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Assessing the Nonequilibrium Thermodynamics in a
Assessing the Nonequilibrium Thermodynamics in a

... We thus need to find jnðλτ Þi such that jhnðλτ ÞjB̂jiij is maximum and then change our Hamiltonian in a time τ given by Eq. (21). This is a strong condition though, as if it is fulfilled, the state is not changing at all. If, for example, the quenched operator is not limited in the norm instead, the ...
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56 COPYRIGHT 2006 SCIENTIFIC AMERICAN, INC.
56 COPYRIGHT 2006 SCIENTIFIC AMERICAN, INC.

... world lines by swapping the positions of particles. How particles behave when swapped is one of the many ways that quantum physics differs fundamentally from classical physics. In classical physics, if you have two electrons at locations A and B and you interchange their positions, the fi nal state i ...
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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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