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Prof. Dieter Schuch (Goethe-Universität Frankfurt am Main)25/06/2018, 10:15For quadratic Hamiltonians, the time-dependent Schrödinger equation possesses Gaussian wave packets as exact solutions. They are completely determined by two parameters, the maximum and the width, where both can be time-dependent. The time-dependence of the maximum is determined by the classical Newtonian equation of motion; the width obeys a complex quadratically nonlinear Riccati equation or...Go to contribution page
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Prof. Antonello Scardicchio (ICTP - International Centre for Theoretical Physics- Trieste)25/06/2018, 11:30Abstract: I will review some recent results on ergodicity breaking in many-body systems due to quantum effects. I will underline the similarities and differences with ergodicity breaking in spin glasses, in particular looking at the random energy model, the p-spin model and the Edwards-Anderson spin glass on the Bethe lattice endowed with quantum dynamics.Go to contribution page
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Prof. Luigi Martina (Universita' del Salento - Lecce)25/06/2018, 12:15Within the framework of Oseen-Frank theory, we analyse the static configurations for chiral liquid crystals. In particular, we find numerical solutions for localised axisymmetric states in confined chiral liquid crystals with weak homeotropic anchoring at the boundaries. These solutions describe the distortions of two-dimensional skyrmions, known as either textit{spherulites}...Go to contribution page
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Prof. Massimo Blasone (Università di Salerno)25/06/2018, 15:30In the attempt to find a deterministic description of quantum systems, ’t Hooft proposed the idea that deterministic degrees of freedom could operate at very high energy scales (e.g. Planck scale) and ordinary quantum mechanics would appear as a result of an information loss process. This implies the existence of “beables”, i.e. ontological (commuting) operators which, after...Go to contribution page
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Ms Natalia Sánchez Kuntz (ICN, UNAM)25/06/2018, 16:15This talk is around the discussion of the nature of the quantum state: is the quantum state an ontological description of the system or is it just an epistemological tool for prediction? In this talk I will make a revision of the PBR theorem; through this I will prove that in order to conclude that a certain quantum state is ontological, by carrying out the demonstration of the PBR...Go to contribution page
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Mr Hans Cruz Prado (Goethe Universität Frankfurt am Main)25/06/2018, 17:30We review the concept of dissipation from quantum to classical systems, proving that it does not make sense to say that a system is "conservative" or "dissipative" per se because dissipation is a relational concept. In this spirit, we introduce a "descomposition principle" that allows describe “dissipative” systems in terms of “Contact Lagrangian structures”.Go to contribution page
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Elisa Ercolessi (Univ. Bologna & INFN)26/06/2018, 09:30We will discuss a variant of the Schwinger model that describes 1+1 QED which admits symmetry-protected phases. We will show the appearance of such a phase via both bosonization and DMRG calculations.Go to contribution page
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Paolo Facchi (BA)26/06/2018, 10:15It is commonly claimed that only Hamiltonians with a spectrum unbounded both above and below can give purely exponential decay. Because such Hamiltonians have no ground state, they are considered unphysical. Here we show that Hamiltonians that are bounded below can give purely exponential decay. This is possible when, instead of looking at the global survival probability, one considers a...Go to contribution page
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Prof. Rafael D. Sorkin (Perimeter Institute for Theoretical Physics)26/06/2018, 11:30Why should (and why can) the path integral serve as the basis for quantum theory (and quantum gravity)Go to contribution page
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Mr Giovanni Gramegna (Università degli Studi di Bari, INFN)26/06/2018, 12:15We show that the evolution of a quantum system can be controlled using two different procedures, one hinging upon a strong continuous coupling with an external control potential and the other consisting in the application of instantaneous unitary kicks to the system with high frequency, yielding a "bang-bang evolution". In both cases the Hilbert space is partitioned in subspaces among which...Go to contribution page
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Davide Lonigro (BA)26/06/2018, 15:30We show that the single-excitation interaction of a family of n qubits with a structured boson field can be effectively modeled by a singular finite-rank perturbation Friedrichs-Lee model of a Hamiltonian with n eigenvalues; the resulting perturbation preserves the absolutely continuous spectrum but drastically modifies the singular spectrum. This structure is shown to be universal in the...Go to contribution page
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Domenico Pomarico (BA)26/06/2018, 16:15Systems of atoms coupled to a single or few waveguide modes provide the testbed for physically and practically interesting interference effects. We consider the dynamics of a pair of atoms, approximated as two-level quantum emitters, coupled to a linear guided mode. In particular, we analyze the evolution of an initial state in which both atoms are excited, which is expected to decay into an...Go to contribution page
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Giovanni Scala (BA)26/06/2018, 17:30We discuss the presence of a nontrivial emission at the Rabi frequency in the Jaynes-Cummings model (JC) with broken symmetry in the diagonal terms of dipole moment. JC is a theoretical model which describes the oscillating behavior of a two-level quantum system in a cavity, interacting with one resonant mode of the electromagnetic radiation at an optical frequency. Analytical results for the...Go to contribution page
