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Quantum Temporal Superposition: The Case of Quantum Field Theory
Laura J Henderson1,2,3, Alessio Belenchia4, Esteban Castro-Ruiz5,6,7
1Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
Physical Review Letters
|October 9, 2020
Summary
Using quantum-controlled particle detectors in superposition reveals field correlations inaccessible to classical methods. This quantum interference enables new ways to extract entanglement and mutual information from quantum fields.
Area of Science:
- Quantum Field Theory
- Quantum Information Science
Background:
- Quantum field theory describes reality through field correlations between spacetime points.
- Particle detectors are used to probe these correlations by locally coupling to quantum fields.
Purpose of the Study:
- To investigate the impact of using quantum-controlled superpositions of particle detectors at different spacetime points to probe field correlations.
- To explore the consequences for information-theoretic quantities like entanglement and mutual information.
Main Methods:
- Utilizing quantum interference effects with a superposition of detectors.
- Analyzing the information gained on field correlations beyond classical accessibility.
Main Results:
- Quantum interference allows two detectors to access field correlations not otherwise obtainable.
- This method provides a novel pathway for extracting entanglement and mutual information from quantum fields.
Conclusions:
- Quantum-controlled superpositions of particle detectors offer enhanced capabilities for probing quantum fields.
- This technique allows for entanglement extraction in scenarios previously considered impossible, with significant implications for quantum information science.
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