decoherence
Language: English
Part of speech: noun
Pronunciation: ipa: /diːkəʊˈhɪəɹəns/
Forms: form: decoherences
Etymology: First attested 1902 (OED) in the electrical engineering sense "the resetting of a coherer." From decohere (also 1902) + -ence, representing the verbal noun (compare decohesion, decoherency). The quantum mechanics concept was introduced in 1970 by German physicist H. Dieter Zeh, writing in the journal Foundations of Physics.
Senses: examples: text: There is a sense in which simple interference effects are destroyed when a system's environment becomes correlated with its state. This phenomenon is called decoherence. I shall consider three approaches here. According to one, decoherence alone explains why we get determinate records. According to another, decoherence helps one to formulate a satisfactory interpretation of Everett by selecting a globally preferred basis that makes the right physical facts determinate in each Everett branch. According to a third, decoherence sects a locally preferred basis for each observer that makes the right physical facts determinate from the perspective of that particular observer.
ref: 1999, Jeffrey A. Barrett, The Quantum Mechanics of Minds and Worlds, Oxford University Press, page 221:
text: We have already alluded to decoherence in connection with the emergence of classical space-time, the ‘collapse′ of the wave function (Case 3) and the notion of entanglement. Physicists have hailed the discovery of decoherence as ‘the most important advance in the foundation of quantum theory since Bell's inequalities.’¹³¹ This praise is based on good reasons: (a) decoherence offers new ways of understanding quantum mechanics for it embodies a critique of entrenched terminology (‘collapse’ of the wave function, complementarity); (b) it is testable since it appeals to physical processes; (c) it offers an insight into a much more fundamental level of quantum indeterminacy.
ref: 2004, Friedel Weinert, The Scientist as Philosopher: Philosophical Consequences of Great Scientific Discoveries, Springer, page 272:
text: A detailed investigation of decoherence during gating due to a bosonic environment was performed in the original work of Loss and DiVincenzo. Since then, there have been many studies of leakage and decoherence in the context of the quantum-dot quantum computing proposal.
ref: 2008, D. Klauser, W. A. Coish, Daniel Loss, “Quantum-Dot Spin Qubit and Hyperfine Interaction”, in Rolf Haug, editor, Advances in Solid State Physics, 46, Springer, page 20:
text: One way of preventing both decoherences is to set up the system in a "non-decoherent quantum state."
ref: 2015, Fernanda Samaniega, “Manipulating Spins: Causality and Decoherence”, in Uskali Mäki, Ioannis Votsis, Stéphanie Ruphy, Gerhard Schurz, editors, Recent Developments in the Philosophy of Science: EPSA13 Helsinki, Springer,, page 191:
qualifier: quantum mechanics
glosses: Loss of quantum coherence (phase relation between the quantum states of particles) in a physical system as it interacts with its environment.
topics: engineering
natural-sciences
physical-sciences
glosses: The normal condition of sensitiveness in a coherer; reversion to such condition.
Synonyms: sense: quantum mechanics
word: decoherency
sense: quantum mechanics
word: quantum decoherence
Derived terms: decoherence time
predecoherence
Related terms: coherence
decoherent
dephasing
einselection
quantum entanglement
quantum interference