Pulse-regulated single-photon generation via quantum interference in a χ⁽²⁾ nonlinear nanocavity

Area of Science:

• Quantum optics
• Nanophotonics
• Quantum communication

Background:

• Scalable on-chip single-photon sources are crucial for quantum communication networks.
• Telecommunications wavelengths are essential for long-distance quantum information transfer.

Purpose of the Study:

• To numerically construct and analyze a pulse-regulated single-photon source.
• To investigate the impact of excitation pulse width on photon statistics and source brightness.
• To explore resonant operation for improved single-photon generation.

Main Methods:

• Numerical construction of a single-photon source using an optical parametric amplifier in a nanocavity.
• Application of the Monte Carlo wave-function method to study photon statistics under pulsed excitation.
• Analysis of second-order photon correlation function (g(2)(0)) under resonant and non-resonant conditions.

Main Results:

• An optimal excitation pulse width was identified for achieving high-purity single photons.
• Source brightness demonstrated a monotonic increase with increasing excitation pulse width.
• Resonant operation successfully suppressed oscillations in g(2)(0), indicating enhanced single-photon purity.

Conclusions:

• The proposed system offers a scalable on-chip solution for single-photon generation at telecommunications wavelengths.
• Optimized pulsed excitation and resonant operation are key to achieving high-performance quantum sources.
• This work advances the development of essential components for practical quantum communication networks.