A factorization framework and two-qubit description allow photon pairs at lepton colliders to be treated as qubits for measuring Bell inequality violation, quantum discord, and nonstabilizerness using Belle data.
Spin Correlation and Quantum Entanglement of Fermion Pairs in Transversely Polarized $e^-e^+$ Collisions
9 Pith papers cite this work. Polarity classification is still indexing.
9
Pith papers citing it
abstract
We systematically study the spin correlations and quantum entanglement in transversely polarized electron-positron collisions. We find that the $s$-channel QED process $e^-e^+\to f\bar f$ produces a maximally entangled state in the entire phase space when the initial beams are transversely polarized, while the quantum magic varies in different phase space points for the maximally entangled Bell states. For electroweak processes, the spin configuration of final states depends on chiral couplings, and the entanglement is also greatly enhanced by transverse polarization as in the QED process. For Bhabha scattering with additional $t$-channel contributions, the transverse polarization still increases the final state entanglement, although with some dilution. The sensitive dependence of final spin states on the transverse polarization makes the beam polarization a powerful tool for generating and controlling quantum entanglement in collider experiments, opening up new opportunities for quantum information studies at high-energy colliders.
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hep-ph 9years
2026 9roles
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background 4representative citing papers
Analysis of ~10 billion muon decays from Fermilab g-2 data shows 5.5σ Leggett-Garg inequality violation via reconstructed temporal polarization correlators.
Spin-flavor entanglement in Lambda_b to Lambda D decays supplies a method to extract the CKM weak phase gamma with uncertainty scaling as 1 over the Wootters concurrence.
Computes entanglement negativities for the tripartite spin system in e+e- -> ttZ and projects that collective entanglement is accessible but genuine multipartite entanglement has limited sensitivity at a polarized ILC with expected luminosity.
Semi-leptonic h→VV* decays retain an effective two-qutrit quantum description under NLO QCD and electroweak corrections, unlike the fully leptonic h→4ℓ channel.
Magic distributions are computed for EW processes (reproducing QED at low energy, new at high energy/Z resonance) and dark-sector scatterings, reaching maximal magic at mass ratios m_f/m_χ → 0 and → 1.83929.
Polarized lepton beams control quantum discord and steering in hyperon-antihyperon pairs from e+e- annihilation, with discord persisting in separable states via transverse polarization.
Hard final-state radiation measurably destroys the spin entanglement of fermion-antifermion pairs, and the effect should already be visible in LHC ttbar+jet and Belle II tau+tau-gamma data.
citing papers explorer
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Quantum Information of Photon Pairs at Lepton Colliders
A factorization framework and two-qubit description allow photon pairs at lepton colliders to be treated as qubits for measuring Bell inequality violation, quantum discord, and nonstabilizerness using Belle data.
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Leggett-Garg Inequality Violation in Muon $g-2$ Experiments
Analysis of ~10 billion muon decays from Fermilab g-2 data shows 5.5σ Leggett-Garg inequality violation via reconstructed temporal polarization correlators.
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Spin-flavor entanglement in $\Lambda_b \to \Lambda D$ and weak phase extraction
Spin-flavor entanglement in Lambda_b to Lambda D decays supplies a method to extract the CKM weak phase gamma with uncertainty scaling as 1 over the Wootters concurrence.
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Tripartite Entanglement in $e^+ e^- \to t \bar{t} Z$
Computes entanglement negativities for the tripartite spin system in e+e- -> ttZ and projects that collective entanglement is accessible but genuine multipartite entanglement has limited sensitivity at a polarized ILC with expected luminosity.
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Quantum Tomography and Entanglement in Semi-Leptonic $h\to VV^*$ Decays at Higher Orders
Semi-leptonic h→VV* decays retain an effective two-qutrit quantum description under NLO QCD and electroweak corrections, unlike the fully leptonic h→4ℓ channel.
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Production of Magic States via $Z$ Bosons and Dark Photons
Magic distributions are computed for EW processes (reproducing QED at low energy, new at high energy/Z resonance) and dark-sector scatterings, reaching maximal magic at mass ratios m_f/m_χ → 0 and → 1.83929.
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Controlling Quantum discord and steering in Electron-Positron Annihilation Using Polarized Beams
Polarized lepton beams control quantum discord and steering in hyperon-antihyperon pairs from e+e- annihilation, with discord persisting in separable states via transverse polarization.
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Experimental prospects for quantum decoherence measurements at colliders
Hard final-state radiation measurably destroys the spin entanglement of fermion-antifermion pairs, and the effect should already be visible in LHC ttbar+jet and Belle II tau+tau-gamma data.
- Disentangling new physics with quantum entanglement in $t\bar{t}$ production at future lepton colliders