Browsing Science (Faculty of) by Subject "quantum communication"
Now showing items 1-15 of 15
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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 ... -
Creating and probing laser-cooled atomic ensembles inside a hollow-core optical fibre
(University of Waterloo, 2024-01-26)A laser-cooled atomic ensemble confined inside a hollow-core optical fiber offers a unique platform for enhanced light-matter interactions and their applications. At the same time, transferring a cloud of laser-cooled ... -
Entanglement quantification and quantum benchmarking of optical communication devices
(University of Waterloo, 2012-04-27)In this thesis, we develop a number of operational tests and tools for benchmarking the quantum nature of optical quantum communication devices. Using the laws of quantum physics, ideal quantum devices can fundamentally ... -
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 ... -
Heralding Photonic Qubits for Quantum Communication
(University of Waterloo, 2016-01-22)Quantum communication attempts to harness the unique rules of quantum mechanics to perform communication tasks that are difficult or impossible using classical rules. To realize these benefits, information must be carried ... -
Investigation of Photon Interactions with Semiconductor Quantum Dot Devices for Quantum Communication Applications
(University of Waterloo, 2020-01-21)A major goal in the field of quantum communication is to achieve long-distance (>100 km) transmission of quantum information, which would allow for the formation of a global quantum network. Devices called 'quantum repeaters' ... -
An Operational Road towards Understanding Causal Indefiniteness within Post-Quantum Theories
(University of Waterloo, 2022-01-07)A theory, whatever it does, must correlate data. We commit ourselves to operational methodology, as a means towards studying the space of Generalised Probability Theories that are compatible with Indefinite Causality. Such ... -
Optical Quantum Communication & Cryptography with Temporarily Trusted Parties
(University of Waterloo, 2019-09-19)The work in this thesis can be divided into three parts. The first two parts deal with optical quantum communication protocols and the third part deals with quantum cryptography. The first part of the thesis is a step ... -
Practical Quantum Communication
(University of Waterloo, 2015-10-30)Current communication networks are based on classical physics and classical information-processing. However, for nearly a century, we have known that at its most fundamental level, the universe is governed by the laws of ... -
Quantum reference frames associated with non-compact groups: the case of translations and boosts, and the role of mass
(American Physical Society, 2016-03)Quantum communication without a shared reference frame or the construction of a relational quantum theory requires the notion of a quantum reference frame. We analyze aspects of quantum reference frames associated with ... -
Silicon avalanche photodiodes for satellite based quantum communication
(University of Waterloo, 2018-09-25)Single photons detectors are required for applications like quantum key distribution and testing Bell's inequalities. Silicon avalanche photodiodes (Si APD's) have advantages like low dark count rate. This thesis aims to ... -
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, ... -
Tools for the Security Analysis of Quantum Key Distribution in Infinite Dimensions
(University of Waterloo, 2021-08-12)We develop a method to connect the infinite-dimensional description of optical continuous-variable quantum key distribution (QKD) protocols to a finite-dimensional formulation. The secure key rates of the optical QKD ...