Abstracts
Abstracts
Invited talks:
Speaker: Afik, Yoav (Chicago/CERN)
Title: When Theory Becomes Reality: Measuring Quantum Information Concepts with heavy-flavor quarks
Abstract: The Standard Model of particle physics is a quantum field theory, based on quantum mechanics and special relativity. Therefore, it allows us to test fundamental properties of quantum mechanics. Top-quark and bottom-quark pairs, which are generated at the LHC, are unique high-energy systems since their spin correlations can be measured. Thus, it is possible to study fundamental aspects of quantum mechanics such as entanglement and Bell nonlocality using such quark pairs, represented as two qubits. The environment provided by the LHC makes these studies especially attractive: the qubits are entangled through exotic interactions and are genuinely relativistic, at energies which are many orders of magnitude above conventional condensed-matter and optical experiments. I will discuss the theoretical background, the first measurements of entanglement between top-quark pairs by the ATLAS and CMS collaborations, and the future prospects of the field.
Quantum_Tops___WQC_Workshop.pdf
Speaker: Blasone, Massimo (Salerno)
Title: Quantum Correlations in Elementary Particle Processes
Abstract: I will review recent work on entanglement and quantum correlations in elementary particle systems, ranging from neutrino oscillations to QED scattering processes. In both cases, the aim of our analysis is the search for yet unexplored features of fundamental interactions which can be unveiled by methods of quantum information. In our study, we make use of complete complementarity relations (CCR), which fully characterize both the local and nonlocal properties of a quantum system, whether pure or mixed.
For neutrinos, CCR applied to oscillations reveals a complex structure of correlations. Among these, the nonlocal advantage of quantum coherence emerges as a significant quantifier of coherence. I will also discuss chiral oscillations and their impact on spin quantum correlations in a lepton–antineutrino pair produced via weak interactions. Finally, I will address Leggett–Garg temporal inequalities in neutrino and meson oscillations.
I will then present recent results concerning the generation and distribution of (helicity) entanglement in Quantum Electrodynamics (QED) scattering processes. Viewing QED scatterings as quantum maps with distinct spectral properties reveals a unique role for maximal entanglement, which is strictly conserved in 2→2 scattering events involving only fermions. Moreover, repeated iterations of these maps inevitably lead to entanglement saturation, regardless of the initial state.
Speaker: Cao, Qinghong (PKU)
Title: Entropy constraint on effective field theory
Abstract: TBA
Speaker: Demina, Regina (Rochester)
Title: Quantum information observables in the system of top and antitop quarks at LHC
Abstract: I will review the methodology and the results of the full spin correlation measurement in the system of top and antitop quarks at LHC. Using these results, we were able to demonstrate the system is entangled at thethreshold of its production and in the high invariant mass regime. Using the full spin correlation coefficients , we evaluated the von Neumann entropy, discord, magic and contextuality of the system. These measurements are performed in bins of the invariant mass and scattering angle. l will discuss the prospectsfor the future QlS measurements in the top quark system.
Speaker: Di Domenico, Antonio (Roma/Frascati)
Title: The "back from the future" quantum effect in entangled neutral kaons at KLOE/KLOE-2Abstract: A novel quantum phenomenon associated to a peculiar time correlation between entangled neutral kaons produced at a 𝜙-factory is discussed: the past state of the first decayed kaon, when it was still entangled > before its decay, is post-tagged by the result and the time of the future observation on the other kaon decay. This surprising "back from the future" effect is fully observable and preliminary results obtained from the analysis of data collected by the KLOE experiment at the DAΦNE collider are presented, showing experimental evidence of this new effect.
Speaker: Gu, JiaYin
Title: Positivity bounds: probing the foundations of quantum field theory
Abstract: TBA
Speaker: Han, Tao (Pittsburgh)
Title: Quantum Tomography at High Energy CollidersAbstract: There has been increasing interest in exploring quantum information from high energy collider experiments. In this talk, I will review the construction of quantum states and perform quantum tomography from collider data, mostly based on the spin states and heavy flavor states. I will summarize the recent activities and results, and comment on the future directions.
Speaker: Hiesmayr, Beatrix (Wien)
Title: Entanglement at low and high energies
Abstract: Entanglement is not a rare phenomenon in nature. This lecture deals with photons with very high energies, gammas, which are produced in pairs or in threes, e.g. in a PET scan of a human (PET...Positron Emission Tomograph), and how their entanglement can be measured and used for medical applications. In the second part of the lecture, different types of entanglement such as multiparticle entanglement and PPT entanglement or bound entanglement are discussed and applied to systems at high energies such as neutrinos.
