Towards photonic quantum simulation of ground states of frustrated Heisenberg spin systems
Author(s): B. Dakić, S. Kropatschek, W. Naylor, Y. Chan, Z. Gong, L. Duan, A. Zeilinger, P. Walther
Journal: Scientific Reports
DOI Number: 10.1038/srep03583
Link: Link to publication
Photonic quantum simulators are promising candidates for providing insight into other small- to medium-sized quantum systems. The available photonic quantum technology is reaching the state where significant advantages arise for the quantum simulation of interesting questions in Heisenberg spin systems. Here we experimentally simulate such spin systems with single photons and linear optics. The effective Heisenberg-type interactions among individual single photons are realized by quantum interference at the tunable direction coupler followed by the measurement process. The effective interactions are characterized by comparing the entanglement dynamics using pairwise concurrence of a four-photon quantum system. We further show that photonic quantum simulations of generalized Heisenberg interactions on a four-site square lattice and a six-site checkerboard lattice are in reach of current technology.