Characterization of optical quantum circuits using resonant phase shifts
arXiv:1609.02676 · doi:10.1063/1.4962902
Abstract
We demonstrate that important information about linear optical circuits can be obtained through the phase shift induced by integrated optical resonators. As a proof of principle, the phase of an unbalanced Mach-Zehnder interferometer is determined. Then the method is applied to a complex optical circuit designed for linear optical quantum computation. In this controlled-NOT gate with qubit initialization and tomography stages, the relative phases are determined as well as the coupling ratios of its directional couplers.
Accepted for publication in Appl. Phys. Lett