Measurements with Position-Momentum Entangled Photons

We constructed a system to generate position-momentum entangled photons. These particles interact non locally therefore anything done to one photon affects the other. We produce 405 nm photons that become two entangled 810 nm photons through the process of spontaneous parametric down conversion. We are able to extract data about the position and momentum properties such as joint uncertainties of these photons. The spatial uncertainty was found through near-field detection, a process where we imaged our crystal onto a single slit. Through far-field detection, we were able to get the momentum uncertainty. This involved focusing the beam onto slits which resulted in a fourier transform. Once optimized, we used our system as the basis for a high-sensitivity magnetic field sensor.