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Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Frequency-space few-photon diode effect.

Zonghao Liu, Xinyu Shi, Leihua Liu

|December 19, 2025

Summary

This summary is machine-generated.

This study demonstrates a novel quantum diode using cavity dissipation. It achieves efficient single-photon directionality and maintains strong diode characteristics for two photons.

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Area of Science:

Quantum optics
Nonlinear photonics
Quantum information science

Background:

Coherent few-photon transport is crucial for quantum technologies.
Dissipative nonlinear cavities offer unique control over light-matter interactions.
Understanding photon transport in coupled systems is essential for device development.

Purpose of the Study:

To investigate coherent few-photon transport in a dissipative nonlinear cavity coupled to a waveguide.
To analytically derive solutions for cavity dissipation's role in the few-photon diode effect.
To establish a theoretical foundation for quantum diode devices.

Main Methods:

Derivation of analytical solutions for photon transport.
Analysis of a dissipative nonlinear cavity coupled to a 1D waveguide.
Investigation under specific conditions: Γ/κ = 1 and γ1 = 0Γ.

Main Results:

An efficient single-photon diode effect is demonstrated, with perfect transmission from the left and complete absorption from the right.
Strong diode characteristics are maintained for two photons, with near-total dissipation (>99%) for right incidence.
Cavity dissipation at Γ/κ = 1 optimizes directional photon suppression.

Conclusions:

Cavity dissipation effectively regulates the few-photon diode effect.
The demonstrated system provides a robust theoretical framework for quantum diode devices.
This research advances integrated quantum optics and quantum information processing.