4 papers · 1 filter
No-go theorems for pointwise-defined spinorial quantum fields
Samuel Fedida
We extend and strengthen no-go results on pointwise-defined quantum fields to cover general spinors. We show that the weak continuity of quantum fields rules out equal-time canonic…
The thermodynamics of readout devices and semiclassical gravity
Samuel Fedida, Adrian Kent
We analyse the common claim that nonlinear modifications of quantum theory necessarily violate the second law of thermodynamics. We focus on hypothetical extensions of quantum theo…
Mixture equivalence principles and post-quantum theories of gravity
Samuel Fedida, Adrian Kent
We examine the mixture equivalence principle (MEP), which states that proper and improper mixed states with the same density matrix are always experimentally indistinguishable, and…
Knot invariants and indefinite causal order
Samuel Fedida, Anne-Catherine de la Hamette, Viktoria Kabel +1
We explore indefinite causal order between events in the context of quasiclassical spacetimes in superposition. We introduce several new quantifiers to measure the degree of indefi…