alexa Quantum reading of a classical digital memory.
Physics

Physics

Journal of Lasers, Optics & Photonics

Author(s): Pirandola S

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Abstract 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. This article was published in Phys Rev Lett and referenced in Journal of Lasers, Optics & Photonics

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