Making sense of relativistic Wigner friend scenarios: a problem for
unitary accounts of quantum measurements ?
- URL: http://arxiv.org/abs/2310.04167v2
- Date: Fri, 8 Mar 2024 17:41:30 GMT
- Title: Making sense of relativistic Wigner friend scenarios: a problem for
unitary accounts of quantum measurements ?
- Authors: J. Allam and A. Matzkin
- Abstract summary: Wigner-friend scenarios highlight the difficulties inherent to quantum theory when accounting for measurements.
In non-relativistic scenarios, the difficulty is to accommodate unitary evolution for a closed system.
In relativistic scenarios the tensions between quantum theory and relativity induce additional constraints.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Wigner-friend scenarios -- in which external agents describe a closed
laboratory containing a friend making a measurement -- highlight the
difficulties inherent to quantum theory when accounting for measurements. In
non-relativistic scenarios, the difficulty is to accommodate unitary evolution
for a closed system with a definite outcome obtained by the friend. In
relativistic scenarios the tensions between quantum theory and relativity
induce additional constraints. A generic property of relativistic scenarios is
the frame-dependence of state update upon a measurement. Based on a definite
example, we will show that this property leads to inconsistent accounts for
outcomes obtained in different reference frames. We will further argue that
these results point to some fundamental inadequacy when attempting to model
actions taken by a complex agent as unitary operations made on simple
wavefunctions.
Related papers
- Symmetry-protection Zeno phase transition in monitored lattice gauge theories [0.0]
We show the existence of a sharp transition, triggered by the measurement rate, between a protected gauge-theory regime and an irregular regime.
Our results shed light on the dissipative criticality of strongly-interacting, highly-constrained quantum systems.
arXiv Detail & Related papers (2024-05-28T18:18:06Z) - Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system.
This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
arXiv Detail & Related papers (2023-10-04T09:51:00Z) - Measurement events relative to temporal quantum reference frames [49.1574468325115]
We compare two approaches to the Page-Wootters formalism to clarify the operational meaning of evolution and measurements.
We show that for non-ideal clocks, the purified measurement approach yields time non-local, non-unitary evolution.
arXiv Detail & Related papers (2023-08-21T18:26:12Z) - Beyond relationalism in quantum theory: A new indeterminacy-based
interpretation of quantum theory [0.0]
The received view in philosophy and foundations of physics holds that if we reject quantum theory we should adopt a universal interpretation.
I will present an interpretation of this kind called Quantum Environmental Determinacy-based or Quantum En Theory (EnDQT)
I will discuss other independent good reasons for adopting EnQT, including providing a local causal explanation of Bell correlations.
arXiv Detail & Related papers (2023-04-02T19:39:36Z) - Experimental refutation of real-valued quantum mechanics under strict
locality conditions [15.98149438495762]
Physicists describe nature using mathematics as the natural language, and for quantum mechanics, it prefers to use complex numbers.
Recently, it has been shown that a three-party correlation created in entanglement swapping scenarios cannot be reproduced using only real numbers.
Our results violate the real number bound of 7.66 by 5.30 standard deviations, hence rejecting the universal validity of the real-valued quantum mechanics to describe nature.
arXiv Detail & Related papers (2022-01-11T20:00:17Z) - Events in quantum mechanics are maximally non-absolute [0.9176056742068814]
We prove that quantum correlations can be maximally non-absolute according to both quantifiers.
We show that chained Bell inequalities (and relaxations thereof) are also valid constraints for Wigner's experiment.
arXiv Detail & Related papers (2021-12-19T21:15:16Z) - Experimental violations of Leggett-Garg's inequalities on a quantum
computer [77.34726150561087]
We experimentally observe the violations of Leggett-Garg-Bell's inequalities on single and multi-qubit systems.
Our analysis highlights the limits of nowadays quantum platforms, showing that the above-mentioned correlation functions deviate from theoretical prediction as the number of qubits and the depth of the circuit grow.
arXiv Detail & Related papers (2021-09-06T14:35:15Z) - Optimal Adaptive Strategies for Sequential Quantum Hypothesis Testing [87.17253904965372]
We consider sequential hypothesis testing between two quantum states using adaptive and non-adaptive strategies.
We show that these errors decrease exponentially with decay rates given by the measured relative entropies between the two states.
arXiv Detail & Related papers (2021-04-30T00:52:48Z) - Conditional probabilities of measurements, quantum time and the Wigner's
friend case [0.0]
conditional probabilities are derived for subsequent measurements in the non-relativistic regime.
One-time conditional probabilities are unambiguously derived via the Gleason-Bush theorem.
arXiv Detail & Related papers (2021-03-16T08:13:00Z) - Einselection from incompatible decoherence channels [62.997667081978825]
We analyze an open quantum dynamics inspired by CQED experiments with two non-commuting Lindblad operators.
We show that Fock states remain the most robust states to decoherence up to a critical coupling.
arXiv Detail & Related papers (2020-01-29T14:15:19Z) - A strong no-go theorem on the Wigner's friend paradox [0.0]
We prove that if quantum evolution is controllable on the scale of an observer, then one of 'No-Superdeterminism', 'Locality' or 'Absoluteness of Observed Events' must be false.
We show that although the violation of Bell-type inequalities in such scenarios is not in general sufficient to demonstrate the contradiction between those three assumptions, new inequalities can be derived in a theory-independent manner.
arXiv Detail & Related papers (2019-07-12T08:09:44Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.