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Generalized quantum measurement in spin-correlated hyperon-antihyperon decays
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abstract
The rapid developments of Quantum Information Science (QIS) have opened up new avenues for exploring fundamental physics. Quantum nonlocality, a key aspect for distinguishing quantum information from classical one, has undergone extensive examinations in particles' decays through the violation of Bell-type inequalities. Despite these advancements, a comprehensive framework based on quantum information theory for particle interaction is still lacking. Trying to close this gap, we introduce a generalized quantum measurement description for decay processes of spin-1/2 hyperons. We validate this approach by aligning it with established theoretical calculations and apply it to the joint decay of correlated $\Lambda\bar{\Lambda}$ pairs. We employ quantum simulation to observe the violation of CHSH inequalities in hyperon decays. Our generalized measurement description is adaptable and can be extended to a variety of high energy processes, including decays of vector mesons, $J/\psi,\psi(2S)\rightarrow\Lambda\bar{\Lambda}$, in the Beijing Spectrometer III (BESIII) experiment at the Beijing Electron Positron Collider (BEPC). The methodology developed in this study can be applied to quantum correlation and information processing in fundamental interactions.
Forward citations
Cited by 6 Pith papers
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Quark-antiquark entanglement entropy in quarkonium is derived from light-front wave functions, reduces to the Shannon entropy of TMDs, and shows strong polarization dependence for spin-1 mesons.
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Using BLFQ proton wave functions, the authors compute parton spin and momentum entanglement and report that a dynamical gluon enhances quark entanglement.
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Entanglement redistribution of hyperon-antihyperon pair via sequential decay
In e+e−→ψ→Ξ(→Λπ)Ξ̄(→Λ̄π), the ΛΛ̄ pair's concurrence and negativity can decrease relative to the mother pair yet stay nonzero except at θ=0 and π, while quantum discord can always increase.
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Manipulating Bell nonlocality and entanglement in polarized electron-positron annihilation
Polarized lepton beams can tune hyperon-antihyperon entanglement and Bell nonlocality, with transverse polarization capable of producing maximally entangled pairs.
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Helicity correlation of neighboring dihadron
The helicity correlation of two neighboring hadrons is driven by QCD evolution from the longitudinal spin-transfer function, offering a new unpolarized-collision observable for spin physics.
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