demartini
... IN SUMMARY: our results suggest that: .1) The methods of the classical Differential Geometry may be considered as an inspiring context in which the relevant paradigms of modern physics can be investigated satisfactorily by a direct , logical, (likely) “complete” theoretical approach. .2) Quantum Me ...
... IN SUMMARY: our results suggest that: .1) The methods of the classical Differential Geometry may be considered as an inspiring context in which the relevant paradigms of modern physics can be investigated satisfactorily by a direct , logical, (likely) “complete” theoretical approach. .2) Quantum Me ...
Electronic Structure of Strained GaSb/GaAs Quantum Dot
... quantum dots. There are three empirical models, the k.p approximation [9], the pseudopotential model [10] and the tight-binding model [11], [12]. The k.p approximation treats a quantum dot as a confined bulk and continuum system, while the pseudopotential and tight-binding models treat the system wi ...
... quantum dots. There are three empirical models, the k.p approximation [9], the pseudopotential model [10] and the tight-binding model [11], [12]. The k.p approximation treats a quantum dot as a confined bulk and continuum system, while the pseudopotential and tight-binding models treat the system wi ...
(4)
... Here the operator S specifies the rule that must be used to evaluate the exponential operators in the second equality in Eq. 共28兲. Appendix A gives the details of the rules that must be followed in order for the formal solution involving the ឈ ⌳ and right H ជ ⌳ operators to be exponentials of the le ...
... Here the operator S specifies the rule that must be used to evaluate the exponential operators in the second equality in Eq. 共28兲. Appendix A gives the details of the rules that must be followed in order for the formal solution involving the ឈ ⌳ and right H ជ ⌳ operators to be exponentials of the le ...
Quantum walk based search algorithms
... paper [7], used quantum walks on the Johnson graphs to settle the query complexity of the Element Distinctness problems. Inspired by the work of Ambainis, Szegedy [35] designed a general method to quantize classical Markov chains, and developed a theory of quantum walk based search algorithms. A si ...
... paper [7], used quantum walks on the Johnson graphs to settle the query complexity of the Element Distinctness problems. Inspired by the work of Ambainis, Szegedy [35] designed a general method to quantize classical Markov chains, and developed a theory of quantum walk based search algorithms. A si ...
Measurement Theories in Quantum Mechanics Cortland M. Setlow March 3, 2006
... However, the behavior of equipment in laboratories seems at odds with linear time evolution. When quantum mechanics was being formulated, an ad hoc proposal was introduced to describe the action of a measurement apparatus 1 . This proposal, often called the "collapse postulate," states that a measur ...
... However, the behavior of equipment in laboratories seems at odds with linear time evolution. When quantum mechanics was being formulated, an ad hoc proposal was introduced to describe the action of a measurement apparatus 1 . This proposal, often called the "collapse postulate," states that a measur ...
Quantum and Classical Query Complexities of Local Search are
... is a finite set and S ⊆ Σ[n] for some finite set Σ. The input is a function f ∈ S, hidden by an oracle, such that f (x), where x ∈ [n], can be accessed via a query parameterized by x. The output is some t ∈ T such that (f, t) ∈ R. A special case is the functional oracle problem when the relation is ...
... is a finite set and S ⊆ Σ[n] for some finite set Σ. The input is a function f ∈ S, hidden by an oracle, such that f (x), where x ∈ [n], can be accessed via a query parameterized by x. The output is some t ∈ T such that (f, t) ∈ R. A special case is the functional oracle problem when the relation is ...
The Analytical Study of Electronic and Optical Properties of Pyramid
... stress potential is impossible at this time. Then, one should to restrict oneself by consideration of a one side of the problem, however the strain induced distortions of electron potential energy usually can be accounted in the frame of perturbation theory. As a result, in this work one did not tak ...
... stress potential is impossible at this time. Then, one should to restrict oneself by consideration of a one side of the problem, however the strain induced distortions of electron potential energy usually can be accounted in the frame of perturbation theory. As a result, in this work one did not tak ...
Quantum Potential - Fondation Louis de Broglie
... purpose to develop the so-called Bohmian interpretation was to prove that the von Newmann’s argument about the impossibility of describing the current quantum mechanics on the basis of ’Hidden variables’ is wrong. He realized that by supposing a strictly well-defined localized particle with a well-d ...
... purpose to develop the so-called Bohmian interpretation was to prove that the von Newmann’s argument about the impossibility of describing the current quantum mechanics on the basis of ’Hidden variables’ is wrong. He realized that by supposing a strictly well-defined localized particle with a well-d ...
The Berry-Tabor conjecture
... Eskin, Margulis and Mozes [10] recently strengthened Sarnak’s result by giving explicit diophantine conditions on (α, β, γ) under which the Berry-Tabor conjecture holds. Admissible forms are for example m2 + γn2 ...
... Eskin, Margulis and Mozes [10] recently strengthened Sarnak’s result by giving explicit diophantine conditions on (α, β, γ) under which the Berry-Tabor conjecture holds. Admissible forms are for example m2 + γn2 ...
Spirituality of the Evolving cosmos
... The remarkable thing about the WMAP pictures is that they confirm a story of the early universe which previously might have been seen as a rather wild extrapolation back in time of conventional physics. This slightly old slide depicts the main features. While the period before the inflationary epoch ...
... The remarkable thing about the WMAP pictures is that they confirm a story of the early universe which previously might have been seen as a rather wild extrapolation back in time of conventional physics. This slightly old slide depicts the main features. While the period before the inflationary epoch ...
The Classical Universes of the No-Boundary Quantum State
... S(q0) might arise from a semiclassical approximation to a path integral for Ψ(q0) but it doesn’t have to. ...
... S(q0) might arise from a semiclassical approximation to a path integral for Ψ(q0) but it doesn’t have to. ...
Quantum Statistics - Ole Witt
... Being the (classical) equation of state for ideal gasses. The derivation of (4.5), (4.7) and (4.9) relies on the assumption that all the masses of the particles are different, that they do not interact, and also that: ...
... Being the (classical) equation of state for ideal gasses. The derivation of (4.5), (4.7) and (4.9) relies on the assumption that all the masses of the particles are different, that they do not interact, and also that: ...
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.