Research ArticleQUANTUM INFORMATION PROCESSING

Experimental scattershot boson sampling

Science Advances  17 Apr 2015:
Vol. 1, no. 3, e1400255
DOI: 10.1126/sciadv.1400255

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Abstract

Boson sampling is a computational task strongly believed to be hard for classical computers, but efficiently solvable by orchestrated bosonic interference in a specialized quantum computer. Current experimental schemes, however, are still insufficient for a convincing demonstration of the advantage of quantum over classical computation. A new variation of this task, scattershot boson sampling, leads to an exponential increase in speed of the quantum device, using a larger number of photon sources based on parametric down-conversion. This is achieved by having multiple heralded single photons being sent, shot by shot, into different random input ports of the interferometer. We report the first scattershot boson sampling experiments, where six different photon-pair sources are coupled to integrated photonic circuits. We use recently proposed statistical tools to analyze our experimental data, providing strong evidence that our photonic quantum simulator works as expected. This approach represents an important leap toward a convincing experimental demonstration of the quantum computational supremacy.

Keywords
  • Boson Sampling
  • Integrated quantum photonics
  • Quantum information processing
  • Quantum walk
  • Quantum simulations
  • Quantum optics
  • Quantum supremacy
  • Multiphoton quantum interference
  • Bosonic coalescence

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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