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In quantum mechanics, the Pauli exclusion principle states that two or more identical particles with half-integer spins (i.e. fermions) cannot simultaneously occupy the same quantum state within a system that obeys the laws of quantum mechanics. This principle was formulated by Austrian physicist Wolfgang Pauli in 1925 for electrons, and later ...
Pauli matrices. Wolfgang Pauli (1900–1958), c. 1924. Pauli received the Nobel Prize in physics in 1945, nominated by Albert Einstein, for the Pauli exclusion principle. In mathematical physics and mathematics, the Pauli matrices are a set of three 2 × 2 complex matrices that are traceless, Hermitian, involutory and unitary.
In chemistry and physics, the exchange interaction is a quantum mechanical constraint on the states of indistinguishable particles. While sometimes called an exchange force, or, in the case of fermions, Pauli repulsion, its consequences cannot always be predicted based on classical ideas of force. [1] Both bosons and fermions can experience the ...
Pauli's equation is derived by requiring minimal coupling, which provides a g -factor g =2. Most elementary particles have anomalous g -factors, different from 2. In the domain of relativistic quantum field theory, one defines a non-minimal coupling, sometimes called Pauli coupling, in order to add an anomalous factor.
In computational complexity and optimization the no free lunch theorem is a result that states that for certain types of mathematical problems, the computational cost of finding a solution, averaged over all problems in the class, is the same for any solution method. The name alludes to the saying "no such thing as a free lunch", that is, no ...
For example, a single Grassmann number can be thought of as generating a one-dimensional space. A vector space, the m -dimensional superspace , then appears as the m -fold Cartesian product of these one-dimensional Λ . {\displaystyle \Lambda .} [ clarification needed ] It can be shown that this is essentially equivalent to an algebra with m ...
The Pauli effect or Pauli's device corollary is the supposed tendency of technical equipment to encounter critical failure in the presence of certain people. The term was coined after mysterious anecdotal stories involving Austrian theoretical physicist Wolfgang Pauli, describing numerous instances in which demonstrations involving equipment ...
The Clifford group is defined as the group of unitaries that normalize the Pauli group: Under this definition, is infinite, since it contains all unitaries of the form for a real number and the identity matrix . [2] Any unitary in is equivalent (up to a global phase factor) to a circuit generated using Hadamard, Phase, and CNOT gates, [3] so ...