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Summary
The paper discusses measuring quantum discord at the LHC, specifically in the top anti-top quantum state. It explores two approaches: the decay method and the kinematic method, and highlights the subtleties associated with measuring discord for reconstructed quantum states at colliders.
Highlights
- Quantum discord is a measure of quantum correlations beyond entanglement.
- The decay method and kinematic method are used to study the top anti-top system.
- The kinematic method is simpler and more encouraging, with sensitivity improved by almost an order of magnitude.
- The study offers the first fine-grained look at quantum behavior for LHC physics.
- Quantum discord is projected to be measurable with a precision of approximately 5% using the decay method and sub-percent levels using the kinematic method.
- The presence of CP violation in tt¯production is manifested by D(ρ) ̸= D(ρ).
- The study expands the toolkit for quantum information studies in particle physics.
Key Insights
- The paper introduces the concept of quantum discord as a measure of quantum correlations beyond entanglement, which can be non-zero even for separable states.
- The authors derive compact closed-form formulae for quantum discord in the helicity and beam bases, making it possible to compute discord efficiently in key regions of phase space.
- The study highlights the importance of careful event selection to ensure meaningful measurements of quantum discord, as the set of zero discord states is not a convex set.
- The kinematic method is shown to be more precise than the decay method, with a predicted precision of approximately 2% using current data.
- The authors discuss the potential for future investigations of quantum discord, including the study of CP-violation effects and the exploration of other quantum information measures.
- The study demonstrates the feasibility of exploring quantum information at colliders, opening up new avenues for research in particle physics.
- The results have implications for our understanding of quantum mechanics and its applications in high-energy physics.
Mindmap
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Citation
Han, T., Low, M., McGinnis, N., & Su, S. (2024). Measuring Quantum Discord at the LHC (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2412.21158