Genuinely quantum states of light can be distinguished via the criterion proposed in the 1960s by Glauber and Sudarshan: so-called classical states in optics are those obtained as probabilistic mixtures of coherent states. Any other state is called nonclassical and has the potential to be a resource for quantum-enhanced information processing. In this talk, I will present recent work that places nonclassicality on a solid footing within modern quantum information theory. I will describe a framework in which nonclassical states are viewed as valuable commodities in a laboratory where only linear elements are available. This setting motivates novel quantifiers of nonclassicality and leads to fundamental constraints on the ability of linear optics to process nonclassical states.
Benjamin Yadim / University of Nottingham
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