Related papers: About testing Bell locality at colliders

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Particle Collisions & Quantum Entanglement in High-Energy Collisions [0.0]
Investigation of fundamental quantum phenomena, such as entanglement and Bell inequality violations, has recently extended to high-energy particle collisions.<n> Particle colliders provide a novel setting for probing quantum information theory, operating at energies over ten orders of magnitude higher than previous experiments.<n>This book chapter reviews key theoretical and experimental advancements in this emerging field, highlighting its challenges, objectives, and potential impact on both quantum information theory and high-energy physics.
arXiv Detail & Related papers (2025-09-09T10:52:36Z)
Optimal Local Simulations of a Quantum Singlet [0.94371657253557]
Bell's seminal work showed that no local hidden variable (LHV) model can fully reproduce the quantum correlations of a two-qubit singlet state. We numerically determine the LHV models maximizing anticorrelations for random axes separated by any fixed angle. These findings enrich the understanding of Bell non-locality as a physical resource in quantum information theory and quantum cryptography.
arXiv Detail & Related papers (2025-04-29T17:24:32Z)
Time evolution of randomness in Bell's experiment indicates 'Realism' is false [41.94295877935867]
We measure time evolution of Minimum Entropy and (estimated) Kolmogorov's Complexity of binary time series during short pulses. We compare evolution between the cases with stations placed close and separated 24m in straight line. This provides a clue about which one of the hypotheses necessary for the derivation and observation of Bell's inequalities is false.
arXiv Detail & Related papers (2025-04-04T20:39:15Z)
Quantum Information meets High-Energy Physics: Input to the update of the European Strategy for Particle Physics [46.35100548313364]
Some of the most astonishing and prominent properties of Quantum Mechanics, such as entanglement and Bell nonlocality, have only been studied extensively in dedicated low-energy laboratory setups.<n>The feasibility of these studies in the high-energy regime explored by particle colliders was only recently shown, and has gathered the attention of the scientific community.
arXiv Detail & Related papers (2025-03-31T18:00:01Z)
Consequences of the single-pair measurement of the Bell parameter [0.0]
Bell inequalities represent a milestone for contemporary Physics. Strong debate is still ongoing on the actual meaning of Bell inequality tests. Recent work achieves for the first time an experimental estimation of the entire Bell-CHSH parameter from a single entangled pair.
arXiv Detail & Related papers (2024-09-04T08:11:40Z)
Proposal of an optical Bell's experiment to test the boundary between determinism and indeterminism in Quantum Mechanics [41.94295877935867]
It was recently noted the existence of an apparently discontinuous boundary between determinism and indeterminism in Quantum Mechanics. We propose to explore this boundary by recording the distribution of outcomes of a given parity interrupted by outcomes of the other parity. The features of these distributions for small rotations of the angle settings near critical points may indicate whether the underlying process is in-deterministic or not.
arXiv Detail & Related papers (2024-08-20T14:48:08Z)
Testing Bell inequalities and probing quantum entanglement at a muon collider [4.725524563065446]
We present here the prospects of detecting quantum entanglement and the violation of Bell inequalities in H to ZZ to 4l events at a potential future muon collider. We show that the spin density matrix of the Z boson pairs can be reconstructed using the kinematics of the charged leptons from the Z boson decays.
arXiv Detail & Related papers (2024-08-10T04:22:53Z)
Probing many-body Bell correlation depth with superconducting qubits [17.3215930037341]
We report an experimental certification of genuine multipartite Bell correlations, which signal nonlocality in quantum many-body systems. In particular, we employ energy as a Bell correlation witness and variationally decrease the energy of a many-body system across a hierarchy of thresholds. Our results establish a viable approach for preparing and certifying multipartite Bell correlations, which provide a finer benchmark beyond entanglement for quantum devices.
arXiv Detail & Related papers (2024-06-25T18:00:00Z)
Effects of Topological Boundary Conditions on Bell Nonlocality [0.9374652839580183]
Bell nonlocality is the resource that enables device-independent quantum information processing tasks. Our work can act as a guide to certify Bell nonlocality in many-qubit devices.
arXiv Detail & Related papers (2024-05-23T13:58:50Z)
Device-independent Verification of Quantum Coherence without Quantum Control [5.423299165382733]
Coherence plays a crucial role in manipulating and controlling quantum systems. Most coherence witnesses rely on the assumption of being able to control quantum states. We propose a Greenberger-Horne-Zeilinger-type paradox to verify the particle and wave behaviors of a coherent carrier.
arXiv Detail & Related papers (2024-04-15T03:20:12Z)
Verification of Bell Nonlocality by Violating Quantum Monogamy Relations [2.062195473318468]
Existing quantum monogamy relations rule out the possibility of simultaneous violations of any Bell inequalities. We demonstrate that violating these monogamy relations can dynamically witness simultaneous Bell nonlocalities of partial systems. We conduct a tripartite experiment to verify quantum nonlocalities by violating a tripartite monogamy relation using a maximally entangled two-photon state.
arXiv Detail & Related papers (2024-03-14T08:26:32Z)
Single-measurement Bell analysis [0.0]
We find that every outcome violates Bell bounds for local hidden variables models.<n>This agrees with the idea that to reveal nonclassical effects a necessary condition is that the measuring scheme itself must be nonclassical.
