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Related Experiment Video

Updated: May 6, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Reconfigurable quantum photonic circuits based on quantum dots.

Adam McCaw¹, Jacob Ewaniuk¹, Bhavin J Shastri^1,2

¹Centre for Nanophotonics, Department of Physics, Engineering Physics & Astronomy, Queen's University, 64 Bader Lane, K7L 3N6, Kingston, Ontario, Canada.

Nanophotonics (Berlin, Germany)

|July 15, 2024

Summary

This summary is machine-generated.

Quantum dots can act as reconfigurable phase shifters in quantum photonic circuits, enabling high-fidelity quantum information processing. This approach overcomes limitations of traditional components, paving the way for scalable quantum technologies.

Keywords:

chiral quantum optics phase shifters photonic integrated circuits programmable quantum information processing solid-state quantum emitters

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Last Updated: May 6, 2026

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Area of Science:

Quantum Information Science
Nanophotonics
Solid-State Physics

Background:

Quantum photonic integrated circuits (QPICs) are crucial for quantum information processing.
Current QPICs use classical components for phase shifting, limiting scalability and integration.
Quantum dots are typically used as single-photon sources, not active circuit elements.

Purpose of the Study:

To demonstrate quantum dots as reconfigurable phase shifters in QPICs.
To assess the feasibility and fidelity of quantum dot-based phase shifters.
To explore the scalability and performance of these novel circuits.

Main Methods:

Numerical modeling using established literature parameters.
Simulation of quantum dot behavior as phase shifters.
Analysis of unitary infidelity considering quantum dot imperfections and standard losses.

Main Results:

Quantum dots can function as high-fidelity reconfigurable phase shifters.
Optimized circuits show minimal impact from quantum dot imperfections (infidelity < 0.001 for 10 modes).
Achieved fidelities of 0.9998 for controlled-phase and NOT gates without redundancies.

Conclusions:

Quantum dots are viable for active quantum information processing in photonic circuits.
This approach enables scalable, cryogenically-compatible, fast, and low-loss reconfigurable QPICs.
Paves the way for next-generation quantum computing hardware.