Quantum Temporal Superposition: The Case of Quantum Field Theory

Funding

A. B. acknowledges the hospitality of the Institute for Theoretical Physics and the "Nonequilibrium quantum dynamics" group at Universitat Stuttgart, where part of this work was carried out. A. B. also acknowledges financial support from H2020 through the MSCA IF pERFEcTO (Grant Agreement No. 795782). C. B. and E. C. R. acknowledge support from the research platform Testing Quantum and Gravity Interface with Single Photons (TURIS), the Austrian Science Fund (FW'F) through the Projects BeyondC (No. F7113-N48), and the doctoral program Complex Quantum Systems (CoQuS) under Project No. W1210-N25. They acknowledge financial support from the EU Collaborated H2020 FET Project TEQ (Grant No. 766900). C. B. acknowledge financial support from the Austrian-Serbian bilateral scientific cooperation Grant No. 451-03-02141/2017-09/02, Foundational Questions Institute (FQXi), and the Grant No. 61466 from the John Templeton Foundation, as part of the "The Quantum Information Structure of Spacetime (QISS)" Project (giss.fr). C. B. acknowledge support the Austrian Science Fund (FWF) through the projects ZK3 (Zukunftskolleg) and BeyondC (No. F7113-N48). This work was funded by a grant from the Foundational Questions Institute (FQXi) Fund. E. C. R. is supported in part by the Program of Concerted Research Actions (ARC) of the Universite libre de Bruxelles. M. Z. acknowledges funding from ARC through Grants No. DECRA DE180101443 and No. EQuS CE 170100009. L. J. H. and R. B. M. acknowledge support from the Natural Sciences and Engineering Research Council of Canada.