AI Article Synopsis
- Researchers developed a super-fast light source using a special type of waveguide, producing pairs of photons that are nearly identical in properties for use in telecom applications.
- They measured the properties of these photon pairs and found that they have very low effective mode numbers, indicating high-quality indistinguishable photons.
- The team demonstrated high levels of interference and purity of the photon states, achieving impressive visibility and efficiency results, suggesting strong potential for quantum applications.
Article Abstract
We implement an ultrafast pulsed type-II parametric down conversion source in a periodically poled KTP waveguide at telecommunication wavelengths with almost identical properties between signal and idler. As such, our source resembles closely a pure, genuine single mode photon pair source with indistinguishable modes. We measure the joint spectral intensity distribution and second order correlation functions of the marginal beams and find with both methods very low effective mode numbers corresponding to a Schmidt number below 1.16. We further demonstrate the indistinguishability as well as the purity of signal and idler photons by Hong-Ou-Mandel interferences between signal and idler and between signal/idler and a coherent field, respectively. Without using narrowband spectral filtering, we achieve a visibility for the interference between signal and idler of 94.8% and determine a purity of more than 80% for the heralded single photon states. Moreover, we measure raw heralding efficiencies of 20.5% and 15.5% for the signal and idler beams corresponding to detector-loss corrected values of 80% and 70%.
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| http://dx.doi.org/10.1364/OE.21.013975 | DOI Listing |
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