Spin entanglement signatures of proton from a light-front Hamiltonian

• URL: http://arxiv.org/abs/2603.16681v1
• Date: Tue, 17 Mar 2026 15:42:42 GMT
• Title: Spin entanglement signatures of proton from a light-front Hamiltonian
• Abstract summary: We compare the proton spin entanglement obtained from Basis Light-Front Quantization with that from a quark-diquark model.<n>We find that the quark-diquark model yields a substantially more entangled spin state than the BLFQ wave function.
• Score: 9.245070700513777
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum entanglement provides a quantitative probe of the internal structure of hadrons and offers a sensitive means to study the quantum correlation in the hadron wave functions. For baryons, the spin state of the three valence quarks forms a tripartite qubit system, whose entanglement structure can be characterized by the four classes of three-qubit states. In this work, we compare the proton spin entanglement obtained from Basis Light-Front Quantization (BLFQ) with that from a quark-diquark model. By analyzing both bipartite and tripartite entanglement, we find that the quark-diquark model yields a substantially more entangled spin state than the BLFQ wave function in the valence Fock sector. This difference mainly originates from the larger W-type and Bell-type entanglement in the quark-diquark model. Within BLFQ, larger stronger coupling constant and smaller quark mass drive the spin correlation among the valence quarks towards an effective quark-diquark configuration with an active $d$ quark and a correlated $uu$ pair.

Related papers

• Trion Excitations in Twisted Bilayer Graphene: A Quantum Monte Carlo Study [2.640943867719066]
  We reveal "Dirac trion" excitations in the finite-temperature normal state of twisted bilayer graphene.<n>We show that this normal state hosts gapless excitations consisting of three-particle bound states, two electrons and one hole.<n>Our unbiased quantum many-body computation sheds light on the Dirac trions in a projected correlated flat-band setting.
  arXiv  Detail & Related papers  (2026-07-30T06:35:05Z)
• Tailoring pure valley-Zeeman spin-orbit coupling in WSe$_2$-encapsulated monolayer graphene [42.39722022913058]
  Engineering proximity effects in twisted van der Waals heterostructures offers a powerful platform for designing electronic properties.<n>We report pure valley-Zeeman spin-orbit coupling in monolayer graphene, achieved by encapsulation between two parallel twisted WSe$$ monolayers.<n>We also demonstrate the ability to completely quench the proximity spin-orbit coupling by tuning the encapsulated geometry.
  arXiv  Detail & Related papers  (2026-06-02T07:43:48Z)
• Two Protons, Two Positrons, and Four Electrons: Covalent Bond with van der Waals Characteristics [46.03321798937855]
  We focus on a paradigmatic example of positronium hydride composed of two protons, two positrons, and four electrons.<n>Our findings suggest that the ability to form delocalized proto-bonds is a more general property of quantum systems.
  arXiv  Detail & Related papers  (2026-05-14T17:19:09Z)
• Experimental characterization of the hierarchy of quantum correlations in top quark pairs [0.0]
  We evaluate a set of quantum observables, including discord, steering, Bell correlation, and magic.<n>These observables allow for a quantitative characterization of the quantum correlations present in a top quark--antiquark system.
  arXiv  Detail & Related papers  (2026-02-16T19:00:04Z)
• Determination of quark-gluon-quark interference within the proton [0.0]
  We investigate the twist-three parton distribution functions, which encode quantum interference between quark-gluon-quark states.<n>The extracted distributions reveal a clear flavor-dependent patterns and distinct from zero at a statistically significant level.<n>These findings provide the first quantitative evidence for quark-gluon-quark correlations within the proton, revealing its genuinely quantum nature.
  arXiv  Detail & Related papers  (2025-11-06T11:38:17Z)
• Evolution of multi-qubit correlations driven by mutual interactions [49.1574468325115]
  We analyze the evolution of the correlation tensor elements of quantum systems composed of $frac12$-spins.<n>We show how a strong external field can play a stabilizing factor with respect to certain correlation characteristics.
  arXiv  Detail & Related papers  (2025-07-01T11:45:08Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits.<n>Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Quark and gluon entanglement in the proton based on a light-front Hamiltonian [11.340474522152656]
  We compute the spin and longitudinal momentum entanglement of each parton inside the proton.<n>Our calculations indicate that the dynamical gluon significantly enhances entanglement among the proton's partons.<n>These findings suggest the potential for experimental verification of the entanglement between partons.
  arXiv  Detail & Related papers  (2024-12-16T15:18:40Z)
• Quarkonium Polarization in Medium from Open Quantum Systems and Chromomagnetic Correlators [0.0]
  We study the spin-dependent in-medium dynamics of quarkonia by using the potential nonrelativistic QCD (pNRQCD) and the open quantum system framework. We derive the Boltzmann transport equation for quarkonia with polarization dependence in the quantum optical limit. We also derive a Lindblad equation describing the in-medium transitions between spin-singlet and spin-triplet heavy quark-antiquark pairs.
  arXiv  Detail & Related papers  (2024-05-30T17:33:38Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Dilute neutron star matter from neural-network quantum states [58.720142291102135]
  Low-density neutron matter is characterized by the formation of Cooper pairs and the onset of superfluidity. We model this density regime by capitalizing on the expressivity of the hidden-nucleon neural-network quantum states combined with variational Monte Carlo and reconfiguration techniques.
  arXiv  Detail & Related papers  (2022-12-08T17:55:25Z)
• Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite [50.591267188664666]
  We reveal a rich ground state phase diagram even at the classical level. The presented model opens a new direction in the study of kagome antiferromagnets.
  arXiv  Detail & Related papers  (2021-07-28T18:00:03Z)
• Measurement of Bell-type inequalities and quantum entanglement from $\Lambda$-hyperon spin correlations at high energy colliders [0.0]
  Spin correlations of $Lambda$-hyperons embedded in the QCD strings formed in high energy collider experiments provide unique insight into their locality and entanglement features. We show that while the Clauser-Horne-Shimony-Holt inequality is less stringent for such states, they provide a benchmark for quantum-to-classical transitions induced by varying i) the associated hadron, ii) the spin of nucleons,iii) the separation in rapidity between pairs, and iv) the kinematic accessed.
  arXiv  Detail & Related papers  (2021-07-27T18:00:02Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.