A 405-nm diode laser pumped a PPKTP (periodically poled KTP crystal) to generate pairs of 810 nm via type II spontaneous parametric downconversion. The resulting single-channel count rate and two-channel coincidence count rate reached 510,000 and 120,000, respectively. The generated photon pairs then passed an 810-nm band-pass filter and a polarized beam splitter to be divided to two purified components of horizontal and vertical polarization. The vertically polarized photon was coupled into a single-mode optical fiber and then injected into the photonic chips, whereas the horizontally polarized photon was connected to a single-photon detector that sets a trigger for heralding the vertically polarized photons on the ICCD camera with a time slot of 10 ns. Lacking an external trigger, the measured patterns would come from light in thermal states rather than single-photon states. The ICCD camera captured each evolution pattern from the photon output end of the photonic chip, after accumulating single-photon injections in the “external” mode for around an hour.

Note: The content above has been extracted from a research article, so it may not display correctly.

Please log in to submit your questions online.
Your question will be posted on the Bio-101 website. We will send your questions to the authors of this protocol and Bio-protocol community members who are experienced with this method. you will be informed using the email address associated with your Bio-protocol account.

We use cookies on this site to enhance your user experience. By using our website, you are agreeing to allow the storage of cookies on your computer.