Quantum information and CP measurement in $H \to \tau^+ \tau^-$ at future lepton colliders

• URL: http://arxiv.org/abs/2211.10513v2
• Date: Fri, 12 May 2023 09:39:01 GMT
• Title: Quantum information and CP measurement in $H \to \tau^+ \tau^-$ at future lepton colliders
• Authors: Mohammad Mahdi Altakach, Priyanka Lamba, Fabio Maltoni, Kentarou Mawatari and Kazuki Sakurai
• Abstract summary: We investigate the feasibility of measuring quantum properties of tau lepton pairs in the $H to tau+ tau-$ decay at future lepton colliders. We find that detecting quantum correlation crucially relies on precise reconstruction of the tau lepton rest frame. A log-likelihood method is developed that incorporates the information of impact parameters of tau lepton decays.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce a methodology and investigate the feasibility of measuring quantum properties of tau lepton pairs in the $H \to \tau^+ \tau^-$ decay at future lepton colliders. In particular, observation of entanglement, steerability and violation of Bell inequalities are examined for the ILC and FCC-ee. We find that detecting quantum correlation crucially relies on precise reconstruction of the tau lepton rest frame and a simple kinematics reconstruction does not suffice due to the finite energy resolution of the colliding beams and detectors. To correct for energy mismeasurements, a log-likelihood method is developed that incorporates the information of impact parameters of tau lepton decays. We demonstrate that an accurate measurement of quantum properties is possible with this method. As a by-product, we show that a novel model-independent test of CP violation can be performed and the CP-phase of $H \tau \tau$ interaction can be constrained with an accuracy comparable to dedicated analyses, i.e., up to $7.9^{\circ}$ and $5.4^{\circ}$ at ILC and FCC-ee, respectively.

Related papers

• Testing Bell inequalities and probing quantum entanglement at CEPC [5.473273466387532]
  We study quantum entanglement and test violation of Bell-type inequality at the Circular Electron Positron Collider (CEPC) Our study is based on a fast simulation of the $Z$ boson pair production from Higgs boson decay at 250$ GeV. The presence of the quantum entanglement is probed with more than 2$sigma$ confidence level.
  arXiv  Detail & Related papers  (2024-10-22T13:48:06Z)
• Vision Calorimeter for Anti-neutron Reconstruction: A Baseline [32.87485708592552]
  Vision Calorimeter (ViC) is a baseline method for anti-neutron reconstruction using deep learning detectors. ViC substantially outperforms the conventional reconstruction approach, reducing the prediction error of incident position by 42.81%. This study for the first time realizes the measurement of incident $barn$ momentum.
  arXiv  Detail & Related papers  (2024-08-20T07:14:28Z)
• Quantum Algorithms for Simulating Nuclear Effective Field Theories [40.83664249192338]
  We use state-of-the-art Hamiltonian-simulation methods to estimate the qubit and gate costs to simulate low-energy effective field theories (EFTs) of nuclear physics. We demonstrate how symmetries of the low-energy nuclear Hamiltonians can be utilized to obtain tighter error bounds on the simulation algorithm.
  arXiv  Detail & Related papers  (2023-12-08T20:09:28Z)
• 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)
• A hybrid quantum algorithm to detect conical intersections [39.58317527488534]
  We show that for real molecular Hamiltonians, the Berry phase can be obtained by tracing a local optimum of a variational ansatz along the chosen path. We demonstrate numerically the application of our algorithm on small toy models of the formaldimine molecule.
  arXiv  Detail & Related papers  (2023-04-12T18:00:01Z)
• Universal KPZ scaling in noisy hybrid quantum circuits [2.103498641058344]
  Measurement-induced phase transitions (MIPT) have attracted increasing attention due to the rich phenomenology of entanglement structures. In this Letter, we investigate the effect of quantum noise modeled by reset quantum channel acting on each site with probability $q$ on MIPT.
  arXiv  Detail & Related papers  (2022-12-07T19:01:04Z)
• Quantum probes for the characterization of nonlinear media [50.591267188664666]
  We investigate how squeezed probes may improve individual and joint estimation of the nonlinear coupling $tildelambda$ and of the nonlinearity order $zeta$. We conclude that quantum probes represent a resource to enhance precision in the characterization of nonlinear media, and foresee potential applications with current technology.
  arXiv  Detail & Related papers  (2021-09-16T15:40:36Z)
• Enhanced nonlinear quantum metrology with weakly coupled solitons and particle losses [58.720142291102135]
  We offer an interferometric procedure for phase parameters estimation at the Heisenberg (up to 1/N) and super-Heisenberg scaling levels. The heart of our setup is the novel soliton Josephson Junction (SJJ) system providing the formation of the quantum probe. We illustrate that such states are close to the optimal ones even with moderate losses.
  arXiv  Detail & Related papers  (2021-08-07T09:29:23Z)
• Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source [0.0]
  We have experimentally created a robust, ultrabright and phase-stable polarization-entangled state close to maximally entangled Bell-state. We have obtained very reliable and very strong Bell violation as $ S=2.78 pm 0.01 $ with high brightness. The Sagnac configuration provides bidirectional crystal pumping yields to high-rate entanglement source.
  arXiv  Detail & Related papers  (2020-12-04T17:12:17Z)
• Measurement of entropy and quantum coherence properties of two type-I entangled photonic qubits [0.0]
  We generate a polarization-entangled state near to the maximally-entangled Bell-state with high-visibility (high-brightness) $ 98.50 pm 1.33 % $. We calculate the CHSH version of the Bell inequality, as a nonlocal realism test, and find a strong violation from the classical physics. This high-brightness and low-rate entangled photons source can be used for short-range quantum measurements in the Lab.
  arXiv  Detail & Related papers  (2020-12-04T15:34:02Z)
• Weakly invasive metrology: quantum advantage and physical implementations [0.0]
  We show that arbitrarily intense coherent states can obtain information at a rate that scales at most linearly with $N_rm abs$ and $T$. We discuss an implementation in cavity QED, where Fock states are both prepared and measured by coupling atomic ensembles to the cavities.
  arXiv  Detail & Related papers  (2020-06-22T10:14:36Z)

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.