Results 211 to 220 of about 11,647 (256)
Some of the next articles are maybe not open access.
2018
In general, the process that we use to prepare a system of atoms, molecules or whatever we want for a measurement produces many copies, but not all in the same quantum state. A pure state in which all the molecules, say, are in the same state, is a limiting case. In general, the system will be in a mixed state.
Leo P. Kadanoff, Gordon Baym
+4 more sources
In general, the process that we use to prepare a system of atoms, molecules or whatever we want for a measurement produces many copies, but not all in the same quantum state. A pure state in which all the molecules, say, are in the same state, is a limiting case. In general, the system will be in a mixed state.
Leo P. Kadanoff, Gordon Baym
+4 more sources
Statistical Mechanics and Quantum Mechanics
Nature, 1971Part of the acceptance speech on the occasion of the award of the Lorentz Medal by the Royal Netherlands Academy of Sciences on June 27, 1970.
openaire +1 more source
Perturbation of Statistical Semigroups in Quantum Statistical Mechanics
Journal of Mathematical Physics, 1971The perturbation theory of Hille and Phillips for semigroups of bounded linear operators on a Banach space is modified to apply to the semigroups of positive traceclass operators encountered in quantum statistical mechanics.
openaire +2 more sources
A statistical generalization of the quantum mechanics
Il Nuovo Cimento, 1953It is shown that the ordinary Schrodinger equation for a dynamical system gs may be replaced by a more general equation, which has the form of the Schrodinger equation of a quantized Bose field whose quanta are the systems gs. The linear wave functionals of the quantized field describe pure states of the system gs and the non linear wave functionals ...
openaire +2 more sources
2001
Abstract NMR is not performed on a single or a small number of spins, but on a very large number, comparable with the Avogadro number. Even when one is interested in a molecular species with relatively few spins, the sample contains a large number of molecules of that species, all of which are observed simultaneously.
openaire +1 more source
Abstract NMR is not performed on a single or a small number of spins, but on a very large number, comparable with the Avogadro number. Even when one is interested in a molecular species with relatively few spins, the sample contains a large number of molecules of that species, all of which are observed simultaneously.
openaire +1 more source
Quantum Mechanics and Statistics
1968In the previous chapters it was stated that the entropy of a system can be determined by statistical means by counting the number of micro-states in which the system may occur under the given conditions. By failing to enlarge upon this point, we have falsely given the impression that the way in which the count should be made was definitely established.
openaire +1 more source
2013
Before proceeding to the full quantum field-theoretic description of the macroscopic phenomena introduced in the previous chapter, we should first review the corresponding quantum-mechanical approach—quantum statistical mechanics.
openaire +1 more source
Before proceeding to the full quantum field-theoretic description of the macroscopic phenomena introduced in the previous chapter, we should first review the corresponding quantum-mechanical approach—quantum statistical mechanics.
openaire +1 more source
1987
The preceding formulation of statistical mechanics is perhaps the simplest application of probability theory to the many-body problem. Although it is consistent with the principles of quantum mechanics, it is not manifestly so. That is, the PME itself is based on the notions of information and measurement, but a general formulation should also ...
openaire +1 more source
The preceding formulation of statistical mechanics is perhaps the simplest application of probability theory to the many-body problem. Although it is consistent with the principles of quantum mechanics, it is not manifestly so. That is, the PME itself is based on the notions of information and measurement, but a general formulation should also ...
openaire +1 more source
2009
Many-body theory stands at the foundation of modern quantum statistical mechanics. It is introduced here to graduate students in physics, chemistry, engineering and biology. The book provides a contemporary understanding of irreversibility, particularly in quantum systems.
William C. Schieve, Lawrence P. Horwitz
openaire +1 more source
Many-body theory stands at the foundation of modern quantum statistical mechanics. It is introduced here to graduate students in physics, chemistry, engineering and biology. The book provides a contemporary understanding of irreversibility, particularly in quantum systems.
William C. Schieve, Lawrence P. Horwitz
openaire +1 more source