Tunable quantum beat of single photons enabled by nonlinear nanophotonics.

  title={Tunable quantum beat of single photons enabled by nonlinear nanophotonics.},
  author={Qing Li and Anshuman Singh and Xiyuan Lu and John Lawall and Varun B. Verma and Richard P. Mirin and Sae Woo Nam and Kartik Srinivasan},
  journal={Physical review applied},
  volume={12 5}
We demonstrate the tunable quantum beat of single photons through the co-development of core nonlinear nanophotonic technologies for frequency-domain manipulation of quantum states in a common physical platform. Spontaneous four-wave mixing in a nonlinear resonator is used to produce non-degenerate, quantum-correlated photon pairs. One photon from each pair is then frequency shifted, without degradation of photon statistics, using four-wave mixing Bragg scattering in a second nonlinear… 

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