Causality in relativistic quantum interactions without mediators
arXiv:2412.16288 · doi:10.1103/PhysRevD.111.085005
Abstract
We analyse the interaction between two quantum systems in spacetime and we compare two possible models to describe it: 1) a fully quantum field theoretical (QFT) description of the coupling of two quantum systems mediated by a quantum field and 2) a quantum-controlled model (qc-model), which is an effectively relativistic direct-coupling in which the interaction of two quantum systems is not mediated by a field with local quantum degrees of freedom. We show that while there are regimes where the qc-model can approximate QFT arbitrarily well, it can suffer from retrocausal effects. We discuss in what regimes those retrocausal predictions of the qc-model are non-negligible and whether they can be used to argue that gravity induced entanglement experiments can reveal genuinely quantum aspects of the gravitational interaction or not.
15 pages, 4 figures, 1 appendix
References in corpus (17)
- A Spin Entanglement Witness for Quantum Gravity
- Gravitationally-induced entanglement between two massive particles is sufficient evidence of quantum effects in gravity
- Quantum Measurement Information as a key to Energy Release from Local Vacuums
- Information transmission without energy exchange
- On two recent proposals for witnessing nonclassical gravity
- Entanglement amplification between superposed detectors in flat and curved spacetimes
- What gravity mediated entanglement can really tell us about quantum gravity
- Long-range entanglement in the Dirac vacuum
- Gravity entanglement, quantum reference systems, degrees of freedom
- Gravitational effects in macroscopic quantum systems: a first-principles analysis
- On the Significance of Interferometric Revivals for the Fundamental Description of Gravity
- Bandlimited Entanglement Harvesting
- Entanglement Harvesting with a Twist
- Superadditivity of channel capacity through quantum fields
- The role of quantum degrees of freedom of relativistic fields in quantum information protocols
- Closed-form expressions for smeared bi-distributions of a massless scalar field: non-perturbative and asymptotic results in relativistic quantum information
- Entanglement is better teleported than transmitted