2019/06/30 by Mikkel V. Larsen, Xueshi Guo, Casper R. Breum +2 · 5 citations
Physics and Astronomy · #quant-ph #physics.optics
paper · pdf · doi:10.1126/science.aay4354
published as Science 366, 369 (2019)
arxiv created 2019/10/29 · arxiv updated 2019/10/30
Measurement-based quantum computation offers exponential computational speed-up via simple measurements on a large entangled cluster state. We propose and demonstrate a scalable scheme for the generation of photonic cluster states suitable for universal measurement-based quantum computation. We exploit temporal multiplexing of squeezed light modes, delay loops, and beam-splitter transformations to deterministically generate a cylindrical cluster state with a two-dimensional (2D) topological structure as required for universal quantum information processing. The generated state consists of more than 30000 entangled modes arranged in a cylindrical lattice with 24 modes on the circumference, defining the input register, and a length of 1250 modes, defining the computation depth. Our demonstrated source of 2D cluster states can be combined with quantum error correction to enable fault-tolerant quantum computation.