Breaking the restrictions of nearest neighbour interactions in mass-manufacturable silicon photonics: applications in quantum information systems

Hope, A 2016, Breaking the restrictions of nearest neighbour interactions in mass-manufacturable silicon photonics: applications in quantum information systems, Doctor of Philosophy (PhD), Electrical and Computer Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Breaking the restrictions of nearest neighbour interactions in mass-manufacturable silicon photonics: applications in quantum information systems
Author(s) Hope, A
Year 2016
Abstract This doctoral thesis presents a scalable mass-manufacturable waveguide platform that can make use of an optical bus to provide an on-chip long-range communication channel.
This optical bus is combined with an adiabatic transfer technique to provide robust and highly coherent transfer between waveguides. The potential for this robust transfer is explored in the context of sensitive quantum information processing and the designs for several important quantum gates are introduced. The addition of the optical bus allows multi-dimensional coupling that is not possible within current planar waveguide platforms.

Shallow ridge waveguides are fabricated using a standard silicon photonics platform. The propagation loss due to the lateral leakage was characterised over a range of waveguide widths and operating wavelengths. Losses as low as 0.087 dB/mm can be achieved by considering the lateral leakage effect during waveguide design.

A new approach to long-range coupling is described that combines the lateral leakage effect observed in shallow ridge waveguides with an adiabatic transfer technique. This platform enables the transport of light between two waveguides over surprising distances using radiation within the silicon slab as an optical bus. Due to the nature of the adiabatic protocol, the bus is minimally excited and the transport is highly robust. The ability of the bus is further demonstrated by introducing an intermediate waveguide between the pair that can be isolated and completely bypassed from the interaction.

The adiabatic optical bus is then extended to quantum information applications that can perform operations on photonic qubits. Several important gate designs are described that can produce a Hadamard, 50:50 and 1/3:2/3 beam splitter and a non-deterministic controlled NOT gate, with calculations showing one and two-photon gate operation. This is the first adiabatic gate demonstration that required a quantum description for photons.

In summary, this thesis introduces an optical bus that is suitable for fabrication in mass-manufacturable silicon integrated photonic waveguides. The application of an adiabatic protocol ensures the robust transfer of information using this bus. The high fidelity transport can be exploited for the development of integrated photonic quantum gates.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Electrical and Computer Engineering
Subjects Photonics and Electro-Optical Engineering (excl. Communications)
Quantum Optics
Keyword(s) Photonics
Quantum optics
Waveguides
Mass-fabrication
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Created: Tue, 19 Apr 2016, 13:41:31 EST by Keely Chapman
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