Quantum field theory cannot provide faster-than-light communication

Angelo Bassi, G. C. Ghirardi

G. C. Ghirardi, T. Weber

J. Finkelstein, Henry Pierce Stapp

Eduardo Martín-Martínez

We analyze the constraints that causality imposes on some of the particle detector models employed in quantum field theory in general and, in particular, on those used in quantum optics (or superconducting circuits) to model atoms interacting with light. Namely, we show that disallowing faster-than-light communication can impose severe constraints on the applicability of particle detector models in three different common scenarios: (1) when the detectors are spatially smeared, (2) when a UV cutoff is introduced in the theory and (3) under one of the most typical approximations made in quantum optics: the rotating-wave approximation. We identify the scenarios in which the models' causal behavior can and cannot be cured.

Mr Yihe Xue

Abstract Quantum entanglement is the core of quantum physics, which is a part of theoretical physics. This theory is once assumed to be the hope of faster-than-light communication. If the technique is achievable, it would be a great breakthrough in the field of physics. I went through the development history of quantum entanglement and conclude it, which is the main stuff I write about in this article, as it involves many differing and sometimes contradictory opinion of physicists. The main part of my research depends on articles about quantum mechanics. I read them first and extracted the relevant contents to form a complete timeline of development. During my exploration, a conclusion of faster-than-light communication is impossible is arose.