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Theoretical examination of quantum coherence in a photosynthetic
Theoretical examination of quantum coherence in a photosynthetic

... which can be specified by magnitude of reorganization energy, the electronic coupling can be treated perturbatively. This treatment yields Förster theory (23), which describes incoherent hopping between pigments. In the opposite limit, when the reorganization energies are small, it is possible to tr ...
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... lead to phenomena such as spontaneous demagnetization of spinor Bose gases [18]. In contrast, electric dipoles have parity and time-reversal selection rules which would appear to preclude a dipole-coupled resonance such as is shown in Fig. 1(b). A key finding of this work is that resonances like Fig ...
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... his contemporaries (especially in Europe) took philosophical exception,4 and concerning his use of which Newton himself appears to have been defensively apologetic: he insisted that he “did not philosophize,” was content simply to calculate. . . when the pertinence of his calculations was beyond dis ...
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A QED-Based Wave Theory of Light, Electrons
A QED-Based Wave Theory of Light, Electrons

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... of radiation fields required for quantum gate implementation is strongly correlated with the number of ions used [17–19]. This constitutes a substantial challenge in the construction of a large-scale quantum computer, which may require the manipulation of millions or billions of ions. We will now ou ...
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... theorem (Callen and Welton, 1951), a generalization of the Einstein relation in diffusion. In this very successful approach we have characterized the distribution of the observable Q close to thermal equilibrium by its two-point correlation function alone. This is a manifestation of the fact that it ...
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... intensity of the optical field. This quantum mechanical approach is almost identical to the classical approach, except for the fact that the polarizability can be calculated from the material Hamiltonian. In comparison with the complete adiabatic elimination approach that we will discuss, this appro ...
University of Birmingham A New Optical Gain Model for Quantum
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... curve is dependent on the wavelength, carrier density and carrier temperature. The passive RLC filter shown in Fig.1(a) is commonly used to model the symmetric frequencydependent gain curve [2]. The TLM model of this passive filter is shown in Fig.1(b) which consists of link and stub lines. In the T ...
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... or by their spins. The importance of this difference between particles can of course not be overstated. It is at the root of the Pauli exclusion principle and Bose-Einstein condensation, and determines whether macroscopic numbers of particles obey FermiDirac or Bose-Einstein statistics. According to ...
Copyright cG 2017 by Robert G. Littlejohn Physics 221B Spring
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... The Green’s functions and operators that we will deal with come in two varieties, the timedependent and the energy-dependent (or time-independent). Time-dependent Green’s functions are closely related to the propagator that we studied in Notes 9. They are useful for solving timedependent problems, s ...
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slides - University of Toronto Physics

... Spin is also conserved. We will need to deal with this as well. We will deal with conservation of spin (or more generally, conservation of angular momentum) for the remainder of this lecture and the next. The tools we develop during this discussion will be useful for other things as well. ...
Chapter 3. Foundations of Quantum Theory II
Chapter 3. Foundations of Quantum Theory II

... extra which is used to achieve a desired goal.) The coupling establishes a correlation between the eigenstates of the observable and the distinguishable states of the pointer, so that we can prepare an eigenstate of the observable by “observing” the pointer. This may not seem like a fully satisfying ...
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Canonical quantization

In physics, canonical quantization is a procedure for quantizing a classical theory, while attempting to preserve the formal structure, such as symmetries, of the classical theory, to the greatest extent possible.Historically, this was not quite Werner Heisenberg's route to obtaining quantum mechanics, but Paul Dirac introduced it in his 1926 doctoral thesis, the ""method of classical analogy"" for quantization, and detailed it in his classic text. The word canonical arises from the Hamiltonian approach to classical mechanics, in which a system's dynamics is generated via canonical Poisson brackets, a structure which is only partially preserved in canonical quantization.This method was further used in the context of quantum field theory by Paul Dirac, in his construction of quantum electrodynamics. In the field theory context, it is also called second quantization, in contrast to the semi-classical first quantization for single particles.
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