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Quantum information processing with non-classical light

Edo Waks A

Published Jan 1, 2003• 1 citation
OpenAlex

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Quantum non-classicality is not only a fundamental feature which shows the solely quantum character of an emitted photon, but is also necessary for modern applications based on the quantum character of light like quantum information processing [1]. The usual way to show that a light source is non-classical is to measure its auto-correlation [2]. In our work instead we used a different criterion developed in [3] which puts a bound on states that cannot be expressed as a mixture of coherent states. With the same measurement technique we have already proven the non-Gaussianity of the photon [4] using a similar criterion [5,6].
Systems displaying strong non-linear response at low light level have recently drawn attention as they offer opportunities to engineer interactions between single photons [1]. This would for example allow us to overcome the probabilistic operation of photonic logical gates imposed by linear quantum processing and reach the deterministic regime, an outstanding goal for quantum information processing with light. Interfacing quantum light with a highly non-linear system may enable the implementation of deterministic Bell State measurements, which would significantly help scaling up quantum networks.