The quantum mechanical notion of unobservable causal loop and the anthropic principle

• URL: http://arxiv.org/abs/2103.03173v2
• Date: Wed, 1 Nov 2023 05:13:02 GMT
• Title: The quantum mechanical notion of unobservable causal loop and the anthropic principle
• Authors: Giuseppe Castagnoli
• Abstract summary: It can be argued that the ordinary description of the reversible quantum process between two one-to-one correlated measurement outcomes is incomplete. We show that it is the quantum superposition of unobservable time-symmetrized instances whose causal structure is completely defined.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: It can be argued that the ordinary description of the reversible quantum process between two one-to-one correlated measurement outcomes is incomplete because, by not specifying the direction of causality, it allows causal structures that violate the time symmetry that is required of a reversible process. This also means that it can be completed simply by time-symmetrizing it, namely by requiring that the initial and final measurements evenly contribute to the selection of their correlated pair of outcomes. This leaves the description unaltered but shows that it is the quantum superposition of unobservable time-symmetrized instances whose causal structure is completely defined. Each instance consists of a causal loop: the final measurement that changes backwards in time the input state of the unitary transformation that leads to the state immediately before it. In former works, we have shown that such loops exactly explain the quantum computational speedup and quantum nonlocality. In this work we show that they lead to a completion of the anthropic principle that allows a universe evolution with quantum speedup.

Related papers

• Measuring the Evolution of Entanglement in Compton Scattering [101.11630543545151]
  The behavior of quantum entanglement during scattering is identical to the behavior of initially classically correlated photons up to a constant factor equal to two. Our dedicated experiment with photons confirms these results and explains the "Puzzle of Decoherence" observed recently.
  arXiv  Detail & Related papers  (2024-06-20T14:21:23Z)
• Time and event symmetry in quantum mechanics [0.0]
  We find that recent time symmetric interpretations of quantum mechanics fail to respect event symmetry. We then use this model to resolve conceptual paradoxes with time symmetric quantum mechanics within an all-at-once', atemporal picture.
  arXiv  Detail & Related papers  (2023-12-21T01:59:21Z)
• Indefinite order in the interface of quantum mechanics and gravity [0.0]
  We discuss the notion of indefinite order, which first appears in an abstract generalization of Quantum Theory. We present how scenarios involving gravity in low energies could lead to indefinite order.
  arXiv  Detail & Related papers  (2023-10-03T01:16:27Z)
• Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure [49.1574468325115]
  We study the entanglement of a single particle under continuous measurements. We find that the entanglement at intermediate time scales shows the same qualitative behavior as a function of the measurement strength.
  arXiv  Detail & Related papers  (2023-04-06T09:45:11Z)
• Step-by-step derivation of the algebraic structure of quantum mechanics (or from nondisturbing to quantum correlations by connecting incompatible observables) [0.0]
  This paper provides a step-by-step derivation of the quantum formalism. It helps us to understand why this formalism is as it is.
  arXiv  Detail & Related papers  (2023-03-08T19:27:24Z)
• Non-Abelian symmetry can increase entanglement entropy [62.997667081978825]
  We quantify the effects of charges' noncommutation on Page curves. We show analytically and numerically that the noncommuting-charge case has more entanglement.
  arXiv  Detail & Related papers  (2022-09-28T18:00:00Z)
• Consistency in the description of quantum measurement: Quantum theory can consistently describe the use of itself [8.122270502556372]
  I propose a slight addition to standard textbook quantum mechanics, in the form of two rules, which avoids the paradox. The first specifies when a given quantum dynamics can be interpreted as a measurement. The second requires that a joint context be used to determine whether several different dynamical evolutions can all be interpreted as measurement.
  arXiv  Detail & Related papers  (2021-07-05T18:00:15Z)
• Quantum indistinguishability through exchangeable desirable gambles [69.62715388742298]
  Two particles are identical if all their intrinsic properties, such as spin and charge, are the same. Quantum mechanics is seen as a normative and algorithmic theory guiding an agent to assess her subjective beliefs represented as (coherent) sets of gambles. We show how sets of exchangeable observables (gambles) may be updated after a measurement and discuss the issue of defining entanglement for indistinguishable particle systems.
  arXiv  Detail & Related papers  (2021-05-10T13:11:59Z)
• Unobservable causal loops as a way to explain both the quantum computational speedup and quantum nonlocality [0.0]
  We consider the reversible processes between two one-to-one correlated measurement outcomes. We argue that the quantum description of these processes mathematically describes the correlation but leaves the causal structure that physically ensures it free. Time-symmetrization leaves the ordinary quantum description but shows that it is the quantum superposition of unobservable time-symmetrization instances.
  arXiv  Detail & Related papers  (2020-11-30T10:42:35Z)
• Emergence of Constructor-based Irreversibility in Quantum Systems: Theory and Experiment [0.0]
  We show that irreversibility in a universe with time-reversal-symmetric laws is compatible with quantum theory's time reversal symmetric laws. We exploit a specific model, based on the universal quantum homogeniser, realised experimentally with high-quality single-photon qubits.
  arXiv  Detail & Related papers  (2020-09-30T12:57:39Z)
• Entropic Uncertainty Relations and the Quantum-to-Classical transition [77.34726150561087]
  We aim to shed some light on the quantum-to-classical transition as seen through the analysis of uncertainty relations. We employ entropic uncertainty relations to show that it is only by the inclusion of imprecision in our model of macroscopic measurements that we can prepare a system with two simultaneously well-defined quantities.
  arXiv  Detail & Related papers  (2020-03-04T14:01:17Z)

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.