Quantum discord and steering in top quarks at the LHC

• URL: http://arxiv.org/abs/2209.03969v2
• Date: Mon, 5 Jun 2023 18:00:01 GMT
• Title: Quantum discord and steering in top quarks at the LHC
• Authors: Yoav Afik and Juan Ram\'on Mu\~noz de Nova
• Abstract summary: We provide the full picture of quantum correlations in top quarks by studying also quantum discord and steering. quantum discord in a separable quantum state is expected to be detected with high-statistical significance. In contrast to entanglement, the asymmetric nature of quantum discord and steering can provide witnesses of $CP$-violating physics beyond the Standard Model.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Top quarks have been recently shown to be a promising system to study quantum information at the highest-energy scale available. The current lines of research mostly discuss topics such as entanglement, Bell nonlocality or quantum tomography. Here, we provide the full picture of quantum correlations in top quarks by studying also quantum discord and steering. We find that both phenomena are present at the LHC. In particular, quantum discord in a separable quantum state is expected to be detected with high-statistical significance. Interestingly, due to the singular nature of the measurement process, quantum discord can be measured following its original definition, and the steering ellipsoid can be experimentally reconstructed, both highly-demanding measurements in conventional setups. In contrast to entanglement, the asymmetric nature of quantum discord and steering can provide witnesses of $CP$-violating physics beyond the Standard Model.

Related papers

• Effect of the readout efficiency of quantum measurement on the system entanglement [44.99833362998488]
  We quantify the entanglement for a particle on a 1d quantum random walk under inefficient monitoring. We find that the system's maximal mean entanglement at the measurement-induced quantum-to-classical crossover is in different ways by the measurement strength and inefficiency.
  arXiv  Detail & Related papers  (2024-02-29T18:10:05Z)
• Universal shot-noise limit for quantum metrology with local Hamiltonians [2.624076371876711]
  We derive a universal and fundamental bound for the growth of the quantum Fisher information. We prove that the precision cannot surpass the shot noise limit at all times in locally interacting quantum systems.
  arXiv  Detail & Related papers  (2023-08-07T16:13:01Z)
• Quantum data learning for quantum simulations in high-energy physics [55.41644538483948]
  We explore the applicability of quantum-data learning to practical problems in high-energy physics. We make use of ansatz based on quantum convolutional neural networks and numerically show that it is capable of recognizing quantum phases of ground states. The observation of non-trivial learning properties demonstrated in these benchmarks will motivate further exploration of the quantum-data learning architecture in high-energy physics.
  arXiv  Detail & Related papers  (2023-06-29T18:00:01Z)
• A vertical gate-defined double quantum dot in a strained germanium double quantum well [48.7576911714538]
  Gate-defined quantum dots in silicon-germanium heterostructures have become a compelling platform for quantum computation and simulation. We demonstrate the operation of a gate-defined vertical double quantum dot in a strained germanium double quantum well. We discuss challenges and opportunities and outline potential applications in quantum computing and quantum simulation.
  arXiv  Detail & Related papers  (2023-05-23T13:42:36Z)
• 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)
• Quantum jump metrology in a two-cavity network [0.0]
  In interferometry, quantum physics is used to enhance measurement precision. An alternative approach is quantum metrology jump [L. A. Clark et al., Phys A 99, 022102] which deduces information by continuously monitoring an open quantum system. It is shown that the proposed approach can exceed the standard quantum limit without the need for complex quantum states being scalable.
  arXiv  Detail & Related papers  (2022-01-12T10:53:24Z)
• 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)
• Preparing random states and benchmarking with many-body quantum chaos [48.044162981804526]
  We show how to predict and experimentally observe the emergence of random state ensembles naturally under time-independent Hamiltonian dynamics. The observed random ensembles emerge from projective measurements and are intimately linked to universal correlations built up between subsystems of a larger quantum system. Our work has implications for understanding randomness in quantum dynamics, and enables applications of this concept in a wider context.
  arXiv  Detail & Related papers  (2021-03-05T08:32:43Z)
• Quantum Correlations beyond Entanglement and Discord [0.0]
  We experimentally realize a form of quantum correlation that exists even in the absence of entanglement and discord. We implement a robust kind of nonclassical photon-photon correlated state with useful applications in quantum information processing.
  arXiv  Detail & Related papers  (2020-10-07T15:52:20Z)
• 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)
• Probing the Universality of Topological Defect Formation in a Quantum Annealer: Kibble-Zurek Mechanism and Beyond [46.39654665163597]
  We report on experimental tests of topological defect formation via the one-dimensional transverse-field Ising model. We find that the quantum simulator results can indeed be explained by the KZM for open-system quantum dynamics with phase-flip errors. This implies that the theoretical predictions of the generalized KZM theory, which assumes isolation from the environment, applies beyond its original scope to an open system.
  arXiv  Detail & Related papers  (2020-01-31T02:55:35Z)

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.