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UV-written waveguide circuits for integrated quantum optics

UV-written waveguide circuits for integrated quantum optics
UV-written waveguide circuits for integrated quantum optics
Direct UV-written silica-on-silicon provides an attractive platform for quantum optics, offering the key benefits of low propagation losses and excellent optical fibre compatibility. This work has aimed to develop the necessary techniques and components for completely integrated quantum optics experiments to be carried out using this platform, on a larger scale than previously possible. Arrays of matched on-chip photon sources based on birefringence-matched spontaneous four-wave mixing (FWM) are demonstrated, both at 800 nm and in the telecommunications C-band, along with progress towards further integration of these sources. Thermo-optic phase shifters, for use in room temperature quantum circuits, have been optimised via modelling, and a range of alternative modulator technologies have been explored. Further work has been concerned with the development of a modular system for quantum optics, comprising a set of duplicate reconfigurable modules and the necessary drive electronics and software, with the intent of simplifying the task of identifying and quantifying manufacturing imperfections in large integrated experiments. Efforts have also been made to improve the detection efficiency of on-chip transition edge sensor (TES) single photon detectors, including the use of longer absorbers and high reflectors for multiple absorption passes; this has resulted in the demonstration of a photon-number-resolving detector with a Bragg grating enhanced quantum efficiency of 87%. Approaches for further increasing the detection efficiency are considered and a device for on-chip Hong-Ou-Mandel and photon subtraction experiments using these detectors is reported.
University of Southampton
Mennea, Paolo L.
cbd1947e-b285-4f3e-ba7c-007c8b9ce83a
Mennea, Paolo L.
cbd1947e-b285-4f3e-ba7c-007c8b9ce83a
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6

Mennea, Paolo L. (2018) UV-written waveguide circuits for integrated quantum optics. University of Southampton, Doctoral Thesis, 162pp.

Record type: Thesis (Doctoral)

Abstract

Direct UV-written silica-on-silicon provides an attractive platform for quantum optics, offering the key benefits of low propagation losses and excellent optical fibre compatibility. This work has aimed to develop the necessary techniques and components for completely integrated quantum optics experiments to be carried out using this platform, on a larger scale than previously possible. Arrays of matched on-chip photon sources based on birefringence-matched spontaneous four-wave mixing (FWM) are demonstrated, both at 800 nm and in the telecommunications C-band, along with progress towards further integration of these sources. Thermo-optic phase shifters, for use in room temperature quantum circuits, have been optimised via modelling, and a range of alternative modulator technologies have been explored. Further work has been concerned with the development of a modular system for quantum optics, comprising a set of duplicate reconfigurable modules and the necessary drive electronics and software, with the intent of simplifying the task of identifying and quantifying manufacturing imperfections in large integrated experiments. Efforts have also been made to improve the detection efficiency of on-chip transition edge sensor (TES) single photon detectors, including the use of longer absorbers and high reflectors for multiple absorption passes; this has resulted in the demonstration of a photon-number-resolving detector with a Bragg grating enhanced quantum efficiency of 87%. Approaches for further increasing the detection efficiency are considered and a device for on-chip Hong-Ou-Mandel and photon subtraction experiments using these detectors is reported.

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UV-written Waveguide Circuits for Integrated Quantum Optics - Version of Record
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Published date: March 2018

Identifiers

Local EPrints ID: 438086
URI: http://eprints.soton.ac.uk/id/eprint/438086
PURE UUID: 796f6da8-7e7a-4239-9149-b03d9643ed7b
ORCID for Paolo L. Mennea: ORCID iD orcid.org/0000-0002-1740-5333
ORCID for Peter G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X

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Date deposited: 28 Feb 2020 17:30
Last modified: 21 Jul 2020 00:25

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