Browsing Science (Faculty of) by Subject "quantum key distribution"
Now showing items 1-17 of 17
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Advancing the robustness of polarization and time bin quantum key distribution for free-space channels
(University of Waterloo, 2023-05-15)Quantum networks are an emerging technology that aims to harness the power of quantum mechanics to revolutionize communication and computation. Many countries are establishing national quantum networks to modernizing their ... -
Assessing the Practicality of a Simple Multi-node Quantum Repeater
(University of Waterloo, 2017-10-25)This thesis assesses the theoretical performance of a realistic multi-node quantum repeater that is implementable with current technology. A quantum repeater, by definition, allows for communication rates in a channel to ... -
Decoy-State Quantum Key Distribution with Arbitrary Phase Mixtures and Phase Correlations
(University of Waterloo, 2022-01-26)We formulate a general method to find bounds on the statistics of states passing through an unknown channel from the statistics of another set of states. We pay special attention to the application of this method to ... -
Experimental and theoretical demonstration of the feasibility of global quantum cryptography using satellites
(University of Waterloo, 2014-10-15)Information security is a growing concern in our modern world, where almost everything can be done online. To protect security, classical encryption protocols, such as RSA, are used. These encryption protocols are almost ... -
Experimental quantum communication in demanding regimes
(University of Waterloo, 2011-08-02)Quantum communication promises to outperform its classical counterparts and enable protocols previously impossible. Specifically, quantum key distribution (QKD) allows a cryptographic key to be shared between distant parties ... -
Improved Keyrates for Quantum Key Distribution from two-way Classical Communication
(University of Waterloo, 2022-09-22)Quantum Key Distribution (QKD) promises information-theoretic security of secret keys. An important metric for QKD protocols is the asymptotic keyrate. We propose and analyze several new classical processing protocols for ... -
Investigations of InAsP/InP Semiconductor Devices for Quantum Communication Technologies
(University of Waterloo, 2015-01-19)This thesis presents a set of magnetotransport experiments which explore the advantages of InAsP/InP quantum well material and quantum dot structures for spin/photon devices, with a view towards quantum communication. The ... -
Numerical Finite Key Analysis
(University of Waterloo, 2020-09-02)In this thesis, we begin by both expounding and improving the theory of finite key analysis. Our improvement of the analysis in turn improves the amount of key that can be generated for protocols without nice symmetries. ... -
On Free Space Quantum Key Distribution and its Implementation with a Polarization-Entangled Parametric Down Conversion Source
(University of Waterloo, 2007-05-16)This thesis describes the deployment of a free-space quantum key distribution system across the University of Waterloo campus. The quantum key distribution system has the ability to provide unconditionally secure ... -
Pre-Privacy Amplification: A Post-Processing Technique for Quantum Key Distribution with Application to the Simplified Trusted Relay
(University of Waterloo, 2023-04-26)Until quantum repeaters and quantum error correcting codes can be made commercially viable, long distance quantum key distribution (QKD) will continue to rely on trusted relay satellites. Strongly constrained by weight ... -
Security Analysis of Quantum Key Distribution: Methods and Applications
(University of Waterloo, 2021-09-27)Quantum key distribution (QKD) can be proved to be secure by laws of quantum mechanics. In this thesis, we review security proof methods in Renner's framework and discuss numerical methods to calculate asymptotic and finite ... -
Security proof methods for quantum key distribution protocols
(University of Waterloo, 2013-04-26)In this thesis we develop practical tools for quantum key distribution (QKD) security proofs. We apply the tools to provide security proofs for several protocols, ranging from discrete variable protocols in high dimensions, ... -
Security Proofs for Quantum Key Distribution Protocols by Numerical Approaches
(University of Waterloo, 2017-10-25)This thesis applies numerical methods to analyze the security of quantum key distribution (QKD) protocols. The main theoretical problem in QKD security proofs is to calculate the secret key generation rate. Under certain ... -
Squashing Models for Optical Measurements in Quantum Communication
(University of Waterloo, 2009-10-02)Many protocols and experiments in quantum information science are described in terms of simple measurements on qubits. However, in an experimental implementation, the exact description of the measurement is usually more ... -
Techniques for Improving Numerical Secret Key Rates of Quantum Key Distribution Protocols
(University of Waterloo, 2023-10-24)Quantum Key Distribution (QKD) is a method for producing secure keys between two parties whose security does not rely on computational assumptions potentially breakable by quantum computers. However, physical constraints, ... -
Toward standardization of Quantum Key Distribution
(University of Waterloo, 2020-09-03)Information security becomes an inseparable part of our everyday life. An encryption method widely used today is public-key encryption. The security of this method is based on a hard to solve mathematical problems against ... -
Understanding Polarization Distortions for Real-world Quantum Key Distribution
(University of Waterloo, 2020-05-15)The field of quantum key distribution (QKD) has seen many advancements since its conception in 1984. Recently there have been developments towards establishing free space optical links between satellites and earth to enable ...