Spectroscopy by frequency-entangled photon pairs
Atsushi Yabushita, Takayoshi Kobayashi
Quantum spectroscopy was performed using the frequency-entangled broadband photon pairs generated by spontaneous parametric down-conversion. An absorptive sample was placed in front of the idler photon detector, and the frequency of signal photons was resolved by a diffraction grating. The absorption spectrum of the sample was measured by counting the coincidences, and the result is in agreement with the one measured by a conventional spectrophotometer with a classical light source.
arXiv:quant-ph/0306154•Physical Review A•Jan 14, 2004•136 citations