Speaker: Jones, Eleanor (DESY/CERN)
Title: Challenges in experimental measurements of quantum properties at colliders
Abstract: TBA
Speaker: Jung, Andreas (Purdue)
Title: Quantum Entanglement in top quark events and perspectives into future prospects
Abstract:TBA
Speaker: Korn, Steffen (Gottingen) [Online]
Title: Reconstructing the Invisible: Toward Quantum-Aware Observables in HVV Final States at ATLAS
Abstract: As the pursuit of quantum information signatures in high-energy collisions accelerates, the ability to efficiently reconstruct Higgs boson decays to vector bosons (HVV) becomes increasingly critical. This talk presents an ATLAS-inspired approach, addressing the experimental challenges in reconstructing HVV final states. This serves as a foundation for defining and measuring observables that are sensitive to quantum entanglement and other constructs from quantum information theory. The presentation will highlight techniques for reconstructing di-neutrinos using both traditional kinematic methods and contemporary machine learning approaches. It will also examine the role of c-tagging, a crucial process that identifies the presence of a charm quark, in resolving hadronic decays. Additionally, the talk will discuss event classification strategies based on neural networks. Furthermore, HZZ will be used as a benchmark for fully reconstructible final states, providing a unique perspective on angular correlations and potential entanglement observables. Across all HVV channels, the talk will explore the potential of employing machine learning techniques for signal-background discrimination and event reconstruction, paving the way for exciting future developments. It will also focus on generating non-entangled event samples, which are necessary for measuring quantum-sensitive observables.
Speaker: Lagouri, Theodota (CERN)
Title: Probing Quantum Information through Higgs Boson Decays: Experimental Opportunities at the LHC and Beyond
Abstract: The talk will focus on a forward-looking strategy for exploring quantum information (QI) observables in Higgs boson decays, with an emphasis on methodological ideas and future experimental prospects.
Higgs_QI_WQC_Talk_Theodota-pdf.pdf
Speaker: Li, Haibo (IHEP)
Title: CP violation with the entangled hyperon pair at e+e- collision
Abstract: The BESIII experiment, operating at the Beijing Electron-Positron Collider II (BEPCII), offers unique capabilities for studying hyperon CP asymmetry, by leveraging its precision instrumentation, access to tau-charm energy regimes, low background contamination, and innovative methodologies to overcome traditional experimental limitations. Through the decays of 10 billion and 2.7 billion events, tens of millions of quantum-entangled and polarized hyperon-antihyperon pairs can be produced, establishing BESIII as a hyperon factory for precision CP asymmetry studies. The BESIII experiment aims to measure CP asymmetry in hyperon decays with a sensitivity of 0.3% and precisely determine hyperon EDMs with a precision of up to 10^-19 e·cm. These efforts will search for new physics beyond the Standard Model and play a pivotal role in addressing the cosmic antimatter disappearance mystery.
Speaker: Li, Qiang (PKU)
Title:Testing entanglementbetween high energy lepton pairs.
Abstract:The study of quantum entanglement and testing Bell inequality violation can be another new subject for the high energy physics community. While detectors at high-energy colliders are not specifically designed to probe quantum entanglement, they have demonstrated surprising effectiveness in this task. This opens up exciting opportunities for novel measurements in quantum information science, as well as potential discoveries that could extend beyond the Standard Model.
Speaker: Li, Tianjun (ITP/UCAS)
Title: Quantum Entanglement Theory and Its Generic Searches at the Colliders
Abstract: We propose a new formalism for quantum entanglement, and study its generic searches at the colliders. For a general quantum system with N particles, we show that the quantum space (the total spin polarization parameter space) is complex projective space, and the classical space (the spin polarization parameter space for classical theory) is the cartesian product of the complex projective spaces. Thus, the quantum entanglement space is the difference of these two spaces. For the ff, AA, Af, fff, and ffA systems, we calculate their discriminants \Delta_i. The corresponding classical spaces are the discriminant locus \Delta=0 for ff system, and intersections of the discriminant loci \Delta_i=0 for AA, Af, fff, and ffA systems in the quantum space. In particular, for the two fermion $ff$ system, we show that our discriminant criterion is equivalent to the original Peres-Horodecki criterion and the CHSH criterion. And thus our quantum entanglement space is indeed Bell non-local. At the colliders, we can reconstruct the discriminants from various measurements, and probe the quantum entanglement spaces at exact level. This provides a fundamental approach to testing the quantum entanglement. In addition, for the specific approach, we propose a generic method to calculate the quantum range and classical range for the expectation value of any physics observable, and can probe the quantum entanglement spaces which the previous way cannot test for some cases. Furthermore, we define the quantum non-locality tests as the tests for quantum entanglement space via the space-like separated measurements, which can be done at colliders as well.
