Scientific Report 2015 - 2016 - PCS
... bands and compact localized states under the impact of disorder, external fields, few- and many-body interactions, both on a quantum as well as on a classical (nonlinear) level. Second, we study various aspects of geometric frustration. We study how structural and bond disorder lead to an ordered st ...
... bands and compact localized states under the impact of disorder, external fields, few- and many-body interactions, both on a quantum as well as on a classical (nonlinear) level. Second, we study various aspects of geometric frustration. We study how structural and bond disorder lead to an ordered st ...
J. Phys. Chem. B 106, 8271, 2002
... (e.g., earlier SC-IVR simulations have been only partially successful at reproducing full quantum mechanical results16). It is, therefore, of interest to explore to what extent a more accurate semiclassical method (e.g., the TS SC-IVR of ref 1) is able to describe the photodissociation dynamics of H ...
... (e.g., earlier SC-IVR simulations have been only partially successful at reproducing full quantum mechanical results16). It is, therefore, of interest to explore to what extent a more accurate semiclassical method (e.g., the TS SC-IVR of ref 1) is able to describe the photodissociation dynamics of H ...
Efficient generation of a maximally entangled state by
... In fact, various interesting and peculiar phenomena are predicted on the basis of highly nonclassical states, and entanglement plays a key role in quantum information protocols [1]. They all rely on the generation of nontrivial states and are not realized without establishing strategies for the prep ...
... In fact, various interesting and peculiar phenomena are predicted on the basis of highly nonclassical states, and entanglement plays a key role in quantum information protocols [1]. They all rely on the generation of nontrivial states and are not realized without establishing strategies for the prep ...
NON-HERMITIAN QUANTUM MECHANICS by KATHERINE JONES
... atoms at both red and blue sites. At half-filling effectively there is a spin-half at each site; these spins are anti-ferromagnetically coupled. In the doped compound some fraction of the sites are occupied by holes. 92 ...
... atoms at both red and blue sites. At half-filling effectively there is a spin-half at each site; these spins are anti-ferromagnetically coupled. In the doped compound some fraction of the sites are occupied by holes. 92 ...
Review - Sociedade Brasileira de Química
... the quantum NL S model, equation (3), changes its properties dramatically since the critical dynamical exponent assumes z = 2 (nonrelativistic feature), in contrast with the value z = 1 found in the relativistic quantum NL S model, associated with the 2d-quantum AF Heisenberg Hamiltonian. In fact, e ...
... the quantum NL S model, equation (3), changes its properties dramatically since the critical dynamical exponent assumes z = 2 (nonrelativistic feature), in contrast with the value z = 1 found in the relativistic quantum NL S model, associated with the 2d-quantum AF Heisenberg Hamiltonian. In fact, e ...
Introduction to ”Topological Geometrodynamics: an Overview
... 5. A further objection is that classical weak fields identified as induced gauge fields are long ranged and should cause large parity breaking effects due to weak interactions. These effects are indeed observed but only in living matter. A possible resolution of problem is implied by the condition t ...
... 5. A further objection is that classical weak fields identified as induced gauge fields are long ranged and should cause large parity breaking effects due to weak interactions. These effects are indeed observed but only in living matter. A possible resolution of problem is implied by the condition t ...
Aspects of quantum information theory
... computers”, capable of handling otherwise untractable problems, has excited not only researchers from many different fields like physicists, mathematicians and computer scientists, but also a large public audience. On a practical level all these new visions are based on the ability to control the qu ...
... computers”, capable of handling otherwise untractable problems, has excited not only researchers from many different fields like physicists, mathematicians and computer scientists, but also a large public audience. On a practical level all these new visions are based on the ability to control the qu ...
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.