др Џејмс Фулвуд

25. априла 2023.

У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у петак, 28. априла 2023. године у 11 часова на Физичком факултету у Београду, у сали 665, др Џејмс Фулвуд (Школа математичких наука, Шангајски универзитет Јиао Тонг) одржаће предавање:

On Quantum States Over Time


While in relativity theory space evolves over time into a single entity known as spacetime, quantum theory lacks a standard notion of how to encapsulate the dynamical evolution of a quantum state into a single „state over time“. Recently there is an emerging interest in the formulation of such dynamical quantum states, resulting in various approaches to their construction. In our work with Arthur Parzygnat, we have developed a general approach which we have recently shown is equivalent to the pseudo density matrix formalism of Fitzsimons, Jones and Vedral, which was initially introduced to treat temporal and spatial correlations in quantum theory on equal footing. In this talk, we review the general theory of such states over time, and go over some recent applications, such as a dynamical quantum Bayes’ rule, time-reversal for quantum systems, and quantum mechanical world lines. We then conclude with some ideas on how quantum states over time may yield „spacetime states“ associated with a causal set.