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Showing 1 to 20 of 34 for “"Quantum Key Distribution (QKD)"”.
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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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DESIGN OF AN OPTICAL GROUND STATION FOR SPACE-BASED QUANTUM KEY DISTRIBUTION
Quantum key distribution (QKD) provides information-theoretic security built on the ‘No Cloning’ Theorem and recent efforts have demonstrated that space-based QKD may be established with acceptable link loss. Meanwhile, on the ground, a network of optical ground station (OGS) is necessary to …
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Soft Processing Techniques for Quantum Key Distribution Applications
… information reconciliation 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 …
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PROTECTING PRIVACY AND SECURING DATABASES WITH QUANTUM NETWORKS
… entry from a database. We 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 …
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Towards MDI QKD using Quantum Dot Single Photon Sources
It is only a matter of time until quantum computers will be capable of breaking all of our current encryption. In the light of this cryptography crisis, it is vital to experimentally realize Quantum Key Distribution (QKD) protocols, which are information-theoretic secure. This form of security, …
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Applications of single-photon two-qubit quantum logic to the quantum information science
… this thesis, I describe demonstration of various quantum information processing tasks using single-photon two-qubit (SPTQ) quantum logic. As an initial state of those tasks, I used various entangled photon pairs, and I describe development of a polarization entangled photon pair source based on a …
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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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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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Towards optical quantum communication in space
"To build a global quantum communication network, low-transmission, fiber-based communication channels can be supplemented by using a free-space channel between a satellite and a ground station on Earth. To this end, we have developed a system that generates hyperentangled photonic ""ququarts'' and …
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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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High performance photon-pair source based on a fiber-coupled periodically poled KTiOPO₄ waveguide
… a bulk crystal. To utilize waveguide sources in quantum information processing (QIP) applications, it is highly desirable to integrate additional functionality such as pump sources and modulators at the waveguide-chip level for compactness, reliability, and ease of operation. As a first step we …
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Ultrafast sources of entangled photons for quantum information processing
Recent advances in quantum information processing (QIP) have enabled practical applications of quantum mechanics in various fields such as cryptography, computation, and metrology. Most of these applications use photons as carriers of quantum information. Therefore, engineering the quantum state of …
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Integrated optical components for quantum key distribution
The security of current public key cryptosystems, such as RSA, depends on the difficulty of computing certain functions known as trapdoor functions. However, as computational resources become more abundant with the fast development of super- and quantum computers, relying on such methods for …
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Improving the Security of Continuous Variable Quantum Random Number Generators
… used to make random decisions required in both quantum key distribution (QKD) and fundamental tests of the foundations of quantum mechanics. For each application the requirements on the random numbers may be different. For some applications, such as computer simulations, it is sufficient for the …
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Bidirectional adaptive optics architectures for optical communication through atmospheric turbulence
… growing demand for 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 …
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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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DEVELOPMENT OF QUANTUM TECHNOLOGIES FOR QUANTUM COMMUNICATION
… Sistema Energetico – RSE S.p.A., investigates quantum communication in critical industrial environments, focusing on the electrical power grid, while also advancing experimental techniques for quantum-state generation and detection in the laboratory. A preliminary survey of Quantum Key …
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Nano-optical studies of superconducting nanowire single-photon detectors
… practical photon-counting applications such as quantum key distribution (QKD), operation of quantum waveguide circuits and quantum emitter characterisation. Major challenges in the development of SNSPDs are the improvement of device uniformity and achieving efficient optical coupling. …
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Single-photon avalanche photodiodes for quantum communication applications in the near-infrared
… such as light detection and ranging (LIDAR) and quantum key distribution (QKD) systems. Within the work, the effect of the lateral dimensions of the detector’s anode on the experimental characteristics that are used to quantify performance of the SPAD in the gated operating mode, namely the dark …
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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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