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Updated: Feb 11, 2026
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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External quantum efficiency enhancement by photon recycling with backscatter evasion.
Applied Optics
|May 5, 2018
Summary
Researchers enhanced photodiode quantum efficiency (QE) by recycling reflected photons. This technique improves signal quality in quantum optics experiments by reducing photocurrent loss and vacuum fluctuations without increasing backscattered light.
Area of Science:
- Quantum optics
- Photodetector technology
Background:
- Nonunity quantum efficiency (QE) in photodiodes (PD) degrades signal quality in quantum optical experiments.
- Photocurrent loss and vacuum fluctuations are key issues caused by low QE.
Purpose of the Study:
- To demonstrate external QE enhancement in photodiodes by recycling reflected photons.
- To improve signal integrity in quantum optical measurements.
Main Methods:
- Implementing a photon recycling technique for photodiodes.
- Measuring external QE of an InGaAs PD over a range of incident angles.
- Assessing backscattered light levels with the recycling method.
Main Results:
- External QE of an InGaAs PD was enhanced by 0.01-0.06, reaching 0.86-0.92.
- The enhancement was observed across a wide range of incident angles.
- The photon recycling technique did not increase backscattered light when the beam was properly misaligned.
Conclusions:
- Photon recycling is an effective method for enhancing photodiode QE.
- This technique offers a viable solution to improve signal quality in quantum optical experiments.
- The method is practical as it avoids increasing unwanted backscattered light.
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