Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session FN: Minisymposium: Developments in Quantum Simulations for Nuclear Physics III: simulations I |
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Chair: Natalie Klco, Caltech Room: Studio 1 |
Tuesday, October 12, 2021 2:00PM - 2:12PM |
FN.00001: Quantum Simulations of Effective Theories Christian W Bauer Simulations of Quantum Field Theories (QFT) on quantum devices allow to compuate the full dynamics of a QFT from first principles. However, quantum simulations of QFTs over the full energy range of collider experiments have prohibitive resouce requirements. Simulating the dynamics of effective field theories allows to capture the main effects that can not be computed classically. We illustrate this by computing the soft function in Soft-Collinear Effective Theory, which provides the dominant long distance contribution in jet physics. |
Tuesday, October 12, 2021 2:12PM - 2:24PM |
FN.00002: Accessing scattering amplitudes using quantum computers Juan V Guerrero, Raul A Briceno, Maxwell Hansen, Alexandru M Sturzu Future quantum computers may serve as a tool to access non-perturbative real-time correlation functions. In this talk, we discuss the prospects of using these to study Compton scattering for arbitrary kinematics. In particular, the need to restrict the size of the spacetime in quantum computers prohibits a naive determination of such amplitudes. However, we present a practical solution to this challenge that may allow for future determinations of deeply virtual Compton scattering amplitudes, as well as many other reactions that are presently outside the scope of standard lattice QCD calculations. |
Tuesday, October 12, 2021 2:24PM - 2:36PM |
FN.00003: Quantum simulation of quantum field theory in the light-front formulation Peter J Love Quantum field theory is a natural target for simulation on future quantum computers. We will discuss such simulations in the light-front formulation of quantum field theory. This formulation has several appealing features for such simulations foremost of which is the several similarities to quantum chemistry where much effort has already been expended in developing and optimizing quantum simulation techiniques. I will present work based on the discrete lightcone quantization (DLCQ) of the massive Yukawa model and phi-fourth theory. We will discuss error scalings in comparison with alternative approaches. We will also discuss the application of quantum simulation techniques based on sparse matrices to DLCQ, which may be of broad interest beyond the light-front formulation. |
Tuesday, October 12, 2021 2:36PM - 2:48PM |
FN.00004: Quantum Simulation of Nuclear Physics on NISQ devices using Basis Light-Front Quantization Michael Kreshchuk, Gary R Goldstein, Peter J Love, William M Kirby, Shaoyang Jia, James P Vary The light-front quantization provides a natural framework for digital quantum simulation of quantum field theory. In our previous work (2002.04016, 2105.10941), we demonstrated this by developing quantum algorithms based on simulating time evolution and adiabatic state preparation. Aiming for NISQ devices, in my talk I will explain how to formulate the relativistic bound state problem as an instance of the Variational Quantum Eigensolver (VQE) algorithm using the Basis Light-Front Quantization (BLFQ) technique (2011.13443, 2009.07885). Having much in common with ab initio quantum chemistry and nuclear theory, the BLFQ formulation provides an ideal framework for benchmarking NISQ devices and testing existing algorithms on physically relevant problems such as the calculation of hadronic spectra and parton distribution functions. |
Tuesday, October 12, 2021 2:48PM - 3:00PM |
FN.00005: Prospects for first-principle calculations of viscosity on a quantum computer Yukari Yamauchi Applications of quantum computing to nuclear physics have been studied intensively in recent years. One natural application is the simulation of real-time dynamics of QCD matter via first principles, which is difficult on a classical computer due to the sign problem. In this talk, I propose a quantum algorithm for computing the shear viscosity, a central non-equilibrium property of QCD. I focus on the SU(3) Yang-Mills and describe the two building blocks of the algorithm: the preparation of a thermal state with temperature near the phase transition and the implementation of correlators of the energy-momentum tensor in the Hamiltonian formulation on a lattice. The shear viscosity is extracted from the correlators of the energy-momentum tensor. Due to the limitation of resources, such a calculation on a quantum computer is possible only for small-volume systems in the foreseeable future. I discuss finite-volume effects on the computation of the shear viscosity in the context of the quantum algorithm. |
Tuesday, October 12, 2021 3:00PM - 3:12PM |
FN.00006: Qubit regularization of gauge theories Hanqing Liu, Shailesh Chandrasekharan We discuss the qubit regularization of traditional lattice spin models and lattice gauge theories. Depending on the regularization procedure, the microscopic qubit building blocks satisfy different embedding algebras. We discuss the role of the Peter-Weyl theorem in the regularization procedure, and show how this view point unifies the original D-theory idea and other regularizations being pursued recently. |
Tuesday, October 12, 2021 3:12PM - 3:24PM |
FN.00007: From Nuclear Structure and Reactions to Quantum Information Alexander S Volya, Vladimir G Zelevinsky Atomic nucleus is an open quantum system with bound states and energy-dependent reaction channels that act as multiple entrances and exits for quantum signals transformed by internal many-body interactions. If a nucleus lives in an excited state long enough, it comes to statistical equilibrium. The intrinsic thermalization leads to chaotic states, as we show by the exact solution of quantum equations. The results [1] demonstrate that, in distinction to classical mechanics, quantum interference does not show Lyapunov exponents being close to the limit of random matrices. On the other hand, the time-dependent nuclear process of excitation and deexcitation can be considered as the transmission of a quantum signal. From a stationary picture, we come to the problems of quantum information, with separated or overlapping resonances, possible super-radiance, noise, and decoherence. |
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