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From the same journal

Quantum Reading of a Classical Digital Memory

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Publication details

JournalPhysical Review Letters
DatePublished - 2 Mar 2011
Issue number9
Number of pages4
Original languageEnglish


We consider a basic model of digital memory where each cell is composed of a reflecting medium with two possible reflectivities. By fixing the mean number of photons irradiated over each memory cell, we show that a nonclassical source of light can retrieve more information than any classical source. This improvement is shown in the regime of few photons and high reflectivities, where the gain of information can be surprising. As a result, the use of quantum light can have nontrivial applications in the technology of digital memories, such as optical disks and barcodes.

Bibliographical note

GS citations 31 in one year since publication.
Extensive media coverage.
High-impact 4-page letter plus 21-page Supplementary Materials.

    Research areas

  • Quantum information, Quantum technology, Quantum entanglement, Optical memories, Non classical states, Quantum optics, Hyphotesis testing, Data storage, Gaussian states, Gaussian channels, Einstein Podolsky Rosen correlations, Non locality

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