Forbidden High Harmonics in Graphene Could Probe Quantum Fluctuations of Light
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On October 20, 2026, Phys.org reported a theoretical study by Kartik Prabhu and Gopal Dixit of IIT Bombay proposing the use of graphene as a sensor to detect quantum fluctuations of incident light. The study suggests that when two counter-rotating circularly polarized squeezed quantum light beams at a 2:1 frequency ratio illuminate graphene, normally forbidden high harmonics at odd multiples of the fundamental frequency are activated, revealing the quantum fluctuation properties of the light. The work remains a theoretical proposal, with no experimental verification reported so far.
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- Phys.org Optics & PhotonicsIIT Bombay Theory: Forbidden High-Harmonic Emission in Graphene Could Reveal Quantum Fluctuations of Incident Light
Kartik Prabhu and Gopal Dixit of IIT Bombay propose using graphene as a sensor to detect quantum fluctuations of light: when graphene is illuminated by squeezed quantum light with two counter-rotating circular polarizations at a 2:1 frequency ratio, normally forbidden high-harmonic signals at integer multiples of three times the fundamental frequency are activated.
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