Research ArticleQUANTUM OPTICS

Two-photon quantum walk in a multimode fiber

Science Advances  29 Jan 2016:
Vol. 2, no. 1, e1501054
DOI: 10.1126/sciadv.1501054

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Abstract

Multiphoton propagation in connected structures—a quantum walk—offers the potential of simulating complex physical systems and provides a route to universal quantum computation. Increasing the complexity of quantum photonic networks where the walk occurs is essential for many applications. We implement a quantum walk of indistinguishable photon pairs in a multimode fiber supporting 380 modes. Using wavefront shaping, we control the propagation of the two-photon state through the fiber in which all modes are coupled. Excitation of arbitrary output modes of the system is realized by controlling classical and quantum interferences. This report demonstrates a highly multimode platform for multiphoton interference experiments and provides a powerful method to program a general high-dimensional multiport optical circuit. This work paves the way for the next generation of photonic devices for quantum simulation, computing, and communication.

Keywords
  • Random medium
  • scattering medium
  • quantum walks
  • wavefront shaping
  • Transmission matrix
  • photon pairs
  • quantum interferences
  • multimode fiber
  • spatial light modulator

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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