Quantum interpretations, causality and quantum computation

Abstract

The interpretation of quantum mechanics continues to be debated, and quantum nonlocality accentuates the puzzle. Quantum interpretations can be classified broadly into two types: realist interpretations, which assert that quantum states describe objective reality (even if hidden or branching), and subjective interpretations, which treat quantum states as observer-dependent information or beliefs about the system. Here we study the implication of quantum interpretations for causal explanations of Bell nonlocal correlations, and show that a given interpretation type carries an inherent commitment to a preferred causal structure. Specifically, we find that realist interpretations entail a classical causal model, and thus require Fine-Tuning to prevent superluminal signaling, while subjective interpretations are found to entail a framework of nonclassical causal models. The implications of our results for one-way quantum computation and computation-based Bell nonlocality are studied.

8 pages, 4 figures

References in corpus (18)

• Quantum algorithm for solving linear systems of equations
• Informational derivation of Quantum Theory
• Probabilistic theories with purification
• An Introduction to QBism with an Application to the Locality of Quantum Mechanics
• Einstein, incompleteness, and the epistemic view of quantum states
• The lesson of causal discovery algorithms for quantum correlations: Causal explanations of Bell-inequality violations require fine-tuning
• A strong no-go theorem on the Wigner's friend paradox
• Generalized Probability Theories: What determines the structure of quantum theory?
• On modifications of Reichenbach's principle of common cause in light of Bell's theorem
• Cyclic Quantum Causal Models
• Bell nonlocality, signal locality and unpredictability (or What Bohr could have told Einstein at Solvay had he known about Bell experiments)
• Generalized probability rules from a timeless formulation of Wigner's friend scenarios
• The computational landscape of general physical theories
• The Inflation Technique Completely Solves the Causal Compatibility Problem
• Classical causal models for Bell and Kochen-Specker inequality violations require fine-tuning
• A "thoughtful" Local Friendliness no-go theorem: a prospective experiment with new assumptions to suit
• Witnessing Non-Classicality in a Simple Causal Structure with Three Observable Variables
• The operational reality of quantum nonlocality