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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Engineering integrated photonics for heralded quantum gates.

Thomas Meany¹, Devon N Biggerstaff^2,3, Matthew A Broome^2,3

¹Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.

Scientific Reports

|June 11, 2016

Summary

This summary is machine-generated.

Researchers optimized the Knill controlled-Z gate for quantum computing using integrated photonic circuits. The study found device performance is more sensitive to coupler reflectivity than phase variations, achieving high fidelity.

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Area of Science:

Quantum Information Science
Integrated Photonics
Quantum Computing Hardware

Background:

Scaling linear-optics quantum computing necessitates multi-photon gates with specific performance characteristics.
Compact, phase-stable gates with high quantum interference and ancillary photon detection are crucial for advancement.

Purpose of the Study:

To design, fabricate, and characterize the optimal Knill controlled-Z gate for integrated photonic circuits.
To assess the sensitivity of the gate's performance to fabrication variations, specifically phase and reflectivity.

Main Methods:

Implementation of the Knill controlled-Z gate within integrated laser-written waveguide arrays.
Characterization of device performance, focusing on mode fidelity and process fidelity.
Analysis of sensitivity to variations in circuit phase and coupler reflectivity.

Main Results:

Device performance demonstrated greater sensitivity to coupler reflectivity deviations than to phase variations.
Mode fidelity was found to be less susceptible to reflectivity and phase errors compared to process fidelity.
The best fabricated device achieved a high fidelity of 0.931 ± 0.001 with the ideal unitary circuit.

Conclusions:

The integrated Knill controlled-Z gate shows promise for scalable quantum computing.
Fabrication tolerances, particularly in coupler reflectivity, are critical for optimal gate performance.
The achieved fidelities indicate the viability of this approach for building robust quantum processors.