Dynamic temperature compensation for wavelength-stable entangled biphoton generation

TL;DR

This paper introduces a real-time temperature compensation method for stabilizing the wavelength of entangled biphotons generated via SPDC in MgO:PPLN waveguides, significantly improving long-term wavelength stability for quantum applications.

Contribution

It presents a novel dynamic temperature compensation technique combining dispersive Fourier transformation and digital control to enhance wavelength stability in entangled photon sources.

Findings

Achieved nearly a hundredfold improvement in wavelength stability.

Reached a stability level of 2.00×10^(-7) at 10,000 seconds.

Demonstrated a simple, active temperature correction method for quantum sources.

Abstract

A dynamic temperature compensation method is presented to stabilize the wavelength of the entangled biphoton source, which is generated via the spontaneous parametric down-conversion based on a MgO: PPLN waveguide. Utilizing the dispersive Fourier transformation technique combined with a digital proportional-integral-differential algorithm, the small amount of wavelength variation can be instantly identified and then compensated with active temperature correction. The long-term wavelength stability, assessed though Allan deviation, shows nearly a hundredfold enhancement, reaching 2.00*10^(-7) at the averaging time of 10000 s. It offers a simple, ready-to-use solution for precise wavelength control in quantum information processing.