Speaker: Liu, Jia (PKU)
Title: Reaching the Ultimate Quantum Precision Limit at Colliders: Conditions and Case Studies
Abstract: We investigate whether collider experiments can reach the quantum limit of precision, defined by the quantum Fisher information (QFI), using only classical observables such as particle momenta. The answer is yes—under specific conditions. We present a general framework that reveals when and how this quantum limit can be asymptotically achieved.
Speaker: Low, Ian [Online]
Title: Quantum entanglement and emergent symmetry
Abstract: TBA
Speaker: Mavromatos, Nikolaos (KCL)
Title: Quantum Gravity, CPT Violation and Entangled Particle States
Abstract: I discuss the potential role of Quantum Gravitational interactions on inducing a form of CPT Violation due to decoherence of quantum particle states in situations where the particles are produced in entangled pairs. There are distinguishing features of such an effect (termed omega-effect) whose phenomenology is discussed in the context of present and future experiments.
Mavromatos_Entanglement_HEP_Gravity_)WQC_China_2025.pdf
Speaker: Mitsou, Vasiliki (Valencia/CERN)
Title: ATLAS results on quantum entanglement
Abstract: Quantum information science is booming, and high-energy physics is getting involved. This study presents the ATLAS experiment's measurement of quantum entanglement in top quark pair production: the highest-energy measurement of entanglement ever made, and the first between fundamental fermions. Concentrating on an area of phase-space close to the top quark pair invariant mass threshold, the presence of quantum entanglement is extracted from angular correlations in leptonic top quark decays. This analysis inaugurates the measurements of quantum information phenomena in top quark systems and other LHC channels and paves the way for further cross-pollination between high-energy physics and quantum information science.
Speaker: Munoz, Juan Ramon (Madrid)
Title: Quantum colliders
Abstract: Quantum Mechanics is the fundamental theory of the microscopic world, developed at the beginning of the 20th century. The study of quantum foundations and the classical-quantum frontier is still nowadays an active field of research, with direct applications in quantum technologies. However, little attention has been devoted to experimental tests of quantum signatures at relativistic energies, even though it is a subject of fundamental interest. We discuss how high-energy colliders can become a unique laboratory for such purposes. We focus on the paradigmatic case of a top-antitop quark pair, a Drosophila of a relativistic two-qubit system, since its quantum state can be fully reconstructed from the angular distribution of the decay products. We discuss how quantum correlations, such as entanglement, can be studied in high-energy colliders using top-quark pairs, including recent measurements by ATLAS and CMS. Finally, we outline future avenues for the development of the exciting field of quantum colliders.
Speaker: Pan, Jianwei (USTC)
Title: TBA
Abstract: TBA
Speaker: Ravina, Baptiste (CERN) [Online]
Title: Quantum uncertainties with top quarks
Abstract: Quantum mechanics predicts that measurements of incompatible observables carry an intrinsic uncertainty, independently of the precision of the measuring apparatus or the knowledge of the system state. l apply techniques to estimate this quantum uncertainty to the measurement of spin correlations in top quark pair production at the LHC, and comment on the relationship of this new estimator of quantum correlations with discord, concurrence, and the Fisher information of the spin density matrices. Recent experimental data from the CiS Collaboration are re-interpreted, and sensitivity to relevant Standard Model Effective Field Theory operators is explored.
Speaker: Shi, Yu (WQC/USTC)
Title: Quantum entanglement in particle physics: historical origins and some recent work
Abstract: We first review early experimental work by C. S. Wu exposing the polarization entanglement of photon pairs created in electron-positron annihilations, and the theoretical work by T. D. Lee and C. N. Yang on flavor entanglement of kaons. Then we go on to review some recent work on flavor entanglement of pseudoscalar mesons, including the use of entangled pairs for testing discrete symmetry violations on one hand, and for high energy quantum information processes and violation of realism on the other. In particular, we explore the possibility of high energy quantum teleportation and testing violation of a certain type of nonlocal realism. We have endeavored to close the measurement loophole in decaying particles.
