Real-time spectral characterization of a photon pair source using a chirped supercontinuum seed

Area of Science:

• Quantum Optics
• Quantum Information Science

Background:

• Photon pair sources are vital for quantum photonic experiments and protocols.
• Precise control over spectral correlations between photon pairs is often required.
• Measuring joint spectral properties of photon pair sources is historically challenging and time-consuming due to low cross-sections.

Purpose of the Study:

• To present a novel approach for real-time measurement of joint spectral properties.
• To investigate a fiber-based four-wave mixing source.
• To significantly reduce the time required for joint spectral measurements.

Main Methods:

• Utilizing a fiber-based four-wave mixing source.
• Seeding the four-wave mixing process with a broadband chirped pulse.
• Studying the stimulated process to infer spontaneous process properties.
• Comparing stimulated emission measurements with spontaneous process measurements for validation.

Main Results:

• Demonstrated real-time measurement of joint spectral properties in 5-30 seconds.
• Achieved substantial improvement over historical measurement times (hours) and recent techniques (minutes).
• Confirmed the validity of the technique by comparing stimulated and spontaneous emission measurements.

Conclusions:

• The presented approach offers a significant advancement in measuring joint spectral properties of photon pair sources.
• The technique provides benefits such as flexible resolution, large measurement bandwidth, and reduced experimental overhead.
• This rapid measurement capability will accelerate research and development in quantum photonics and related fields.