Archives: Events

Speaker: Rafael Wagner (University of Minho) Abstract Certifying quantum devices and their ability to generate nonclassical data is a crucial task to calibrate and benchmark near-term quantum hardware. In this presentation I will discuss some recent efforts of using nonclassical relational information, provided by the measurement of Bargmann invariants, to witness nonclassicality. In more detail, […]

Speaker: Seungbeom Chin (Sungkyunkwan University & ICTQT) Abstract Heralded entanglement generated among identical particles is a useful resource for quantum computations, as heralded schemes distinguish experimental runs producing target states without direct measurement. Nonetheless, these heralded schemes generally entail the incorporation of supplementary particles and modes, thus amplifying the design intricacy. In response to this […]

Speaker: Jurij Volčič (Drexel University, United States) Abstract Self-testing is a powerful certification of quantum systems relying on measured, classical statistics. This talk considers self-testing in bipartite Bell scenarios with small number of inputs and outputs, but with quantum states and measurements of arbitrarily large dimension. Firstly, it is shown that every maximally entangled state can […]

Speaker: Máté Farkas (University of York) Abstract Device-independent quantum key distribution allows for proving the security of a shared cryptographic key between two distant parties with potentially untrusted devices. The security proof is based on the measurement outcome statistics (correlation) of a Bell experiment, and security is guaranteed by the laws of quantum theory. While it […]

Speaker:  Michał Oszmaniec (Center for Theoretical Physics PAS/ NASK) Abstract In quantum theory general measurements are described by so-called Positive Operator-Valued Measures (POVMs). In this work we show that in d-dimensional quantum systems an application of depolarizing noise with constant (independent of d) visibility parameter makes any POVM simulable by a randomized implementation of projective […]

Speaker: Dariusz Chruscinski (Nicolaus Copernicus University) Abstract In most realistic situations a quantum system is never perfectly isolated and has to be considered as an open quantum system: it is coupled to an environment that induces decoherence and dissipation. These phenomena can not be described within the standard Schroedinger unitary evolution. In my talk I […]

Speaker: Roberto Baldijão (ICTQT - Univerisity of Gdańsk) Abstract In this talk, I will present two project ideas I think will be nice to work on. The first idea is to analyze Objectivity of Observables in the framework of generalized probabilistic theories (GPTs). Objectivity of Observables was first proven by Brandão, Piani and Horodecki for […]

Speaker: Gábor Drótos (Atomki, Debrecen, Hungarian Academy of Sciences) Abstract Self-testing is a powerful method for certifying quantum systems. Initially proposed in the device-independent (DI) setting, self-testing has since been relaxed to the semi-device-independent (semi-DI) setting. We focus on the self-testing of a specific type of non-projective qubit measurements belonging to a one-parameter family, using […]

Speaker: Sophie Egelhaaf (Université de Genève) Abstract Bipartite low dimensional entanglement has been studied extensively. However, many findings cannot be extrapolated to multiple parties and moreover, increasing the dimensions of the systems adds complexity to the entanglement structure. We are interested in characterising the degree of high-dimensional entanglement, specifically focusing on various multipartite quantum steering […]

Speaker: Owidiusz Makuta (CFT-PAS) Abstract The conventional definition of nonlocality pertains solely to two subsystems, which falls short in fully describing the potential of quantum mechanics observed in multipartite systems. This role is better fulfilled by a variant of nonlocality called Genuine Multipartite NonLocality (GMNL). However, as researchers delved deeper into the concept of GMNL, an […]