Quantum reading capacity under thermal and correlated noise
Quantum communication theory sets the maximum rates at which information can be encoded and decoded reliably given the physical properties of the information carriers. Here we consider the problem of readout of a digital optical memory, where information is stored by means of the optical properties...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/80324 https://orcid.org/0000-0002-5227-4009 |
| _version_ | 1811076815253405696 |
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| author | Lupo, Cosmo Pirandola, Stefano Giovannetti, Vittorio Mancini, Stefano |
| author2 | Massachusetts Institute of Technology. Research Laboratory of Electronics |
| author_facet | Massachusetts Institute of Technology. Research Laboratory of Electronics Lupo, Cosmo Pirandola, Stefano Giovannetti, Vittorio Mancini, Stefano |
| author_sort | Lupo, Cosmo |
| collection | MIT |
| description | Quantum communication theory sets the maximum rates at which information can be encoded and decoded reliably given the physical properties of the information carriers. Here we consider the problem of readout of a digital optical memory, where information is stored by means of the optical properties of the memory cells that are in turn probed by shining a laser beam on them. Interesting features arise in the regime in which the probing light has to be treated quantum mechanically. The maximum rate of reliable readout defines the quantum reading capacity, which is proven to overcome the classical reading capacity—obtained by probing with classical light—in several relevant settings. We consider a model of optical memory in which information is encoded in the (complex-valued) attenuation factor and study the effects on the reading rates of thermal and correlated noise. The latter type of noise arises when the effects of wave diffraction on the probing light beam are taken into account. We discuss the advantages of quantum reading over the classical one and show that the former is substantially more robust than the latter under thermal noise in the regime of low power per pulse. |
| first_indexed | 2024-09-23T10:28:01Z |
| format | Article |
| id | mit-1721.1/80324 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:28:01Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/803242022-09-27T09:38:54Z Quantum reading capacity under thermal and correlated noise Lupo, Cosmo Pirandola, Stefano Giovannetti, Vittorio Mancini, Stefano Massachusetts Institute of Technology. Research Laboratory of Electronics Lupo, Cosmo Quantum communication theory sets the maximum rates at which information can be encoded and decoded reliably given the physical properties of the information carriers. Here we consider the problem of readout of a digital optical memory, where information is stored by means of the optical properties of the memory cells that are in turn probed by shining a laser beam on them. Interesting features arise in the regime in which the probing light has to be treated quantum mechanically. The maximum rate of reliable readout defines the quantum reading capacity, which is proven to overcome the classical reading capacity—obtained by probing with classical light—in several relevant settings. We consider a model of optical memory in which information is encoded in the (complex-valued) attenuation factor and study the effects on the reading rates of thermal and correlated noise. The latter type of noise arises when the effects of wave diffraction on the probing light beam are taken into account. We discuss the advantages of quantum reading over the classical one and show that the former is substantially more robust than the latter under thermal noise in the regime of low power per pulse. 2013-08-30T14:29:38Z 2013-08-30T14:29:38Z 2013-06 2012-12 Article http://purl.org/eprint/type/JournalArticle 1050-2947 1094-1622 http://hdl.handle.net/1721.1/80324 Lupo, Cosmo, Stefano Pirandola, Vittorio Giovannetti, and Stefano Mancini. “Quantum reading capacity under thermal and correlated noise.” Physical Review A 87, no. 6 (June 2013). © 2013 American Physical Society https://orcid.org/0000-0002-5227-4009 en_US http://dx.doi.org/10.1103/PhysRevA.87.062310 Physical Review A Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Lupo, Cosmo Pirandola, Stefano Giovannetti, Vittorio Mancini, Stefano Quantum reading capacity under thermal and correlated noise |
| title | Quantum reading capacity under thermal and correlated noise |
| title_full | Quantum reading capacity under thermal and correlated noise |
| title_fullStr | Quantum reading capacity under thermal and correlated noise |
| title_full_unstemmed | Quantum reading capacity under thermal and correlated noise |
| title_short | Quantum reading capacity under thermal and correlated noise |
| title_sort | quantum reading capacity under thermal and correlated noise |
| url | http://hdl.handle.net/1721.1/80324 https://orcid.org/0000-0002-5227-4009 |
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