Title: Quantum Optical Magnetic Field Sensor

We plan to use the properties of quantum-entangled photons with Faraday's effect to develop a magnetic field sensor with enhanced properties as compared to existing sensors. The Faraday effect is the rotation of polarized light passing through certain materials in the presence of a magnetic field. Light polarization will rotate based on the length of the material, the magnetic field strength and the property of the material known as Verdet constant. In the lab we used two different crystals, Cd0.57Mn0.43Te and Cd0.86Mn0.14Te. For the initial calibration portion of the experiment, we use a laser, a polarizing beam splitter, the Faraday crystal, a linear polarizer, and a power meter. We recorded the power of the beam using the power meter as a function of polarization angle. We are performing the measurement at various distances of the crystal from the magnet to compare the measured field to the theoretical field distribution from the magnet. Currently, we are completing alignment checks of the very sensitive quantum entanglement system as it needs to be optimized before being incorporated into the magnetic field sensor. We will be using entangled photons as a source that will provide unique properties to the Faraday effect sensor.