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Related Experiment Video

Updated: Jul 1, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Bell's theorem for temporal order.

Magdalena Zych¹, Fabio Costa², Igor Pikovski^3,4,5

¹Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, St. Lucia, QLD, 4072, Australia. m.zych@uq.edu.au.

Nature Communications

|August 23, 2019

Summary

This summary is machine-generated.

Quantum mechanics and general relativity present conflicting views of time. This study shows how quantum entanglement can entangle temporal orders, challenging classical causality and enabling impossible tasks.

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Area of Science:

Quantum physics
General relativity
Quantum gravity

Background:

Time is treated differently in quantum mechanics (fixed order) and general relativity (matter-influenced order).
A quantum description of matter suggests non-classical temporal order, a scenario not yet theorized.
Reconciling these views is crucial for a unified theory of physics.

Purpose of the Study:

To describe a scenario with non-classical temporal order.
To explore the implications of quantum mechanics on the nature of time.
To investigate the potential for entanglement of temporal orders.

Main Methods:

A thought experiment involving a massive body in a spatial superposition.
Analysis of how this setup leads to entanglement of temporal orders.
Demonstration of a task impossible under classical temporal order.

Main Results:

Entanglement of temporal orders between time-like events was demonstrated.
A Bell inequality was violated, a feat impossible under local classical temporal order.
This implies temporal order cannot be described by pre-defined local variables.

Conclusions:

Classical notions of causal structure are incompatible with quantum mechanics and general relativity.
Quantum entanglement fundamentally alters the nature of temporal order.
This work provides a framework for understanding non-classical time.