Quantum Reading of Digital Memories

Details Quantum Reading of Digital Memories Quantum Reading of Digital Memories

2009-07-20

arxiv.org/abs/0907.3398v4

Physics

Quantum Physics

This document includes both the published Letter and the online Supplemental Material (as Appendix). REVTeX. 25 pages. 17 Figu

Scientific paper

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 non-classical 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 non-trivial applications in the technology of digital memories, such as optical disks and barcodes.

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