Abstract
We demonstrate efficient generation of photon pairs at 1316 nm in a fiber-coupled type-II phase-matched Rb-indiffused waveguide in periodically poled KTiOPO(4). The integrated waveguide source has a pair production rate of 2 x 10(7)/s/mW in a 1.08-nm bandwidth, in good agreement with a theoretical model that takes into account the transversal momentum imparted on the phase matching function by the waveguide. We achieve a Hong-Ou-Mandel quantum-interference visibility of 98.2% after subtraction of accidental coincidences, representing the highest reported value for a waveguide-based photon-pair source.
Highlights
The development of quantum mechanics has opened up new opportunities in many well-established fields such as communication theory, coding and error correction, cryptography, and metrology
We have experimentally demonstrated the production of narrowband correlated photon pairs at 1316 nm using a fiber-coupled type-II phase-matched periodically poled KTiOP04 (PPKTP) waveguide, yielding a source brightness of 2.0 x 107 pairs/s/mW of pump over the measured phase-matching bandwidth of 1.08 nm
We find that the effective grating leads to a broader transverse bandwidth of the signal and idler outputs, which in turn explains the much higher spectral brightness of a waveguide spontaneous parametric downconversion (SPDC) source compared with a bulk-crystal SPDC source
Summary
3-4 Plots of the four lowest order (beside the fundamental mode) eigenmodes for the pump field. 3-5 Plots of the four lowest order (beside the fundamental mode) eigenmodes for the signal field. 3-6 Plots of the four lowest order (beside the fundamental mode) eigenmodes for the idler field. 5-2 Measured HOM coincidences and accidentals counts in 300s as function of the optical path difference between the signal and idler arms at waveguide temperature of 19.5 °C and with 57 f1W pump power. 5-4 Experimental HOM quantum interference visibilities versus the mean pair number within a coincidence window of 2.5 ns. 5-5 Measured HOM coincidence counts in 400s as function of the optical path difference between the signal and idler arms at waveguide temperature of 19.5 °C and with 57 f1W pump power.
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