WILHELM OCHS** SOME COMMENTS ON THE CONCEPT OF STATE IN QUANTUM MECHANICS* 1 In this paper we shall discuss some interpretational aspects of the concept of state in quantum mechanics which are related to the "ignorance inter- pretation of states" and to the problem of the completeness of ...
Quantum mechanicsPure and mixed statesDecoherenceAccording to a formulation of the quantum theory presented by Rudolf Haag and Daniel Kastler more than half a century ago, the observables of a system, rather than the states, are the primary objects. In this paper we assume that only those ...
A. A quantum particle can only exist in one state at a time. B. A quantum particle can exist in multiple states simultaneously. C. Quantum particles always follow classical physics laws. D. The superposition principle only applies to photons. ...
states (e.g. lack of inflow of depolarized atoms), (v) ability to work with large optical densities (OD ~100 and more) without experiencing too strong decoherence, last-not-least (vi) possibility of exploring quantum-degeneracy regime, where ultra-low temperatures have, in fact, no ...
Quantum Mechanics_ _ vacuum state In quantum field theory, the vacuum state (also called the vacuum) is the quantum state with the lowest possible energy. Generally, it contains no physical particles. Zero- -point field is sometimes used [ by whom? ] as a synonym for the vacuum state of...
Quantum mechanics provides a highly accurate description of a wide variety of physical systems. However, a demonstration that quantum mechanics applies equally to macroscopic mechanical systems has been a long-standing challenge, hindered by the difficulty of cooling a mechanical mode to its quantum gro...
Quantum Structural Studies (Classical Emergence from the Quantum Level) || Quantum Structures: An Introduction Quantum mechanics offers a striking, genuinely novel observation: it is possible to obtain more information about a closed composite system than about the subsystems constituting that system. ...
In quantum computation every unitary operation can be decomposed into quantum circuits-a series of single-qubit rotations and a single type entangling two-qubit gates, such as controlled-NOT (CNOT) gates. Two measures are important when judging the complexity of the circuit: the total number of ...
Some general foundational issues of quantum mechanics are considered and are related to aspects of quantum computation. The importance of quantum entanglement and quantum information is discussed and their curious acausal properties are addressed. The question of quantum state reduction is also considered...
Clarifying the relation between the whole and its parts is crucial for many problems in science. In quantum mechanics, this question manifests itself in the quantum marginal problem, which asks whether there is a global pure quantum state for some given marginals. This problem arises in many con...