Fig. 4: Hong-Ou-Mandel (HOM) interference between two photons with different frequencies. | Light: Science & Applications

Fig. 4: Hong-Ou-Mandel (HOM) interference between two photons with different frequencies.

From: Spectral control of nonclassical light pulses using an integrated thin-film lithium niobate modulator

Fig. 4

a HOM interference set-up. The two input photons have FWHM bandwidth of 200 GHz and frequency difference of 154 GHz. The TFLN modulator was used to redshift the blue-detuned photon and erase the spectral distinguishability. The modulator was driven at 4.0 Vπ with a 13.6 GHz sinusoidal RF signal. b Normalized coincidence rates after background subtraction as a function of path length delay. When the shearing was turned on, the interference visibility increased from 23.1 ± 3.1% (due to partial spectral overlap) to 90.5 ± 4.3%. Error bars indicate one standard deviation assuming Poisson counting statistics. Solid lines: Gaussian fitting

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