The Helium Atom - Oxford Academic
... (see, e.g., the old review by Van Vleck 3 >) and of the H2 +-molecule4>retained a pessimistic view concerning a semiclassical treatment of few-body systems with several degrees of freedom. The failure of the old quantum theory is not an intrinsic defect of the theory as conjectured by Born. 5> At le ...
... (see, e.g., the old review by Van Vleck 3 >) and of the H2 +-molecule4>retained a pessimistic view concerning a semiclassical treatment of few-body systems with several degrees of freedom. The failure of the old quantum theory is not an intrinsic defect of the theory as conjectured by Born. 5> At le ...
About John Stachel`s “Structural Realism and Contextual Individuality”
... all, such a predicate as “is one meter from some other point but not from itself” also applies to all points, so does not express a difference between them. Secondly, the deduction, that there are at least two Xs if some X bears an irreflexive relation to some X, does not require the PII! It assumes ...
... all, such a predicate as “is one meter from some other point but not from itself” also applies to all points, so does not express a difference between them. Secondly, the deduction, that there are at least two Xs if some X bears an irreflexive relation to some X, does not require the PII! It assumes ...
Reversible vs. Quantum Computing
... computer exactly when and how to unexceptions, to repair damage caused by compute unwanted information, and viruses or computer break-ins, or as an when to throw it away, so as to make the aid to program debugging. However, best overall use of the machine’s resourthese applications can be implemente ...
... computer exactly when and how to unexceptions, to repair damage caused by compute unwanted information, and viruses or computer break-ins, or as an when to throw it away, so as to make the aid to program debugging. However, best overall use of the machine’s resourthese applications can be implemente ...
Locality and Causality in Hidden Variables Models of Quantum Theory
... local physical laws. And since the quantum mechanical predictions are con rmed by most experiments, see for example [3], one has to conclude that there are nonlocal physical actions in nature. EPR argued by considering a thought experiment with a certain correlated 2-particle state. Bohm transformed ...
... local physical laws. And since the quantum mechanical predictions are con rmed by most experiments, see for example [3], one has to conclude that there are nonlocal physical actions in nature. EPR argued by considering a thought experiment with a certain correlated 2-particle state. Bohm transformed ...
Quantum Annealing with Markov Chain Monte Carlo Simulations
... are being built with capabilities exceeding classical computers. One prominent case is the so-called D-Wave quantum computer, which is a computing hardware device built to implement quantum annealing for solving combinatorial optimization problems. Whether D-Wave computing hardware devices display a ...
... are being built with capabilities exceeding classical computers. One prominent case is the so-called D-Wave quantum computer, which is a computing hardware device built to implement quantum annealing for solving combinatorial optimization problems. Whether D-Wave computing hardware devices display a ...
Thermal noise and correlations in photon detection
... techniques, drawn from both radio and optical astronomy, including coherent and direct detection, as well as single-aperture focal plane array imaging and interferometric aperture synthesis imaging. New variations of these techniques are emerging, such as the combination of interferometry with direc ...
... techniques, drawn from both radio and optical astronomy, including coherent and direct detection, as well as single-aperture focal plane array imaging and interferometric aperture synthesis imaging. New variations of these techniques are emerging, such as the combination of interferometry with direc ...
Comparison of Theory and Experiment for a One
... recent experiment as reported in Ref. [1]. Because of this circumstance, we have carried out theoretical investigations in support of our experimental program, and present comparisons of these model calculations with our measurements in this paper. In Section II we introduce a simplified four-state ...
... recent experiment as reported in Ref. [1]. Because of this circumstance, we have carried out theoretical investigations in support of our experimental program, and present comparisons of these model calculations with our measurements in this paper. In Section II we introduce a simplified four-state ...
Phys. Rev. A 92, 032304
... preprepared multipartite entangled resource states, referred to as cluster states [2–4]. Sufficiently large cluster states are first prepared before being appropriately reshaped for any specific operations. Arbitrary unitary operations are implemented by the precise selection of measurement bases an ...
... preprepared multipartite entangled resource states, referred to as cluster states [2–4]. Sufficiently large cluster states are first prepared before being appropriately reshaped for any specific operations. Arbitrary unitary operations are implemented by the precise selection of measurement bases an ...
Deformed Generalization of the Semiclassical Entropy
... for problems with more than a few degrees of freedom. Another great advantage of the semiclassical approximation lies in that it facilitates an intuitive understanding of the underlying physics, which is usually hidden in blind numerical solutions of the Schrödinger equation. Although semiclassical ...
... for problems with more than a few degrees of freedom. Another great advantage of the semiclassical approximation lies in that it facilitates an intuitive understanding of the underlying physics, which is usually hidden in blind numerical solutions of the Schrödinger equation. Although semiclassical ...
Photo-Ionization of Noble Gases: A Demonstration of Hybrid
... results compared to the RMF results. A contribution to this width is from the finite bandwidth of the laser pulse. In principle, the RMF results are exactly comparable to a result from a time dependent method only in the continuous wave limit. There is also an additional oscillation in the haCC cros ...
... results compared to the RMF results. A contribution to this width is from the finite bandwidth of the laser pulse. In principle, the RMF results are exactly comparable to a result from a time dependent method only in the continuous wave limit. There is also an additional oscillation in the haCC cros ...
Quantum Physics of Nature QuPoN 2015 Book of Abstracts
... barely disturb the system at the cost of providing only little information. An example is the measurement of the direction in which a magnet points: this doesn’t “collapse” the spins that make-up the magnet while providing good enough-but-not-complete information on the magnet direction. This raises ...
... barely disturb the system at the cost of providing only little information. An example is the measurement of the direction in which a magnet points: this doesn’t “collapse” the spins that make-up the magnet while providing good enough-but-not-complete information on the magnet direction. This raises ...
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.