Abstract
Not much, in the end. Here we put forward some considerations on how Hong-Ou-Mandel interferometry provides signatures of frequency entanglement in the two-photon state produced by parametric down-conversion. We find that some quantitative information can be inferred in the limit of long-pulse pumping, while the short-pulse limit remains elusive.
Highlights
As quantum technology are reaching beyond the proof-of-principle stage, the use of a reliable and robust way for encoding the information is becoming of paramount importance
Due to the nature of the parametric down-conversion (PDC) process, the photon pairs produced by the scattering of pump photons on the nonlinear crystal, will exhibit correlations in frequency depending on the parameters defining the pump and the phase - matching function
A more conventional approach would consist in performing quantum state tomography of the two-photon state
Summary
As quantum technology are reaching beyond the proof-of-principle stage, the use of a reliable and robust way for encoding the information is becoming of paramount importance. Due to the nature of the PDC process, the photon pairs produced by the scattering of pump photons on the nonlinear crystal, will exhibit correlations in frequency depending on the parameters defining the pump and the phase - matching function.
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