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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Stimulated Generation of Indistinguishable Single Photons from a Quantum Ladder System.

Friedrich Sbresny¹, Lukas Hanschke¹, Eva Schöll²

¹Walter Schottky Institut, Department of Electrical and Computer Engineering and MCQST, Technische Universität München, 85748 Garching, Germany.

Physical Review Letters

|March 18, 2022

Summary

We present a new method for generating highly indistinguishable single photons using semiconductor quantum dots. This technique significantly improves photon quality for quantum applications.

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Area of Science:

Quantum optics
Solid-state physics
Photonics

Background:

Semiconductor quantum dots are promising sources for single photons.
Achieving high indistinguishability and brightness is crucial for quantum technologies.
Previous excitation methods faced limitations in photon quality and control.

Purpose of the Study:

To develop and demonstrate a novel scheme for generating highly indistinguishable single photons.
To leverage resonant two-photon excitation and stimulated emission for enhanced photon generation.
To improve photon brightness and polarization control in quantum dot systems.

Main Methods:

Resonant two-photon excitation of the biexciton in quantum dots.
Stimulation of the biexciton to selectively prepare an exciton.
Quantum-optical simulations and experimental validation.
Precise timing of stimulation pulses and polarization control.

Main Results:

Demonstrated significant advantages over existing excitation methods.
Achieved ultralow multiphoton errors due to suppressed re-excitation.
Obtained very low timing jitter, leading to high photon indistinguishability.
Enabled deterministic programming of photon polarization (H or V) for enhanced brightness.

Conclusions:

The proposed scheme offers a robust method for generating high-quality single photons.
This technique overcomes key limitations of previous quantum dot excitation methods.
The ability to control polarization and achieve high indistinguishability opens new avenues for quantum information processing.