Quantum state transfer in cavity electro-optic modulators

We study the problem of quantum state transfer from the optical cavity field to the microwave resonator in cavity electro-optic modulators. We give the analytical expression of the transfer fidelities of Gaussian states and some non-Gaussian states. We discuss the influences of the electro-optic coupling strength and the temperature of the environment on the fidelity of the state transfer. We show that it is possible to achieve high transfer fidelity for Gaussian states and some non-Gaussian states. We find that the transfer fidelity of the non-Gaussian state produced by performing the photon-addition operation, the photon-subtraction operation, or the photon-subtraction-then-addition operation on a Gaussian state is lower than that of the corresponding Gaussian state.