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Public information security in a post-quantum world
Public information security in a post-quantum world

... We find the per iod P in Step 2, and then we just continue with the rest of the algor ithm: Step 3: If / Then If per iod P is odd, go back to Step 1; Else, continue ...
PH5015 - Applications of Quantum Physics
PH5015 - Applications of Quantum Physics

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... theoretical models and in emerging experimental settings. The goal of this interdisciplinary school is to foster interaction between these communities. The school is aimed at PhD students and Postdocs who work in classical networks, quantum physics, quantum communication and quantum information; ...
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... Skill Assessment Sheet Modern Atomic Theory (Quantum Mechanics) 1- Below Basic: 2- Basic: 3- Proficient: 4- Advanced: ...
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... effects of interactions on the condensation of a dilute trapped atomic gas. First, we experimentally scrutinised the concept of purely statistical saturation of the thermal component as the driving mechanism for condensation [1]. We show that under usual experimental conditions ultracold atomic gase ...
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Jort Bergfeld : Completeness for a quantum hybrid logic.
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SCHRÖDINGER EQUATION FOR A PARTICLE ON A CURVED SPACE AND SUPERINTEGRABILITY
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... Abstract. A formulation of quantum mechanics on spaces of constant curvature is studied by quantizing the Noether momenta and using these to form the quantum Hamiltonian. This approach gives the opportunity of studying a superintegrable quantum system. It is shown there are three different ways of o ...
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A quantum point contact for ultra cold Fermions
A quantum point contact for ultra cold Fermions

... Fermi gas of atoms [1]. We employ ultra-high resolution lithography to shape light potentials that realize either a quantum point contact or a quantum wire for atoms. These constrictions are imprinted on a quasi two-dimensional ballistic channel connecting two adjustable reservoirs of quantum degene ...
Materials Computation Center R.M. Martin and J.P. Leburton
Materials Computation Center R.M. Martin and J.P. Leburton

... design parameters that influence the exchange interaction between conduction electrons in realistic double QDs. For this purpose, we use a combined approach based on density functional theory (DFT) to model the QD potential, and diffusion quantum Monte Carlo to simulate accurately exchange and corre ...
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in-class worksheet

报告海报 - 中国科学院武汉物理与数学研究所
报告海报 - 中国科学院武汉物理与数学研究所

... 中组部首批青年拔尖人才(2012) 国家自然科学基金优秀青年基金(2012) 浙江省千人计划(2011) 教育部新世纪人才计划 (2011) ...
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Cryptography Overview PPT - University of Hertfordshire
Cryptography Overview PPT - University of Hertfordshire

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Quantum key distribution



Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.
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