Device-independent quantum reading and noise-assisted quantum transmitters

Roga, Wojciech and Buono, Daniela and Illuminati, Fabrizio (2015) Device-independent quantum reading and noise-assisted quantum transmitters. New Journal of Physics, 17 (013031). 013031. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/17/1/013031)

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Abstract

In quantum reading, a quantum state of light (transmitter) is applied to read classical information. In the presence of noise or for sufficiently weak signals, quantum reading can outperform classical reading by reason of enhanced state distinguishability. Here we show that enhanced quantum efficiency depends on the presence in the transmitter of a particular type of quantum correlations, the discord of response. Different encodings and transmitters give rise to different levels of efficiency. Considering noisy quantum probes, we show that squeezed thermal transmitters with non-symmetrically distributed noise among the field modes yield higher quantum efficiency compared with coherent thermal quantum states. The noise-enhanced quantum advantage is a consequence of the discord of response being a non-decreasing function of increasing thermal noise under constant squeezing, a behavior that leads to increased state distinguishability. We finally show that, for non-symmetric squeezed thermal states, the probability of error, as measured by the quantum Chernoff bound, vanishes asymptotically with increasing local thermal noise with finite global squeezing. Therefore, with fixed finite squeezing, noisy but strongly discordant quantum states with a large noise imbalance between the field modes can outperform noisy classical resources as well as pure entangled transmitters with the same finite level of squeezing.

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• Item metadata

  Item type:	Article
  ID code:	54839
  Dates:	Date Event 20 January 2015 Published 22 December 2014 Accepted
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics
  Depositing user:	Pure Administrator
  Date deposited:	11 Dec 2015 01:47
  Last modified:	08 Apr 2024 22:38
  Related URLs:	Journal or Publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/54839