Boson Sampling with 20 Input Photons and a 60-Mode Interferometer in a 1 0 14 -Dimensional Hilbert Space

Quantum computing experiments are moving into a new realm of increasing size and complexity, with the short-term goal of demonstrating an advantage over classical computers. Boson sampling is a promising platform for such a goal; however, the number of detected single photons is up to five so far, limiting these small-scale implementations to a proof-of-principle stage. Here, we develop solid-state sources of highly efficient, pure, and indistinguishable single photons and 3D integration of ultralow-loss optical circuits. We perform experiments with 20 pure single photons fed into a 60-mode interferometer. In the output, we detect up to 14 photons and sample over Hilbert spaces with a size up to 3.7×10^{14},…

• NN
  National Natural Science Foundation of China
• CA
  Chinese Academy of Sciences
• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek
• SA
  Science and Technology Commission of Shanghai Municipality