A Proposal for Nonlinear - Optics Based Quantum Gates in Integrated Photonic Circuits

Abstract

A proposal for the implementation of single-qubit quantum gates based on a third order nonlinear process in integrated quantum circuits is presented.

An integrated photonic circuit for color qubit preparation by third-order nonlinear interactions

“…Ideally, the overlap must be perfect for getting a unity fidelity, so the first step in our quest is to guarantee the simultaneous fulfillment of the phasematching conditions for the two processes (SFWM and DFG) at the same central frequencies ω 1 and ω s , which depends on the dispersion properties of the nonlinear media. Note that the material optical properties used in our numerical study correspond to those materials synthesized and characterized by the working group [36], which become essential to make a real connection among simulations, experimental data, and feasible proposals. On the other hand, the waveguide dispersion properties were computed employing the opensource optical eigenmode solver WGMODES [48], by using as free parameters the width (w) and the height (h) of the waveguide cores, while the height of the silicon dioxide layer was set to 1 µm.…”

“…We propose an integrated photonic circuit for colorqubit quantum gate implementation based on silicon nitride rectangular waveguides lying above a plane substrate of silicon dioxide on silicon, as shown in the inset of Figure 1 [36]. The device integrates the stages for single-photon state generation by SFWM and the qubit preparation/rotation by DFG.…”