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Interference: Path Lengths

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

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Related Experiment Video

Updated: Aug 5, 2025

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

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

Published on: September 5, 2019

Eliminating temporal correlation in quantum-dot entangled photon source by quantum interference.

Run-Ze Liu¹, Yu-Kun Qiao¹, Han-Sen Zhong¹

¹Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.

Science Bulletin

|March 29, 2023

Summary

This summary is machine-generated.

Semiconductor quantum dots can now generate higher-quality multi-photon states. Quantum interference improves entanglement fidelity for scalable quantum information applications.

Keywords:

Entangled photon source Microcavity Quantum information Quantum interference Single quantum dot

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Last Updated: Aug 5, 2025

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Area of Science:

Quantum Information Science
Solid-State Physics
Photonics

Background:

Semiconductor quantum dots offer deterministic photon pair generation with high polarization entanglement fidelity.
Cascaded emission in quantum dots limits photon indistinguishability, hindering scalability for multi-photon experiments.

Purpose of the Study:

To overcome limitations in photon indistinguishability caused by temporal correlations in quantum dot emissions.
To enhance the fidelity of multi-photon entangled states generated by quantum dots.

Main Methods:

Utilizing quantum interference techniques to decouple polarization entanglement from temporal correlations.
Implementing a novel method to improve the quality of four-photon Greenberger-Horne-Zeilinger (GHZ) states.

Main Results:

Achieved a significant improvement in four-photon GHZ state entanglement fidelity, increasing it from (58.7±2.2)% to (75.5±2.0)%.
Demonstrated a method to enhance photon indistinguishability by managing temporal correlations.

Conclusions:

Quantum interference is a viable strategy to improve multi-photon entanglement quality from quantum dots.
This work enables scalable and high-fidelity multi-photon state generation, crucial for advancing quantum information processing.