Browsing Science (Faculty of) by Subject "quantum optics"
Now showing items 1-16 of 16
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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 ... -
Causal Discovery of Photonic Bell Experiments
(University of Waterloo, 2020-01-13)A causal understanding of a physical theory is vital. They provide profound insights into the implications of the theory and contain the information required to manipulate, not only predict, our surroundings. Unfortunately, ... -
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 ... -
Experiments with Generalized Quantum Measurements and Entangled Photon Pairs
(University of Waterloo, 2009-11-02)This thesis describes a linear-optical device for performing generalized quantum measurements on quantum bits (qubits) encoded in photon polarization, the implementation of said device, and its use in two diff erent but ... -
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 ... -
Implementing quantum gates and channels using linear optics
(University of Waterloo, 2012-09-28)This thesis deals with the implementation of quantum channels using linear optics. We begin with overviews of some important concepts in both quantum information and quantum optics. First, we discuss the quantum bit and ... -
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 ... -
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 ... -
PPLN-based photon pair sources toward biphoton quantum frequency conversion
(University of Waterloo, 2018-08-03)While quantum properties of light promise much-needed enhancements to metrology, further development of quantum light sources and associated tools are needed to readily harness two-photon interactions via energy-time ... -
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 tests of causal structures and non-orthogonal states
(University of Waterloo, 2014-06-13)This thesis details two experimental tests that can be applied to particular quantum states to reveal important information. We begin by discussing the relevant background in quantum information. We introduce qubits and ... -
Single photon measurements: from spin-orbit lattices to ultrafast pulses
(University of Waterloo, 2021-09-13)Single photons are naturally suited to quantum information processes as they can carry entanglement in multiple degrees of freedom and maintain coherence easily. In order to fully harness single photons for this use, it ... -
Tunable Coupler in Superconducting Circuits and Impedance Engineering for Josephson Parametric Amplifier
(University of Waterloo, 2020-09-04)In this thesis, we study two topics on superconducting circuits. The first topic is the tunable coupler for resonators. This coupler is implemented with a superconducting circuit coupling with resonators in the dispersive ... -
Ultrafast coincidence characteristics of entangled photons towards entangled two-photon absorption
(University of Waterloo, 2014-01-28)Nonlinear optics has had extensive application into a vast array of scientific fields. One such nonlinear process, two-photon absorption (TPA), has had a wildly successful adoption into the field of biological imaging and ... -
An Ultrafast Source of Polarization Entangled Photon Pairs based on a Sagnac Interferometer
(University of Waterloo, 2009-01-26)This thesis describes the design, development, and implementation of a pulsed source of polarization-entangled photons using spontaneous parametric down-conversion in a Sagnac interferometer. A tangle of 0.9286 ± 0.0015, ... -
The Unruh-DeWitt Detector Model: Modified Dispersion and Nonlinear Couplings
(University of Waterloo, 2021-09-30)In this work, we employ the Unruh-DeWitt (UDW) detector model to various ends. We present applications of this relativistic detector model to quantum optics, including decoherence in optical cavities and non-linear quantum ...