Quantum Temporal Superposition: the case of QFT
Creators
- 1. Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
- 2. Centre for Theoretical Atomic, Molecular, and Optical Physics, School of Mathematics and Physics, Queens University, Belfast BT7 1NN, United Kingdom
- 3. Institute for Quantum Optics and Quantum Information (IQOQI-Vienna), Austrian Academy of Sciences, Vienna, Austria.
- 4. Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, St Lucia, QLD 4072, Australia
- 5. Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
- 6. Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
Description
Quantum field theory is completely characterized by the field correlations between spacetime
points. In turn, some of these can be accessed by locally coupling to the field simple quantum
systems, a.k.a. particle detectors. In this work, we consider what happens when a quantumcontrolled
superposition of detectors at different space-time points is used to probe the correlations
of the field. We show that, due to quantum interference effects, two detectors can gain information
on field correlations which would not be otherwise accessible. This has relevant consequences for
information theoretic quantities, like entanglement and mutual information harvested from the field.
In particular, the quantum control allows for extraction of entanglement in scenarios where this is
otherwise provably impossible.
Files
Quantum Temporal Superposition.pdf
Files
(3.6 MB)
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