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Nuclear Theory·nucl-th

Wednesday·December 1, 2021

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    [Submitted on 24 Nov 2021] (cross-list from quant-ph)

    Quantum state preparation by adiabatic evolution with customized gates

    E. A. Coello Perez🇺🇸 · J. Bonitati🇺🇸 · D. Lee🇺🇸 · S. Quaglioni🇺🇸 · K. A. Wendt🇺🇸

    Quantum state preparation by adiabatic evolution is currently rendered ineffective by the long implementation times of the underlying quantum circuits, comparable to the decoherence time of present and near-term quantum devices. These implementation times can be significantly reduced by realizing the evolution with a minimal number of customized gates. Employing a realistic model of a two-qubit processor, we carried out classical device-level simulations of the adiabatic evolution of a two-spin system implemented with customized two-qubit gates. These device-level simulations were compared with (experimental) ones solving the same problem on IBMQ systems. When used to emulate the IBMQ quantum circuit, our device-level simulations reached state fidelities ranging from 65% to 85%, similar to the actual performance of a diverse set of IBMQ devices.When we reduced the implementation time by using a minimal number of customized gates, however, the loss of fidelity was reduced by at least a factor of four, allowing us to accurately extract the energy of the target state. This improvement is enough to render adiabatic evolution useful for quantum state preparation for small systems or as a preconditioner for other state preparation methods.

    Comments:
    12 pages, 10 figures
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    2111.12207 [pdf]
    PRA(2022)·27 citations
  2. 09

    [Submitted on 29 Nov 2021] (cross-list from hep-ph)

    Dynamics of quarks and gauge fields in the lowest-energy states in QCD and QED

    Cheuk-Yin Wong🇺🇸 · Andrew V. Koshelkin🇷🇺

    We examine the dynamics of quarks and gauge fields in the lowest energy states in the QED and QCD interactions by combining Schwinger's longitudinal confinement in (1+1)D with Polyakov's transverse confinement in (2+1)D in a ``stretch (2+1)D'' flux tube model in (3+1)D. For such QED and QED systems in the flux tube configuration with cylindrical symmetry, we separate out the transverse and longitudinal degrees of freedom, approximate the non-Abelian QCD in the quasi-Abelian approximation, and solve the derived equations to study the collective excitations. We find stable collective QED and QCD excitations showing up as confined QED and QCD mesons, in support of previous theoretical studies and recent observations of the anomalous hypothetical X17 and E38 particles. Future theoretical lattice gauge calculations of QED in (3+1)D with the inclusion of the Schwinger longitudinal confinement mechanism and experimental confirmation of the hypothetical X17 and E38 particles will shed definitive light on quark confinement in the QED interaction in (3+1)D.

    Comments:
    34 pages, 2 figures,
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2111.14933 [pdf]
    EPJA(2023)·12 citations
  3. 10

    [Submitted on 30 Nov 2021] (cross-list from hep-ph)

    Nonequilibrium evolution of quarkonium in medium

    Yukinao Akamatsu🇯🇵 · Takahiro Miura🇯🇵

    We review recent progress in open quantum system approach to the description of quarkonium in the quark-gluon plasma. A particular emphasis is put on the Lindblad equations for quarkonium and its numerical simulations.

    Comments:
    11 pages, 3 figures, Proceedings for "A Virtual Tribute to Quark Confinement and the Hadron Spectrum" (August 2nd-6th 2021, online)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2111.15402 [pdf]
    EPJ Web Conf.(2022)·8 citations
  4. 11

    [Submitted on 30 Nov 2021] (cross-list from hep-lat)

    Investigations of decuplet baryons from meson-baryon interactions in the HAL QCD method

    Kotaro Murakami🇯🇵 · Yutaro Akahoshi🇯🇵 · Sinya Aoki🇯🇵 · Kenji Sasaki🇯🇵

    We study decuplet baryons from meson-baryon interactions, in particular, and baryons from P-wave and interactions, respectively. The interaction potentials are calculated in the HAL QCD method using 3-quark-type source operators at . We use the conventional stochastic estimation of all-to-all propagators combined with the all-mode averaging to reduce statistical fluctuations. We have found that two potentials have quite similar behaviors, suggesting that a mass difference between and comes mainly from a difference of kinematical structure between and , rather than their interactions. The scattering phase shifts calculated from the potentials indicate that and baryons exist as bound states in this lattice setup, whose binding energies are consistent with those obtained from 2-point functions.

    Comments:
    9 pages, 3 figures, 1 table, talk presented at The 38th International Symposium on Lattice Field Theory, LATTICE2021, 26th-30th July 2021, Zoom/Gather@Massachusetts Institute of Technology
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2111.15563 [pdf]
    PoS(2022)·0 citations
  5. 12

    [Submitted on 30 Nov 2021] (cross-list from hep-lat)

    Lattice QCD at Imaginary Chemical Potential in the Chiral Limit

    D. A. Clarke🇩🇪 · Jishnu Goswami🇩🇪 · F. Karsch🇩🇪 · Anirban Lahiri🇩🇪 · M. Neumann🇩🇪 · C. Schmidt🇩🇪

    We report on an ongoing study on the interplay between Roberge-Weiss (RW) and chiral transitions in simulations of (2+1)-flavor QCD with an imaginary chemical potential. We established that the RW endpoint belongs to the 3-, universality class when calculations are done with the Highly Improved Staggered Quark (HISQ) action in the RW plane with physical quark masses. We also have explored a range of quark masses corresponding to pion mass values, ~MeV and found that the transition is consistent with universality class. We argue that observables that were usually used to determine the chiral phase transition temperature, e.g. the chiral condensate and chiral susceptibility, are sensitive to the RW transition and are energy-like observables for the transition, contrary to the magnetic-like (order parameter) behavior at vanishing chemical potential. Moreover the calculations performed at ~MeV also put a stringent constraint for a critical pion mass at zero chemical potential for a possible first-order chiral phase transition.

    Comments:
    Prepared for the proceedings of LATTICE2021, MIT, USA, online
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2111.15621 [pdf]
    PoS(2022)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE