Theory and applications of light-matter interactions in Gerasimos Angelatos
... semiconductor transistor to control electronic signals. For instance, quantum cryptography allows for completely secure communication guaranteed by the laws of quantum mechanics. The quintessential quantum cryptography scheme is the BB84 protocol, where quantum bits are encoded in the polarization o ...
... semiconductor transistor to control electronic signals. For instance, quantum cryptography allows for completely secure communication guaranteed by the laws of quantum mechanics. The quintessential quantum cryptography scheme is the BB84 protocol, where quantum bits are encoded in the polarization o ...
Dynamics and interference of autoionizing wave packets
... pulse wave packets that have one less closed channel scattering in their past. Figures 2共a兲 and 2共b兲 differ only by a slight shift of , while 共a兲 and 共c兲 differ only by dipole amplitudes that are artificially changed for 共c兲. If the two laser pulses were incoherent the flux of 共a兲 and 共b兲 should b ...
... pulse wave packets that have one less closed channel scattering in their past. Figures 2共a兲 and 2共b兲 differ only by a slight shift of , while 共a兲 and 共c兲 differ only by dipole amplitudes that are artificially changed for 共c兲. If the two laser pulses were incoherent the flux of 共a兲 and 共b兲 should b ...
Non-Abelian Anyons and Topological Quantum Computation
... is anti-symmetric. One cannot overemphasize, of course, the importance of the symmetry of the wavefunction, which is the root of the Pauli principle, superfluidity, the metallic state, Bose-Einstein condensation, and a long list of other phenomena. The limitation to one of two possible types of quan ...
... is anti-symmetric. One cannot overemphasize, of course, the importance of the symmetry of the wavefunction, which is the root of the Pauli principle, superfluidity, the metallic state, Bose-Einstein condensation, and a long list of other phenomena. The limitation to one of two possible types of quan ...
Quantum many-particle electron transport in time-dependent systems with Bohmian trajectories by Alfonso Alarc´
... Schematic representation of the I-V curve of a typical RTD. The resonant energy inside the quantum well acts like an energetic filter that lets the electrons from the source to arrive at the drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RTD Current-voltage characte ...
... Schematic representation of the I-V curve of a typical RTD. The resonant energy inside the quantum well acts like an energetic filter that lets the electrons from the source to arrive at the drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RTD Current-voltage characte ...
Modeling quantum fluid dynamics at nonzero temperatures
... relationship between the small parameters δ and e determines the distinction between collisionless ðe2 δ e 1Þ and collision-dominating regimes ðδ e4 1Þ. In the collisionless regime the Vlasov wave equation emerges, describing the evolution of Bogoliubov quasiparticles. The collision integr ...
... relationship between the small parameters δ and e determines the distinction between collisionless ðe2 δ e 1Þ and collision-dominating regimes ðδ e4 1Þ. In the collisionless regime the Vlasov wave equation emerges, describing the evolution of Bogoliubov quasiparticles. The collision integr ...
Quantum numbers and Angular Momentum Algebra Quantum
... |(pq)Mi = ap† aq† |Φ0 i, where |Φ0 i is a chosen reference state, say for example the Slater determinant which approximates 16 O with the 0s and the 0p shells being filled, and M = mp + mq . Recall that we label single-particle states above the Fermi level as abcd . . . and states below the Fermi le ...
... |(pq)Mi = ap† aq† |Φ0 i, where |Φ0 i is a chosen reference state, say for example the Slater determinant which approximates 16 O with the 0s and the 0p shells being filled, and M = mp + mq . Recall that we label single-particle states above the Fermi level as abcd . . . and states below the Fermi le ...
Carotene in Different Solvents.
... possibility is, of course, to explicitly include the solvent molecules in the supermolecular QM calculations. Our S-MC/QM procedure allows this to be done in a natural way 27, 28, 29]. In this connection it is very important to note that it is possible to include dispersive interaction in transition ...
... possibility is, of course, to explicitly include the solvent molecules in the supermolecular QM calculations. Our S-MC/QM procedure allows this to be done in a natural way 27, 28, 29]. In this connection it is very important to note that it is possible to include dispersive interaction in transition ...
Twenty years of the Weyl anomaly
... This was the road to Damascus for Steve as far as Weyl anomalies were concerned an4 like many a recent convert, he went on to become their most ardent advocatet. This was also the beginning of a very fruitful collaboration between the two of us. The significance of my paper with Deser and Isham was ...
... This was the road to Damascus for Steve as far as Weyl anomalies were concerned an4 like many a recent convert, he went on to become their most ardent advocatet. This was also the beginning of a very fruitful collaboration between the two of us. The significance of my paper with Deser and Isham was ...
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.