Related Experiment Video
Updated: Feb 3, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
Abstract:
Exceptional points (EPs), that is, branch point singularities of non-Hermitian Hamiltonians, are ubiquitous in optics. So far, the signatures of EPs have been mostly studied assuming classical light. In the passive parity-time (PT) optical coupler, a fingerprint of EPs resulting from the coalescence of two resonance modes is a qualitative change of the photon decay law, from damped Rabi-like oscillations to transparency, as the EP is crossed by increasing the loss rate. However, when probed by nonclassical states of light, quantum interference can hide EPs. Here it is shown that, under excitation with polarization-entangled two-photon states, the EP phase transition is smoothed until it disappears as the effective particle statistics are changed from bosonic to fermionic.
Related Concept Videos
Exceptions to the Octet Rule
Quantum Numbers
Interference and Diffraction
The Quantum-Mechanical Model of an Atom
RNA Interference
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
Interference and Decay
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...

