In quantum physics, a quantum state is a mathematical entity that embodies the knowledge of a quantum system. Quantum mechanics specifies the construction, ...
In physics, a quantum state space is an abstract space in which different "positions" represent, not literal locations, but rather quantum states of some ...
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In quantum mechanics, a two-state system is a quantum system that can exist in any quantum superposition of two independent (physically distinguishable) ...
Quantum superposition is a fundamental principle of quantum mechanics that states that linear combinations of solutions to the Schrödinger equation are also ...
A quantum state is any possible state in which a quantum mechanical system can be. A fully specified quantum state can be described by a state vector, ...
In quantum physics, a measurement is the testing or manipulation of a physical system to yield a numerical result. A fundamental feature of quantum theory ...
Jul 9, 2021 · The mathematical way of expressing mixed states (states that are not superpositions) is a density matrix (https://en.wikipedia.org/wiki/ ...
The purity defines a measure on quantum states, giving information on how much a state is mixed.
In quantum mechanics, notably in quantum information theory, fidelity is a measure of the "closeness" of two quantum states. It expresses the probability ...
Oct 11, 2013 · According to Wikipedia, if a system has 50% chance to be in state |ψ1⟩ and 50% to be in state |ψ2⟩, then this is a mixed state. Now, consider ...