Entanglement and quantum tomography with top quarks at the LHC
- URL: http://arxiv.org/abs/2003.02280v3
- Date: Mon, 6 Sep 2021 18:00:04 GMT
- Title: Entanglement and quantum tomography with top quarks at the LHC
- Authors: Yoav Afik, Juan Ram\'on Mu\~noz de Nova
- Abstract summary: Entanglement is a central subject in quantum mechanics.
We propose the detection of entanglement between the spins of top-antitop-quark pairs at the LHC.
We show that entanglement can be observed by direct measurement of the angular separation between the leptons arising from the decay of the top-antitop pair.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Entanglement is a central subject in quantum mechanics. Due to its genuine
relativistic behavior and fundamental nature, high-energy colliders are
attractive systems for the experimental study of fundamental aspects of quantum
mechanics. We propose the detection of entanglement between the spins of
top-antitop-quark pairs at the LHC, representing the first proposal of
entanglement detection in a pair of quarks, and also the entanglement
observation at the highest energy scale so far. We show that entanglement can
be observed by direct measurement of the angular separation between the leptons
arising from the decay of the top-antitop pair. The detection can be achieved
with high statistical significance, using the current data recorded during Run
2 at the LHC. In addition, we develop a simple protocol for the quantum
tomography of the top-antitop pair. This experimental technique reconstructs
the quantum state of the system, providing a new experimental tool to test
theoretical predictions. Our work explicitly implements canonical experimental
techniques in quantum information in a two-qubit high-energy system, paving the
way to use high-energy colliders to also study quantum information aspects.
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