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On bipartite and tripartite entanglement at present and future particle colliders
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abstract
Entanglement, rooted in the non-deterministic, non-local nature of quantum mechanics, serves as a fundamental correlation. High-energy particle colliders offer a unique platform for exploring entanglement in the relativistic regime. The recent observation of entanglement in $t\bar{t}$ production by ATLAS has sparked significant interest in investigating entanglement phenomena at colliders. While bipartite entanglement receives extensive attention, tripartite entanglement remains relatively uncharted. We investigate tripartite entanglement in $t\bar{t}Z$ production at the Large Hadron Collider (LHC) within the Standard Model and with a dimension-$8$ effective operator. Additionally, we explore bipartite entanglement in $t\bar{t}$, $tW^-$, and di-boson production processes, namely $W^+W^-$, $ZZ$, and $W^+Z$, at the LHC and future $e^+e^-$ collider. We numerically compute various measures of entanglement through Monte Carlo events based on the spin density matrix, with its elements (polarization and spin correlation) obtained by analyzing the angular distribution of the final decayed leptons.
Forward citations
Cited by 10 Pith papers
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Qubit-qubit-qutrit quantum correlations in $H \to f \bar f V$
In h→τ^-τ^+ Z decays, the spin state is genuinely qubit-qubit-qutrit entangled almost everywhere, violates Bell inequalities throughout, and carries up to 1.95 bits of non-local magic.
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High Energy Photon Polarimetry at Lepton Colliders: Quantum Information from Converted Photons
Converted photons in Belle II enable high-significance measurements of Bell nonlocality, discord, concurrence, magic and steerability for macroscopically separated GeV diphotons, provided opening-angle resolution reac...
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Hadron Structure from the Hierarchy of Quantum Correlations in Deep-Inelastic Scattering
Quantum-information measures of the DIS final electron-quark state are shown to be sensitive to transversity PDFs and can discriminate between different tensor-charge extractions.
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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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Bypassing Spin-Analyzing Power Dependence for Quantum Entanglement at Colliders: A Case Study of $\Lambda\bar{\Lambda}$
An entanglement witness for J/ψ→ΛΛ̄ built from angular-correlation ratios can certify entanglement without the parity-violating decay parameters, while angle-only ratio tests are shown to fail.
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Spin versus Magic: Lessons from Gluon and Graviton Scattering
For 2 to 2 scattering of massless spin-1/2 to spin-2 particles, the averaged generated magic decreases monotonically with spin, with maxima well below the two-qubit upper bound.
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Measuring Quantum Discord at the LHC
The authors derive closed-form formulas for quantum discord in the ttbar system and predict it can be measured at the LHC with sub-percent precision using the kinematic method.
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Quantum Entanglement Theory and Its Generic Searches in High Energy Physics
The authors define quantum entanglement as the complement of a product-state subspace in complex projective space and propose azimuthal and triple-product collider observables as entanglement witnesses for ttbar, tau+...
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Colliders are not Testing Locality via Bell's Inequality nor Providing an Unconditional Proof of Entanglement
Collider measurements of final-state momenta alone cannot certify Bell nonlocality or entanglement, because the measured angular distribution is itself a local hidden variable model.
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Looking into the quantum entanglement in $H\to ZZ^\star$ at LHC within SMEFT framework
Using symmetrized angular asymmetries from simulated H->ZZ*->4l events, the authors reconstruct the ZZ* density matrix and report a positive concurrence lower bound for all scanned SMEFT couplings.
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