optical unitary averaging for protecting unknown Gaussian states transmitted through an optical channel. The scheme reduces the effect of phase noise on purity, squeezing, and entanglement, thereby enhancing the channel via a probabilistic-error-correcting protocol. The scheme is robust to loss and typically succeeds with high probability. We provide both numerical simulations and analytical approximations tailored for relevant parameters with the improvement of practical and current technology. We also show the asymptotic nature of the protocol, highlighting both current and future relevance.

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http://hdl.handle.net/10453/182574