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 20 of 43 for “"QKD"”.
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Towards MDI QKD using Quantum Dot Single Photon Sources
… experimentally realize Quantum Key Distribution (QKD) protocols, which are information-theoretic secure. This form of security, which has never been possible with classical cryptography protocols, states that the protocol will remain equally secure regardless of the computational power of …
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QKD and high-speed classical data hybrid metropolitan network
Quantum Key Distribution (QKD) is currently receiving much attention as it provides a secure source of encryption keys. Discrete-Variable QKD (DV-QKD) is possible for single photon transmission in QKD to-coexist with and encode classical wavelength division multiplexed (WDM) data with appropriate …
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Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD
In this dissertation I will probe the innate uncertainty of quantum mechanics. After deriving the necessary tools I will tackle Popper's experiment, a long misunderstood thought experiment with recent experimental results. I will then discuss how uncertainty changes when making measurements from …
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Quantum Cryptography: From Theory to Practice
Quantum cryptography or quantum key distribution (QKD) applies fundamental laws of quantum physics to guarantee secure communication. The security of quantum cryptography was proven in the last decade. Many security analyses are based on the assumption that QKD system components are idealized. In …
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Design of New-generation Quantum Key Distribution Systems for Secure Communication
… Among them, the quantum key distribu- tion (QKD) technique guarantees the information-theoretic security of the task of remote secure key distribution. Unlike its classical counterpart, the security of QKD does not rely on the lack of computational power of the current classical computers on …
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DEPLOYED QUANTUM KEY DISTRIBUTION WITH A ROOM-TEMPERATURE TELECOM SINGLE PHOTON SOURCE
Quantum key distribution (QKD) allows distant users to communicate with perfect secrecy based on the principles of quantum physics. Practical QKD in deployed fibers serves as an important part of the future quantum networks. Although Weak Coherent Pulses have achieved impressive key rates as QKD …
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Laboratorní úloha – Kvantová distribuce klíčů založená na polarizaci
… rozbor problematiky kvantové distribuce klíčů (QKD) se zaměřením na jednosměrné prepare-and-measure protokoly s diskrétní proměnnou (DV-QKD) a polarizačním kódováním. Práce se člení na část teoretickou a praktickou. V úvodní teoretické části práce je poskytnut komplexní přehled o polarizaci jako …
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The Security of Self-Differencing Avalanche Photodiodes for Quantum Key Distribution
Quantum key distribution (QKD) allows two users to communicate with information theoretic security by encoding information on single photons. This security is based on the laws of physics and as such can never be broken in theory. However, in practice, components do not always behave according to …
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High-dimensional quantum communication over deployed fiber
Quantum key distribution (QKD) exploits the inherent strangeness of quantum mechanics to improve secure communication, enabling two pre-authenticated participants to establish symmetric encryption keys over long distances, without making any assumptions about the computational abilities of an …
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Optically Switched Quantum Key Distribution Network
… 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 QKD point-to-point …
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Soft Processing Techniques for Quantum Key Distribution Applications
… and data sifting for Quantum Key Distribution (QKD). A novel composite channel model for QKD is identified, which includes both a hard output quantum channel and a soft output classic channel. The Log-Likelihood Ratios, - also called soft-metrics - derived from the two channels are jointly …
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Integrated optical components for quantum key distribution
… becomes risky. Quantum key distribution (QKD), is a potential solution that can allow theoretically secure key exchange for future communications. Chip-scale integration of this solution for securing communication of embedded systems and hand held devices demands miniaturizing the optical …
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High-dimensional entanglement-based quantum key distribution
Conventional quantum key distribution (QKD) uses a discrete two-dimensional Hilbert space for key encoding, such as the polarization state of a single photon. In contrast, high-dimensional QKD allows encoding onto a larger state space, such as multiple levels of a continuous variable of a single …
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Protocols and Resources for New Generation Continuous Variable Quantum Key Distribution
… the development of quantum key distribution (QKD). The majority of the development of QKD is done with discrete variables (DV), i.e. qubits with the underlying system of single photons. This is one interpretation of an optical field. Alternatively an optical field can be interpreted as wave …
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Protocols and Resources for New Generation Continuous Variable Quantum Key Distribution
… the development of quantum key distribution (QKD). The majority of the development of QKD is done with discrete variables (DV), i.e. qubits with the underlying system of single photons. This is one interpretation of an optical field. Alternatively an optical field can be interpreted as wave …
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Photonic Entanglement for a Quantum Repeater
Quantum Key Distribution (QKD) has opened a new avenue for secure communication, by allowing one to distribute a random secret key between two users that are connected through a public channel without revealing information to unauthorized parties. If a message is encrypted with the one time pad (a …
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DEVELOPMENT OF QUANTUM TECHNOLOGIES FOR QUANTUM COMMUNICATION
… preliminary survey of Quantum Key Distribution (QKD) technologies and national power-grid fiber networks has indicated that commercial solutions may work on short fiber links along medium-voltage urban lines, while long-distance communication along high-voltage transmission lines remains …
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Bidirectional adaptive optics architectures for optical communication through atmospheric turbulence
… bandwidth, while FSO quantum key distribution (QKD) links allow information-theoretic rather than computational secure communication between two parties. Unlike fiber-optic classical communication and QKD links, FSO links can do so with minimal up-front investments in infrastructure. Setting …
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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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PROTECTING PRIVACY AND SECURING DATABASES WITH QUANTUM NETWORKS
… propose the use of a quantum key distribution (QKD) network to supply the necessary IT-secure symmetric keys for the first IT-secure implementation of a two-database SPIR. This is demonstrated experimentally on a fingerprint database using a measurement-device-independent (MDI) QKD setup. To …
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