Quantum Crosstalk Research Articles

A thermodynamic approach to linear and quantum cross-talk in multimode fiber systems

A thermodynamic approach to linear and quantum cross-talk in multimode fiber systems

Quantum model of light transmission in array waveguide gratings

We develop, to the best of our knowledge, the first model for an array waveguide grating (AWG) device subject to quantum inputs and analyze its basic transformation functionalities for single-photon states. A commercial, cyclic AWG is experimentally characterized with weak input coherent states as a means of exploring its behaviour under realistic quantum detection. In particular it is shown the existence of a cutoff value of the average photon number below which quantum crosstalk between AWG ports is negligible with respect to dark counts. These results can be useful when considering the application of AWG devices to integrated quantum photonic systems.