Wed·Nov 10, 2021Wednesday·November 10, 2021

1. 01*

   Lattice Lindblad simulation

   Tomoya Hayata🇯🇵 · Yoshimasa Hidaka🇯🇵 · Arata Yamamoto🇯🇵

   We perform the real-time lattice simulation of an open quantum system, which is based on the Schwinger-Keldysh path integral representation of the Lindblad formalism. Although the real-time simulation generally suffers from the sign problem, there exist a few exceptional cases. We focus on a sign-problem-free system of a non-relativistic spinless fermion and analyze time evolution under driving and dissipation.

   hep-lathep-phhep-thquant-phPTEP(2022)·19 citations
2. 02*

   Object-oriented implementation of algebraic multi-grid solver for lattice QCD on SIMD architectures and GPU clusters

   Issaku Kanamori🇯🇵 · Ken-Ichi Ishikawa🇯🇵 · Hideo Matsufuru🇯🇵

   A portable implementation of elaborated algorithm is important to use variety of architectures in HPC applications. In this work we implement and benchmark an algebraic multi-grid solver for Lattice QCD on three different architectures, Intel Xeon Phi, Fujitsu A64FX, and NVIDIA Tesla V100, in keeping high performance and portability of the code based on the object-oriented paradigm. Some parts of code are specific to an architecture employing appropriate data layout and tuned matrix-vector multiplication kernels, while the implementation of abstract solver algorithm is common to all architectures. Although the performance of the solver depends on tuning of the architecture-dependent part, we observe reasonable scaling behavior and better performance than the mixed precision BiCGSstab solvers.

   hep-latLNCS, volume 12953, pp. 1-16, 2021·3 citations
3. 03*

   B- and D-meson semileptonic decays with highly improved staggered quarks

   William I Jay🇺🇸 · Andrew Lytle🇺🇸 · Carleton DeTar🇺🇸 · Aida El-Khadra🇺🇸 · Elvira Gamiz🇪🇸 · Zechariah Gelzer🇺🇸 · Steven Gottlieb🇺🇸 · Andreas Kronfeld🇺🇸 · Jim Simone🇺🇸 · Alejandro Vaquero (for the Fermilab Lattice and MILC Collaborations)🇺🇸

   We present results for $B_{(s)}$- and $D_{(s)}$-meson semileptonic decays from ongoing calculations by the Fermilab Lattice and MILC Collaborations. Our calculation employs the highly improved staggered quark (HISQ) action for both sea and valence quarks and includes several ensembles with physical-mass up, down, strange, and charm quarks and lattice spacings ranging from $a\approx 0.15$ fm down to 0.06 fm. At most lattice spacings, an ensemble with physical-mass light quarks is included. The use of the highly improved action, combined with the MILC Collaboration's gauge ensembles with lattice spacings down to $a\approx 0.042$ fm, allows heavy valence quarks to be treated with the same discretization as the light and strange quarks. This unified treatment of the valence quarks allows (in some cases) for absolutely normalized currents, bypassing the need for perturbative matching, which has been a leading source of uncertainty in previous calculations of $B$-meson decay form factors by our collaboration. All preliminary form-factor results are blinded.

   hep-latPoS(2022)·9 citations
4. 04*

   Machine learning approaches to the QCD transition

   Andrea Palermo🇮🇹 · Lucio Anderlini🇮🇹 · Maria Paola Lombardo🇮🇹 · Andrey Kotov🇩🇪 · Anton Trunin🇷🇺

   We study the high temperature transition in pure $SU(3)$ gauge theory and in full QCD with 3D-convolutional neural networks trained as parts of either unsupervised or semi-supervised learning problems. Pure gauge configurations are obtained with the MILC public code and full QCD are from simulations of $N_f=2+1+1$ Wilson fermions at maximal twist. We discuss the capability of different approaches to identify different phases using as input the configurations of Polyakov loops. To better expose fluctuations, a standardized version of Polyakov loops is also considered.

   hep-latcond-mat.stat-mechhep-thPoS(2022)·5 citations
5. 05*

   Toward dense QCD in quantum computers

   Arata Yamamoto🇯🇵

   Lattice QCD at nonzero baryon density is a big challenge in hadron physics. In this presentation, I discuss the quantum computation of lattice gauge theory at nonzero density. I show some benchmark results of the Schwinger model obtained by the quantum adiabatic algorithm and the quantum variational algorithm.

   hep-latPoS(2021)·5 citations
6. 06*

   Duality as a Feasible Physical Transformation

   Shachar Ashkenazi🇮🇱 · Erez Zohar🇮🇱

   Duality transformations are very important in both classical and quantum physics. They allow one to relate two seemingly different formulations of the same physical realm through clever mathematical manipulations, and offer numerous advantages for the study of many-body physics. In this work, we suggest a method which shall introduce them to the world of quantum simulation too: a feasible scheme for implementing duality transformations as physical operations, mapping between dual quantum states showing the same observable physics, rather than just a mathematical trick. Demonstrating with Abelian lattice models, we show how duality transformations could be implemented in the laboratory as sequences of single- and two-body operations - unitaries and measurements.

   ↳ quant-phcond-mat.str-elhep-latPRA(2022)·25 citations
7. 07*

   Investigating the variance increase of readout error mitigation through classical bit-flip correction on IBM and Rigetti quantum computers

   Constantia Alexandrou🇨🇾 · Lena Funcke🇺🇸 · Tobias Hartung🇬🇧 · Karl Jansen🇩🇪 · Stefan Kühn🇨🇾 · Georgios Polykratis🇨🇾 · Paolo Stornati🇩🇪 · Xiaoyang Wang🇨🇳 · Tom Weber🇩🇪

   Readout errors are among the most dominant errors on current noisy intermediate-scale quantum devices. Recently, an efficient and scaleable method for mitigating such errors has been developed, based on classical bit-flip correction. In this talk, we compare the performance of this method for IBM's and Rigetti's quantum devices, demonstrating how the method improves the noisy measurements of observables obtained on the quantum hardware. Moreover, we examine the variance amplification to the data after applying of our mitigation procedure, which is common to all mitigation strategies. We derive a new expression for the variance of the mitigated Pauli operators in terms of the corrected expectation values and the noisy variances.Our hardware results show good agreement with the theoretical prediction, and we demonstrate that the increase of the variance due to the mitigation procedure is only moderate.

   ↳ quant-phhep-latPoS(2022)·15 citations
8. 08*

   Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays

   Douglas Bryman🇨🇦 · Vincenzo Cirigliano🇺🇸 · Andreas Crivellin🇨🇭 · Gianluca Inguglia🇦🇹

   We present an overview of searches fo violation of lepton flavor universality with focus on low energy precision probes using pions, kaons, tau leptons, and nuclear beta decays. The current experimental results are reviewed, the theoretical status within the context of the Standard Model is summarized, and future prospects (both experimental and theoretical) are discussed. We review the implications of these measurements for physics beyond the Standard Model by performing a global model-independent fit to modified $W$ couplings to leptons and four-fermion operators. We also discuss new physics in the context of simplified models and review Standard Model extensions with focus on those which can explain a possible deviation from unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

   ↳ hep-phhep-exhep-latnucl-ex+1Ann.Rev.Nucl.Part.Sci.(2022)·71 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.