Quantum reading capacity under thermal and correlated noise
Name
Lupo-2013-Quantum reading capacity under thermal and correlated noise.pdf
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395.8 KB
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Checksum (MD5)
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Author(s)
Lupo, Cosmo
Pirandola, Stefano
Giovannetti, Vittorio
Mancini, Stefano
Date Issued
June 2013
Journal
Physical Review A
Publisher
American Physical Society
Citation
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
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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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.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.87.062310
