Information capacity of a single photon

Rohde, PP; Fitzsimons, JF; Gilchrist, A

Information capacity of a single photon

Rohde, PP

Fitzsimons, JF Gilchrist, A

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Publication Type:: Journal Article
Citation:: Physical Review A - Atomic, Molecular, and Optical Physics, 2013, 88 (2)
Issue Date:: 2013-08-09

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Field	Value	Language
dc.contributor.author	Rohde, PP https://orcid.org/0000-0002-5814-7289	en_US
dc.contributor.author	Fitzsimons, JF	en_US
dc.contributor.author	Gilchrist, A	en_US
dc.date.issued	2013-08-09	en_US
dc.identifier.citation	Physical Review A - Atomic, Molecular, and Optical Physics, 2013, 88 (2)	en_US
dc.identifier.issn	1050-2947	en_US
dc.identifier.uri	http://hdl.handle.net/10453/114127
dc.description.abstract	Quantum states of light are the obvious choice for communicating quantum information. To date, encoding information into the polarization states of single photons has been widely used as these states form a natural closed two-state qubit. However, photons are able to encode much more - in principle, infinite - information via the continuous spatiotemporal degrees of freedom. Here we consider the information capacity of an optical quantum channel, such as an optical fiber, where a spectrally encoded single photon is the means of communication. We use the Holevo bound to calculate an upper bound on the channel capacity, and relate this to the spectral encoding basis and the spectral properties of the channel. Further, we derive analytic bounds on the capacity of such channels, and, in the case of a symmetric two-state encoding, calculate the exact capacity of the corresponding channel. © 2013 American Physical Society.	en_US
dc.relation.ispartof	Physical Review A - Atomic, Molecular, and Optical Physics	en_US
dc.relation.isbasedon	10.1103/PhysRevA.88.022310	en_US
dc.subject.classification	General Physics	en_US
dc.title	Information capacity of a single photon	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	88	en_US
utslib.for	0801 Artificial Intelligence and Image Processing	en_US
utslib.for	0206 Quantum Physics	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	03 Chemical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - QSI - Centre for Quantum Software and Information
utslib.copyright.status	open_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	88	en_US

Abstract:

Quantum states of light are the obvious choice for communicating quantum information. To date, encoding information into the polarization states of single photons has been widely used as these states form a natural closed two-state qubit. However, photons are able to encode much more - in principle, infinite - information via the continuous spatiotemporal degrees of freedom. Here we consider the information capacity of an optical quantum channel, such as an optical fiber, where a spectrally encoded single photon is the means of communication. We use the Holevo bound to calculate an upper bound on the channel capacity, and relate this to the spectral encoding basis and the spectral properties of the channel. Further, we derive analytic bounds on the capacity of such channels, and, in the case of a symmetric two-state encoding, calculate the exact capacity of the corresponding channel. © 2013 American Physical Society.

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http://hdl.handle.net/10453/114127