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Testing Bell inequalities at the LHC with top-quark pairs
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Entanglement between the spins of top-quark pairs produced at a collider can be used to test a (generalized) Bell inequality at energies never explored so far. We show how the measurement of a single observable can provide a test of the violation of the Bell inequality at the 98% CL with the data already collected at the Large Hadron Collider and at the 99.99% CL with the higher luminosity of the next run.
Forward citations
Cited by 27 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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Flavor--Kinetic Entanglement Production from Decay and Scattering at Finite Density
At finite density, the leading flavor-kinetic entanglement entropy equals twice the occupation-weighted branch-changing collision probability, and this quantity is used to diagnose first-order versus continuous therma...
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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 detection of CP violation in the $t\bar{t}$ system: tomography
Polar-angle tomography reconstructs the ttbar production density matrix while b–lepton azimuthal sine modulations linearly probe CP-odd Wtb decay couplings, separating production from decay CP violation.
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Quantum detection of CP violation in the $t\bar{t}$ system: production
CP-odd SMEFT top interactions appear as ΔB and antisymmetric C_A in the tt̄ production density matrix; direct markers beat most QI measures for CP sensitivity at LHC and FCC-ee.
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Soft-Radiation-Induced Decoherence of Heavy-Quark Spin Entanglement at the Electron-Ion Collider
Subleading soft-gluon recoil rotates the heavy-quark spin-correlation plane; tracing over unresolved radiation dephases in-plane coherences while protecting the normal-axis correlation.
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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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Extracting a Toponium Signal at the LHC with Spin and Quantum Information Tools
Spin and quantum-information observables add only marginal statistical power beyond kinematic variables for isolating toponium in near-threshold top-pair events, but improve interpretability.
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Experimental characterization of the hierarchy of quantum correlations in top quark pairs
LHC top-quark data show quantum discord at >5σ, first evidence for steering at >3σ, no Bell correlations, and nonzero magic.
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Excluding Local Hidden Variables in $\Lambda\bar{\Lambda}$ Production: The Incompatibility with Angular-Momentum Conservation and CPT Invariance
Scalar h→ΛarΛ decay is incompatible with any angular-momentum-conserving LHVT, while pseudoscalar a→ΛarΛ can be mimicked by an LHVT only if CPT symmetry is relaxed.
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Entanglement, Yang-Mills, and the Scattering Matrix as an SU(N)-equivariant Kernel
SU(N) symmetry fixes the entangling power of 2→2 scattering: Yang-Mills adjoint scattering has a group-only entanglement maximum at 90° (3/4 for SU(2), ≈0.91 for SU(3)), and maximal-entanglement preservation selects t...
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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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Quantum Tomography in Neutral Meson and Antimeson Systems
The complete flavor density matrix of a neutral meson-antimeson pair can be reconstructed from time-dependent semileptonic decay rates, with B_s^0 and K^0 the most favorable systems.
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Entanglement through high-energy scattering in noncommutative quantum electrodynamics
In noncommutative QED, tree-level photon and head-on fermion scattering with opposite helicities give the same concurrence as gluon scattering, maximal at a 90-degree scattering angle, while a right-angle fermion coll...
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Quantum tomography beyond the leading order
NLO corrections to angular distributions can be subtracted as a background, allowing quantum tomography of H to ZZ to four leptons to be performed with the well-defined leading-order spin interpretation.
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Tests of quantum contextuality in particle physics
Spin states measured in collider data violate non-contextuality inequalities with significance above 5 sigma for several mesons, baryons, and top-quark pairs.
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Bell Inequality Violation of Light Quarks in Back-to-Back Dihadron Pair Production at Lepton Colliders
Using dihadron fragmentation functions as spin analyzers, the paper shows that Bell inequality violation in massless quark pairs can be probed through azimuthal correlations, with projected discovery significance from...
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The trace distance between density matrices, a nifty tool in new-physics searches
Using the trace distance between Standard Model and new-physics density matrices gives the strongest quantum-information bounds on anomalous top and tau couplings, along with first measurements of magic in collider data.
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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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Probing CP-violating top-quark dipole moments with tomographic observables
CP-odd spin-density-matrix observables and their optimal combination can probe top electric and chromo-electric dipole moments with projected reaches up to about 200 TeV at the HL-LHC, while the top-antitop discord as...
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Quantum spin correlations in $Z^\prime$-mediated $t\bar{t}$ production at future lepton colliders
Quantum spin observables of t-bar-t pairs at future lepton colliders can distinguish chiral U(1)_X Z′ charge assignments, and polarized e−e+ beams isolate left- vs right-handed lepton couplings.
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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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Probing new physics in the top sector using quantum information
In top-pair production at the LHC, the quantum-information measures magic, concurrence, trace distance, and fidelity distance each respond most strongly to new physics in different kinematic regions, so no single meas...
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Testing spooky action between free-traveling electron-positron pairs
Simulations show that Bhabha scattering can produce electron-positron pairs with near-maximal entanglement, and a two-target secondary-scattering scheme could in principle measure their spin correlations.
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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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