Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Quantum Communications"”.
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QUANTUM COMMUNICATIONS IN CONTINUOUS VARIABLE SYSTEMS
Nowadays, quantum communications provide a vast field of research in rapid expansion, with a huge potential impact on the future developments of quantum technologies. In particular, continuous variable systems, employing coherent-state encoding and quadrature measurements, represent a suitable …
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Characterization of measurements in quantum communications.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1974. Ph.D.
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Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
Quantum states can be correlated in ways beyond what is possible for classical states. These correlations are considered as the main resource for quantum computation and communication tasks. In this thesis, I present my studies on the different forms of Quantum Correlations known as "Quantum …
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Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
Quantum states can be correlated in ways beyond what is possible for classical states. These correlations are considered as the main resource for quantum computation and communication tasks. In this thesis, I present my studies on the different forms of Quantum Correlations known as "Quantum …
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Quantum Information Processing with Color Center Qubits: Theory of Initialization and Robust Control
Quantum information technologies include secure quantum communications and ultra precise quantum sensing that are significantly more efficient than their classical counterparts. To enable such technologies, we need a scalable quantum platform in which qubits are con trollable. Color centers provide …
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Quantum key distribution beyond the repeaterless secret key capacity
Quantum communications promise to provide information theoretic security in the exchange of information. However, unlike their classical counterpart, they utilise dim optical pulses whose amplification is prohibited. Consequently, their transmission rate and range is confined below a theoretical …
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Quantum optical state comparison amplification
Quantum signals have intriguing properties and a characteristic feature of them is their intrinsic noise. This results in uncertainty relations restricting our ability to measure conjugate variables with absolute precision simultaneously. In the context of amplification, this noise forbids an …
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Optically Switched Quantum Key Distribution Network
… is vital to modern communication networks. Quantum Key Distribution (QKD) is a promising method based on the quantum properties of light to generate and distribute unconditionally secure keys for use in classical data encryption. Significant progress has been achieved in the performance of …
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Modeling and engineering impact ionization in avalanche photodiodes for near and mid infrared applications
… of 1.55 microns. Moreover, the fast progress on quantum communications requires Geiger-mode APDs to operate at higher repetition rates. Currently, Geiger-mode APDs are limited to operate at detection rates of about 20 MHz. In addition, there has been relatively little work on infrared APDs, …
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Zinc oxide nanophotonics : toward quantum photonic technologies
… are required for a wide range of applications in quantum information science, quantum cryptography, and quantum communications. ZnO has been investigated for classical light emitting applications such as energy efficient light emitting diodes (LEDs) and ultraviolet (UV) lasers. Significantly ZnO …
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A multi-protocol quantum key distribution transmitter
Quantum key distribution (QKD) is a technology that allows two users to communicate with theoretically perfect security using standard optical fibres. This is possible by transmitting the key on single photons, meaning a measurement by an eavesdropper disturbs the system in a way observable to the …
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Excitons in Two-Dimensional Materials: from Many-Body Physics to Quantum Technologies
… of localised excitons, or excitons that are quantum con ned to a particular spatial location, resulting in single-photon emitters (SPE). Here, I explore the deterministic generation of SPEs in ML-WSe₂ and another TMD, ML-WS₂, by using pre-patterned substrates. The attractiveness of TMDs and …
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Photon-Number Resolving by Superconductive Devices
Strong interests on optical quantum based metrology, quantum information and particularly in quantum cryptography are continuously growing. The main limitations to the developments in these fields are due to non-ideal devices: both single photon sources and single photon detectors. In these field …