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A combined ferrite parametric amplifier and millimeter-wave homodyneinterferometer are proposed as an ambient temperature Bell Test. It is shownthat the non-linear magnetic susceptibility of the yttrium iron garnet (YIG)ferrite, on account of its narrow line-width Larmor precessional resonance,make it an ideal material for the creation of entangled photons. These can bemeasured using a homodyne interferometer, as the much larger number ofthermally generated photons associated with ambient temperature emission can bescreened out. The proposed architecture may enable YIG quantum technology-basedsensors to be developed, mimicking in the millimeter-wave band the large numberof quantum optical experiments in the near-infrared and visible regions whichhad been made possible by use of the nonlinear beta barium borateferroelectric, an analogue of YIG. It is illustrated here how the YIGparametric amplifier can reproduce quantum optical Type I and Type II waveinteractions, which can be used to create entangled photons in themillimeter-wave band. It is estimated that when half a cubic centimeter of YIGcrystal is placed in a magnetic field of a few Tesla and pumped with 5 Watts ofmillimeter-wave radiation, approximately 0.5x10^12 entangled millimeter-wavephoton pairs per second are generated by the spin-wave interaction. This meansan integration time of only a few tens of seconds is needed for a successfulBell Test. A successful demonstration of this will lead to novel architecturesof entanglement-based quantum technology room temperature sensors,re-envisioning YIG as a modern quantum material.

A millimeter-wave Bell Test using a ferrite parametric amplifier and a homodyne interferometer