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Electrical-control of third-order nonlinearity via Fano interference
Deniz Eren Mol1,2, İbrahim Asrın Üzgüc3, Ulaş Eyüpoğlu4
1Institute of Nuclear Sciences, Hacettepe University, Ankara 06800, Türkiye.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 10, 2026
Summary
Researchers demonstrate a new optical component for photonic quantum computers (PQCs) that uses Fano interference and Stark effect. This allows for tunable third-order nonlinearity, enabling faster continuous-variable (CV) gates with picosecond response times.
Area of Science:
- Photonics
- Quantum Computing
- Nanophotonics
Background:
- State-of-the-art photonic quantum computers (PQCs) can implement phase-shift and displacement gates electrically.
- Efficient PQCs require tunable third or higher-order nonlinearity for faster continuous-variable (CV) gates.
Purpose of the Study:
- To demonstrate an optical component for tunable third-order nonlinearity in PQCs.
- To utilize Fano interference and Stark effect in a nonlinear nanoplasmonic system.
Main Methods:
- Coupling a broadband bright plasmon mode to narrow linewidth quantum object(s) (QOs).
- Tuning QO level-spacing via Stark effect to control third-order nonlinearity.
- Utilizing finite-difference time domain (FDTD) simulations with retardation effects.
Main Results:
- Continuous tuning of third-order nonlinearity gate achieved with picosecond response time.
- Fano interference enhancement degrades with random QO positioning due to phase variations.
- Importance of spatial extent of QO-ensemble highlighted for experimental success.
Conclusions:
- A novel nonlinear nanoplasmonic system enables electrically-tunable third-order nonlinearity for PQCs.
- Stark effect provides a mechanism for rapid tuning of CV gates.
- Precise spatial arrangement of quantum objects is crucial for maximizing Fano interference enhancement.
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