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Updated: May 26, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
Comment on "Nonreciprocal light propagation in a silicon photonic circuit"
Shanhui Fan1, Roel Baets, Alexander Petrov
1Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA. shanhui@stanford.edu
Abstract:
We show that the structure demonstrated by Feng et al. (Reports, 5 August 2011, p. 729) cannot enable optical isolation because it possesses a symmetric scattering matrix. Moreover, one cannot construct an optical isolator by incorporating this structure into any system as long as the system is linear and time-independent and is described by materials with a scalar dielectric function.
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