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We consider a model for an oscillatory, relativistic acceleratingphotodetector inside a cavity and show that the entangled photon pairproduction from the vacuum (Unruh effect) can be accurately described in thesteady state by a non-degenerate parametric amplifier (NDPA), with thedetector's accelerating center of mass serving as the parametric drive (pump).We propose an Unruh effect analogue NDPA microwave superconducting circuitscheme, where the breathing mode of the coupling capacitance between the cavityand detector provides the mechanical pump. For realizable circuit parameters,the resulting photon production from the vacuum should be detectable.

Mechanically Generating Entangled Photons from the Vacuum: A Microwave Circuit-Acoustic Resonator Analogue of the Unruh Effect