Speaker: Wang, Liantao (Chicago)
Title: Quantum description ofwave-like dark matter
Abstract: TBA
Speaker: Wang, Qun (USTC)
Title: Bell nonlocality and entanglement in hyperon-antihyperon system
Abstract: The Bell nonlocality and entanglement are two kinds of quantum correlations in quantum systems. Due to the recent upgrade in Beijing Spectrometer III (BESIII) experiment, it is possible to explore the nonlocality and entanglement in hyperon-antihyperon systems produced in electron-positron annihilation with high precision data. We provide a systematic method for studying quantum correlations in spin-1/2 hyperon-antihyperon systems through the measures for nonlocality and entanglement. We find that with nonvanishing polarizations of the hyperon and its antihyperon, the kinematic region of nonlocality in the hyperon-antihyperon system is more restricted than the τ+τ− system in which polarizations of τ leptons are vanishing. We also present an experimental proposal to probe the nonlocality and entanglement in hyperon-antihyperon systems at BSEIII.
Speaker: Wilczek, Frank (WQC/MIT) [Online]
Title: TBA
Abstract: TBA
Speaker: Wu, Yueliang (UCAS/ITP)
Title: The Entangled Qubit-Spinor Field as Nature’s Foundation: A Pathway to Unifying Quantum Mechanics and General Relativity
Abstract: TBA
Speaker: Xing, Zhizhong (IHEP)
Title: Quantum-entangled B mesons and CP violation: a brief overview
Abstract: This talk is intended to provide a historical overview of quantum-entangled production of neutral-B mesons and their mixing effects, and highlight the discovery of CP violation in neutral-Bdecays as a strong test of the Kobayashi-Maskawa mechanism in the standard electroweak model of particle physics.
Contributed talks:
Speaker: Hu, TaoRan (UCAS)
Title: Entanglement Suppression, Quantum Statistics and Symmetries in Spin-3/2 Baryon Scatterings
Abstract: We explore the interplay between entanglement suppression, quantum statistics and enhanced symmetries in the non-relativistic S-wave scattering involving the lowest-lying spin3/2 baryons, which can be considered as four-dimensional qudits. These baryons form a ten-dimensional representation (decuplet) under the SU (3) light-flavor symmetry and, in this limit, are considered indistinguishable under strong interactions. Treating the S-matrix in the spin-3/2 baryon-baryon scattering as a quantum logic gate in the spin space, we study the consequence of entanglement suppression and compute the entanglement power of the S-matrix. When the entanglement power vanishes, the S-matrix is either an Identity or a SWAP gate and spin-flavor symmetries and/or non-relativistic conformal invariance emerge, as previously observed in spin-1/2 baryons. In the case of scattering identical particles, the entanglement power never vanishes due to constraints from spin statistics, which we interpret as projection-valued measurements onto symmetric or antisymmetric Hilbert space and define the entanglement power accordingly. When the entanglement power is non-vanishing but sits at a global or local minimum, enhanced symmetries still emerge and the S-matrix can be interpreted as an Identity or a SWAP gate acting on the restricted Hilbert space allowed by quantum statistics. In general, when scattering identical spin-s particles, we identify an enhanced SU (2s+1)-spin symmetry for the Identity gate.
Speaker: Zhou, BaiHong (SJTU)
Title: Entanglement and Bell Nonlocality in τ+τ− at the LHC using Machine Learning for Neutrino Reconstruction
Abstract: Quantum entanglement is a hallmark feature of quantum mechanics, manifesting as correlations between subsystems that cannot be fully described without one another, regardless of spatial separation. While entanglement has been observed in processes such as $pp\to t \bar{t}$ and thoroughly analyzed in Higgs decay channels ($H\to VV$) at the Large Hadron Collider (LHC), it remains comparatively underexplored in the $pp\to \tau\tau$ system. In this study, we adapt OmniLearn, a foundational model for solving all jet physics tasks, to reconstruct the neutrino information in the final state of $pp\to \tau\tau$ system, which is an essential step toward probing quantum entanglement in this channel. Good neutrino reconstruction has reached now, which is the key to the following steps in the reconstruction level study.