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Updated: Jun 15, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Ultrafast partial measurement of fourth-order coherence by HBT interferometry of upconversion-based autocorrelation
Alex Hayat1, Amir Nevet, Meir Orenstein
1Department of Electrical Engineering, Technion, Haifa 32000, Israel. ahayat@tx.technion.ac.il
Abstract:
We introduce, analyze, and experimentally demonstrate a compact semiconductor-based scheme for a femtosecond-scale partial fourth-order coherence g((4)) measurements. The scheme is based on a start-stop photon-counting Hanbury Brown and Twiss (HBT) interferometry of an upconversion-based Michelson-interferometer autocorrelation. The experimental realization employs second-harmonic generation in a semiconductor quantum-well structure, which may be further integrated with the HBT setup as a miniature photonic circuit, allowing compact characterization devices for photon-pair statistics in quantum photonics and quantum information processing.
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