Hong-Ou-Mandel interferometry on a biphoton beat note

  title={Hong-Ou-Mandel interferometry on a biphoton beat note},
  author={Yuanyuan Chen and Matthias Fink and Fabian Steinlechner and Juan P. Torres and Rupert Ursin},
  journal={npj Quantum Information},
Hong-Ou-Mandel interference, the fact that identical photons that arrive simultaneously on different input ports of a beam splitter bunch into a common output port, can be used to measure optical delays between different paths. It is generally assumed that great precision in the measurement requires that photons contain many frequencies, i.e., a large bandwidth. Here we challenge this “well-known” assumption and show that the use of two well-separated frequencies embedded in a quantum entangled… 

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