Quantum enhancement of accuracy and precision in optical interferometry

Area of Science:

• Quantum Optics
• Optical Metrology
• Materials Science

Background:

• White-light interferometry is a precise tool for optical material property determination.
• Systematic errors from complex data-fitting limit current precision and accuracy.

Purpose of the Study:

• Introduce spectrally resolved quantum white-light interferometry for optical property measurements.
• Measure chromatic dispersion in optical fibers with enhanced accuracy.
• Demonstrate the quantum advantage in precision and photon efficiency.

Main Methods:

• Exploiting spectral and photon-number correlations of energy-time entangled photon pairs.
• Reducing the number of interdependent data-fitting parameters.
• Comparing quantum method with state-of-the-art approaches.

Main Results:

• Achieved 2.4 times better measurement precision compared to conventional methods.
• Required 62 times fewer photons for measurements.
• Enabled absolute determination of material parameters by eliminating systematic errors.

Conclusions:

• Spectrally resolved quantum white-light interferometry offers superior precision and accuracy.
• Quantum optics provides conceptual advantages for optical material characterization.
• This method is poised to set new standards in experimental optical metrology.