Bragg-Grating Enhanced Narrow-Band Spontaneous Parametric Down Conversion
Li Yan, Lijun Ma, and Xiao Tang
TL;DR
This paper introduces a novel approach to produce narrow-linewidth entangled photons by integrating a Bragg grating with a nonlinear crystal waveguide, enhancing SPDC spectral properties for quantum optics applications.
Contribution
It presents a new method of incorporating an internal Bragg grating with a pi-phase shifter into a nonlinear waveguide to narrow the spectral linewidth of entangled photons generated by SPDC.
Findings
Bragg grating with pi-phase shifter effectively narrows photon linewidths.
Theoretical analysis shows improved spectral characteristics of SPDC.
Potential for enhanced quantum communication sources.
Abstract
We propose a new method to narrow the linewidth of entangled photons generated from spontaneous parametric down conversion (SPDC). An internal Bragg grating is incorporated onto a nonlinear optical crystal waveguide. We study theoretically the spectral characteristics of SPDC under two Bragg grating structures. We show that using the Bragg grating with a midway pi-phase shifter, it is a promising way to generate narrow-line entangled photons.
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