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Prof. Fernando Falceto (Universidad de Zaragoza)27/06/2018, 09:30We discuss the Heisenberg equation for operators that do not preserve the boundary conditions for the domain of the Hamiltonian. We show that it acquires an anomalous term that depends only on the boundary values. We briefly review the theory of selfadjoint extensions of symmetric operators where the above mentioned anomalous term plays the key role. We show how the previous results...Go to contribution page
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Florio Maria Ciaglia (INFN-Sezione di Napoli, and Max Planck Institute for Mathematics in the Sciences Leipzig)27/06/2018, 10:15An alternative formulation of Quantum Mechanics based on selective measurements due to Schwinger is reviewed. It is argued that the mathematical structure behind Schwinger’s “Symbolism of Atomic Measurements” is that of a groupoid. In this framework, both the Hilbert space (Schrödinger picture) and the C*-algebra (Heisenberg picture) of the system turn out to be derived concepts, that is, they...Go to contribution page
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Prof. Manolo Asorey (Universidad de Zaragoza)27/06/2018, 11:30We will review some basic aspects of the covariant approach to quantum mechanics in a framework free of ultraviolet singularities. Some higher derivative field theories are also free of ultraviolet singularities and ghosts. They seem to provide a safe framework also for quantum field theories. However, we point out that they undergo hidden pathologies and in spite of the absence of...Go to contribution page
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Dr Antonella De Pasquale (University of Florence, Department of Physics and Astronomy)27/06/2018, 12:15We provide a dynamical description of the quantum measurement process by framing it into the mindset of the theory of open quantum systems. The system and the measurement apparatus are considered as interacting quantum objects, such that the former “steals” information from the latter. In this formalism, after a given amount of time, the measurement process emerges in the form of an entangled...Go to contribution page
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Saverio Pascazio (BA)27/06/2018, 15:30An excited atom in free space decays towards its ground state through spontaneous emission. Boundary conditions and artificial dimensional reduction drastically modify this picture, enhancing or inhibiting (sometimes hindering) decay. We investigate the behaviour of two quantum emitters (two-level atoms) embedded in a linear waveguide, in a quasi-one-dimensional configuration. We focus on...Go to contribution page
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Dr Goffredo Chirco (Max Planck Institute for Gravitational Physics (Albert Einstein Institute)-Potsdam)27/06/2018, 16:15I consider the extension of Souriau's formalism of Lie group thermodynamics to the case of constrained hamiltonian systems and gauge theories, in the perspective of a general covariant reformulation of statistical mechanics compatible with the conceptual framework of General Relativity.Go to contribution page
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Mr Alessandro Carotenuto (SISSA)27/06/2018, 17:30Jordan algebras provide suitable ground to formalize properties of a finite dimensional quantum geometry. Recently M. Dubois-Violette proposed an interpretation both of quark-lepton symmetry and of the existence of three generations of particles in terms of rapresentations of the exceptional Jordan algebra. During this talk I shall review such a theory and then present some recent results...Go to contribution page
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Prof. Dariusz Chru ́sci ́nski (Nicolaus Copernicus University Torun)29/06/2018, 09:30We analyze the relation between CP-divisibility and the lack of information back flow for an arbitrary not necessarily invertible dynamical map [1,2,3]. It is well known that CP-divisibility always implies lack of information back flow. Moreover, these two notions are equivalent for invertible maps. We show that for a map which is not invertible the lack of information back flow always...Go to contribution page
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Mr Marco Laudato (Università dell'Aquila)29/06/2018, 10:15The so-called q-z-Rényi Relative Entropies provide huge two parameters family of relative entropies which include almost all well-known examples of quantum relative entropies for suitable values of the parameters. In this talk we consider a log-regularized version of this family and use it as a family of potential functions to generate covariant (0,2) symmetric tensors on the space of...Go to contribution page
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Alessandro Zampini (INFN)29/06/2018, 11:30In this talk we shall describe the setting and the main result of a joint recent work with Patrizia Vitale and Giuseppe Marmo. For a class of algebras, whose non commutativity is related to three dimensional Lie algebras, we show how to induce, upon a suitable reduction from a set of derivations for the 4D Moyal space, a four dimensional calculus realised in terms of both inner and outer...Go to contribution page
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Dr Zeinab Kordi (INFN, Sezione di Bari, I-70126 Bari, Italy)29/06/2018, 12:15In this talk, the superluminal and slow light propagation in quantum system will be reviewed theoretically and experimentally. We will show how the medium response to light such as absorption and dispersion could be controlled by the intensity of applied fields. In fact the probe pulse propagation can be switched from subluminal to superluminal by changing the intensity of the coupling fieldGo to contribution page
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Prof. Giuseppe Marmo (Università FEDERICO II e INFN di NAPOLI)29/06/2018, 17:30
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