Particle colliders provide rich quantum systems for quantum information studies. Reconstructing the density matrix, known as quantum tomography, is the first step to studying quantum information at colliders. In this talk, I will revisit the recent developments of quantum tomography in different systems, including the spin states of massive or massless fermion pairs, and the flavor states of...
I start with some histories regarding quantum entanglement in particle physics, and go on to discuss the usefulness of entangled states for particle physics and possibilities of quantum information processing in realms of particle physics.
https://arxiv.org/abs/2402.16574
https://arxiv.org/abs/2406.16298
Recently it has been noticed that many familiar quantum field theories (QFTs) may minimize or maximize the amount of entanglement in a scattering process. Studying the quantum information (QI) properties of final states for on-shell scattering will help establish whether fundamental physics can be formulated in terms of QI principles. We first present a universal relation between final state...
The quantum rigidity of Bell nonlocality in device-independent self-testing scenarios for qutrit systems is established using the sum-over-squares method. It is demonstrated that when the quantum upper bound of the generalized Bell inequality is achieved, the underlying entangled state is required to be maximally entangled, and the measurement observables are uniquely specified.
The emergence of spin correlations through quantum entanglement in unpolarized high-energy collisions offers a unique opportunity to investigate spin-dependent fragmentation functions, even with unpolarized experiments. In a series of studies [1-5], we investigated the longitudinal and transverse spin correlations of back-to-back dihadrons produced in unpolarized $e^+e^-$, $pp$ and $ep$...
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 $pp \rightarrow t \bar{t}$ and thoroughly analyzed in Higgs decay channels ($H \rightarrow VV$) at the Large Hadron Collider (LHC), it...
Quantum entanglement is a cornerstone of quantum mechanics. While entanglement between confined electron pairs is well-studied, free-traveling electron pairs remain largely unexplored due to significant challenges in spin measurement. We hereby propose a novel theory-assisted quantum entanglement test for free-traveling electron-positron pairs through polarization correlation measurements. The...
The time evolution of the neutral B mesons determines key parameters in flavor physics. While their behavior is generally studied under the assumption of perfect quantum coherence, interactions with the surrounding environment can introduce decoherence. The influence of such environmental effects on neutral meson systems can be effectively described using the open quantum system framework....
