Quantum states of light have been shown to be able to provide an advantage over classical ones in a variety of tasks. Our work shows how practical enhancement can be obtained, using quantum correlations, in the readout of classical information from a digital memory. The quantum advantadge is preserved also in a more complex tasks, namely pattern recognition, highlighting the potential for applications of the techniques proposed.
The protocol of quantum reading refers to the quantum enhanced retrieval of information from an optical memory, whose generic cell stores a bit of information in two possible lossy channels. In the following we analyze the case of a particular class of optical receiver, based on photon counting measurement, since they can be particularly simple in view of real applications. We show that a quantum advantage is achievable when a transmitter based on two-mode squeezed vacuum (TMSV) states is combined with a photon counting receiver, and we experimentally confirm it. In this paper, after introducing some theoretical background, we focus on the experimental realisation, describing the data collection and the data analysis in detail.
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