Seminar @UFF: Marcos César de Oliveira, Aug. 22nd, 11am

Next Friday, August 22nd, at 11:00 am we’ll have another seminar at the Quantum Optics and Quantum Information group at IF-UFF. This time round  we’ll have Marcos César de Oliveira (UNICAMP) talking about “Non-Classicality and Complementarity in two-level systems”. All are welcome to attend! Please find below an abstract for this talk.

When: Friday Aug. 22nd, 11 am, room A5-01, Physics Building at UFF.

Speaker: Marcos Cesar de Oliveira (UNICAMP)

Title: Non-Classicality and Complementarity in two-level systems.

Resumo: The principle of complementarity, introduced by Bohr, relies on the observation that in quantum systems, certainty in the measurement of a fixed physical property precludes certainty in the measurement of a complementary one. The paradigma is the double slit experiment, where complementarity is embodied by the which path information and the observation of interference fringes. In fact it is possible to construct a quasiprobability representation in terms of mutually unbiased bases (MUB) that capture the notion of complementarity in the measurements of a system. States in the convex hull of the MUB set have a positive representation, while those outside necessarily display some negativity and are thus nonclassical in this representation. However, the quasiprobability does not rule out superquantum states. In this talk we discuss those aspects of nonclassicality and complementarity for two-level systems. Particularly, we consider the consequences of hypothetical violations of the principle of complementarity and show that any preparation violating complementarity enables the preparation of a nonsignalling box violating Tsirelson’s bound. Moreover, these superquantum objects could be used to distinguish a plethora of non-orthogonal quantum states and hence enable improved cloning protocols.

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