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Corner state of light in photonic waveguides
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2018 (English)In: Article in journal (Refereed) Submitted
Place, publisher, year, edition, pages
2018.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-168044OAI: oai:DiVA.org:su-168044DiVA, id: diva2:1305460
Available from: 2019-04-16 Created: 2019-04-16 Last updated: 2019-04-17Bibliographically approved
In thesis
1. Multiparty Quantum Communication and fs-laser Written Integrated Optics Circuits
Open this publication in new window or tab >>Multiparty Quantum Communication and fs-laser Written Integrated Optics Circuits
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Quantum information science, the rapidly developing interdisciplinary field,  gives power to the information and communications technologies (ICT) by  providing secure communication, precision measurements, ultra-powerful simulation and ultimately computation. It is well known that photons are an ideal candidate for encoding the quantum bit, or "qubit", in quantum information and specially for quantum communication. This thesis consists of two main parts. In the first part, realization of quantum security tasks using optical fibers has been implemented. Bell tests are a cornerstone of quantum key distribution and are necessary for device-independent security. Device-independent Bell inequality test must be performed with care to avoid loopholes. Time-energy entanglement has a distinct advantage over polarization as it is easier transmitted over longer distances, therefore, it may be preferable as a quantum resource to perform reliable key distribution. Novel multi-party communication protocols: secret sharing, detectable Byzantine agreement, clock synchronization, and reduction of communication complexity, all these quantum protocols has been realized without compromising on detection efficiency or generating extremely complex many-particle entangled states. These protocols are realized in an optical fiber setup with sequential phase modulation on single photons. In recent years there has been great interest in fabricating ICT optical setups in low scale in glass chips, which would replace the bulk setups on tables used today. In the second part of the thesis, realization of photonic waveguides in glass has been implemented. Using femtosecond laser inscription of waveguides in glass, photonic quantum technologies and integrated optical circuits are becoming more and more important in miniaturization of optical circuits written in different glass samples for the quantum optics and quantum information processing. These platforms offer stability over the time-scales required for multi-photon coincidence based measurements. The study and optimization the different building blocks for integrated photonic quantum circuits, for instance the directional coupler and Mach-Zehnder interferometer is very important. The principal goal is to develop a method for design, fabrication and characterization of integrated optics circuits for further applications in quantum information. Incorporation of photon sources, detectors, and circuits integrating waveguides technology can be used to produce integrated photonics devices.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2019. p. 103
Keywords
Quantum optics, quantum communication, quantum cryptography, fs-laser written waveguides, integrated optics circuits
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-168031 (URN)978-91-7797-737-7 (ISBN)978-91-7797-738-4 (ISBN)
Public defence
2019-09-16, sal FB42 AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Submitted.

Available from: 2019-08-22 Created: 2019-04-15 Last updated: 2019-09-27Bibliographically approved

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