arXiv Detail & Related papers (2023-10-10T09:48:30Z)
Overlapping qubits from non-isometric maps and de Sitter tensor networks [41.94295877935867]
We show that processes in local effective theories can be spoofed with a quantum system with fewer degrees of freedom. We highlight how approximate overlapping qubits are conceptually connected to Hilbert space dimension verification, degree-of-freedom counting in black holes and holography.
arXiv Detail & Related papers (2023-04-05T18:08:30Z)
Bell inequalities with overlapping measurements [52.81011822909395]
We study Bell inequalities where measurements of different parties can have overlap. This allows to accommodate problems in quantum information. The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry.
arXiv Detail & Related papers (2023-03-03T18:11:05Z)
Simple Tests of Quantumness Also Certify Qubits [69.96668065491183]
A test of quantumness is a protocol that allows a classical verifier to certify (only) that a prover is not classical. We show that tests of quantumness that follow a certain template, which captures recent proposals such as (Kalai et al., 2022) can in fact do much more. Namely, the same protocols can be used for certifying a qubit, a building-block that stands at the heart of applications such as certifiable randomness and classical delegation of quantum computation.
arXiv Detail & Related papers (2023-03-02T14:18:17Z)
Schr\"odinger cat states of a 16-microgram mechanical oscillator [54.35850218188371]
The superposition principle is one of the most fundamental principles of quantum mechanics. Here we demonstrate the preparation of a mechanical resonator with an effective mass of 16.2 micrograms in Schr"odinger cat states of motion. We show control over the size and phase of the superposition and investigate the decoherence dynamics of these states.
arXiv Detail & Related papers (2022-11-01T13:29:44Z)
Collisional-model quantum trajectories for entangled qubit environments [0.0]
We study the dynamics of quantum systems interacting with a stream of entangled qubits. We present a framework describing the conditional dynamical maps for the system, called quantum trajectories, when the qubits are measured.
arXiv Detail & Related papers (2022-02-27T02:25:26Z)
Interactive Protocols for Classically-Verifiable Quantum Advantage [46.093185827838035]
"Interactions" between a prover and a verifier can bridge the gap between verifiability and implementation. We demonstrate the first implementation of an interactive quantum advantage protocol, using an ion trap quantum computer.
arXiv Detail & Related papers (2021-12-09T19:00:00Z)
Many-body Bell inequalities for bosonic qubits [0.0]
This work is to analyze a set of Bell inequalities suitable for a possibly broad family of many-body systems. We develop a method that allows for a step-by-step study of the many-body Bell correlations.
arXiv Detail & Related papers (2021-09-30T14:20:12Z)
About the description of physical reality of Bell's experiment [91.3755431537592]
A hidden variables model complying with the simplest form of Local Realism was recently introduced. It reproduces Quantum Mechanics' predictions for an even ideally perfect Bell's experiment. A new type of quantum computer does not exist yet, not even in theory.
arXiv Detail & Related papers (2021-09-06T15:55:13Z)
Bell nonlocality in networks [62.997667081978825]
Bell's theorem proves that quantum theory is inconsistent with local physical models. In the last decade, the investigation of nonlocality has moved beyond Bell's theorem to consider more sophisticated experiments. This review discusses the main concepts, methods, results and future challenges in the emerging topic of Bell nonlocality in networks.
arXiv Detail & Related papers (2021-04-21T18:00:48Z)
Probing the limits of quantum theory with quantum information at subnuclear scales [0.13844779265721088]
We propose a new theoretical framework of Q-data tests. It recognises the established validity of quantum theory, but allows for more general -- 'post-quantum' -- scenarios in certain physical regimes.
arXiv Detail & Related papers (2021-03-22T16:47:39Z)
Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor. We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
arXiv Detail & Related papers (2021-01-21T22:18:49Z)
Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator [41.74498230885008]
We demonstrate a programmable quantum simulator based on deterministically prepared two-dimensional arrays of neutral atoms. We benchmark the system by creating and characterizing high-fidelity antiferromagnetically ordered states. We then create and study several new quantum phases that arise from the interplay between interactions and coherent laser excitation.
arXiv Detail & Related papers (2020-12-22T19:00:04Z)
Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
arXiv Detail & Related papers (2020-11-24T07:06:36Z)
Direct observation of deterministic macroscopic entanglement [0.0]
Quantum entanglement of mechanical systems emerges when distinct objects move with such a high degree of correlation that they can no longer be described separately. Here, using pulsed electromechanics, we deterministically entangle two mechanical drumheads with masses of 70 pg.
arXiv Detail & Related papers (2020-04-12T00:55:33Z)
Entanglement and quantum tomography with top quarks at the LHC [0.0]
Entanglement is a central subject in quantum mechanics. We propose the detection of entanglement between the spins of top-antitop-quark pairs at the LHC. We show that entanglement can be observed by direct measurement of the angular separation between the leptons arising from the decay of the top-antitop pair.
arXiv Detail & Related papers (2020-03-04T19:00:03Z)
Quantum Mechanical description of Bell's experiment assumes Locality [91.3755431537592]
Bell's experiment description assumes the (Quantum Mechanics-language equivalent of the classical) condition of Locality. This result is complementary to a recently published one demonstrating that non-Locality is necessary to describe said experiment. It is concluded that, within the framework of Quantum Mechanics, there is absolutely no reason to believe in the existence of non-Local effects.
arXiv Detail & Related papers (2020-02-27T15:04:08Z)

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