Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Quantum Information (Quantum Computing and Simulation)

Q 15.5: Vortrag

Dienstag, 15. März 2022, 11:45–12:00, Q-H12

Towards Measurement-Based Variational Quantum Simulation of the Multi-Flavor Schwinger Model — •Stephan Schuster¹, Stefan Kühn², Tobias Hartung^{2, 3}, Lena Funcke⁴, Marc-Oliver Pleinert¹, Joachim von Zanthier¹, and Karl Jansen⁵ — ¹Friedrich-Alexander University Erlangen-Nürnberg (FAU), Staudtstrasse 1, 91058 Erlangen, Germany — ²Computation-Based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, 2121 Nicosia Cyprus — ³Department of Mathematical Sciences, University of Bath, Bath BA2 7AY, United Kingdom — ⁴Center for Theoretical Physics, MIT Department of Physics, 77 Massachusetts Avenue, Cambridge MA 02139 USA — ⁵NIC, Desy Zeuthen, Platanenallee 6, 15738 Zeuthen, Germany

Recently, the first measurement-based variational quantum simulation has been proposed, which employs a one-way quantum computation instead of a quantum circuit for the simulation. This shifts the experimental challenge of complex gate realizations to the generation of a entangled cluster state which is then locally measured. In our work, we developed a variational one-way quantum computing simulation protocol for the multi-flavor lattice Schwinger model with a flavor-dependent chemical potential, considering model-specific symmetries in our quantum algorithm. The flavor-dependent chemical potential increases the model complexity but also allows us to investigate first-order energy phase transitions in dependence of the chemical potential. First classical simulation results of our protocol look very promising and allowed us to determine several critical points in the phase diagram.