Cavity quantum electro-optics. II. Input-output relations between traveling optical and microwave fields

Details Cavity quantum electro-optics. II. Input-output relations between traveling optical and microwave fields Cavity quantum electro-optics. II. Input-output relations between traveling optical and microwave fields

2011-05-11

arxiv.org/abs/1105.2336v2

Physical Review A 84, 043845 (2011)

Physics

Quantum Physics

12 pages, 10 figures, v2: updated and submitted

Scientific paper

10.1103/PhysRevA.84.043845

In the previous paper [M. Tsang, Phys. Rev. A 81, 063837 (2010), e-print arXiv:1003.0116], I proposed a quantum model of a cavity electro-optic modulator, which can coherently couple an optical cavity mode to a microwave resonator mode and enable novel quantum operations on the two modes, including laser cooling of the microwave mode, electro-optic entanglement, and backaction-evading optical measurement of a microwave quadrature. In this sequel, I focus on the quantum input-output relations between traveling optical and microwave fields coupled to a cavity electro-optic modulator. With red-sideband optical pumping, the relations are shown to resemble those of a beam splitter for the traveling fields, so that in the ideal case of zero parasitic loss and critical coupling, microwave photons can be coherently up-converted to "flying" optical photons with unit efficiency, and vice versa. With blue-sideband pumping, the modulator acts as a nondegenerate parametric amplifier, which can generate two-mode squeezing and hybrid entangled photon pairs at optical and microwave frequencies. These fundamental operations provide a potential bridge between circuit quantum electrodynamics and quantum optics.

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