Wenyang Qian, Quantum simulation in time evolution and bound state problems
In this talk, I will present both decomposition and variation approaches in quantum computing that can be used in high-energy physics. QCD jets provide one of the best avenues to extract information about the quark-gluon plasma produced in ultra-relativistic heavy ion collisions, where quantum simulation can be a useful tool to study jet evolution directly. Based on the light-front Hamiltonian formalism, we construct a digital quantum circuit that tracks the evolution of a single hard probe in the presence of a stochastic color background and obtain quenching parameters using classical simulators. On the other hand, variational quantum computing can also be used to solve hadron structures. We extend the traditional variational quantum eigensolver to the subspace-search variational quantum eigensolver for finding the low-lying meson mass spectrum. We obtain the corresponding light-front wave functions as quantum states from ideal simulators, noisy simulators, and IBM quantum computers, and evaluate their physical properties directly on the quantum circuits.