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Decoherence has been developed into a complete framework, but there is controversy as to whether it solves the measurement problem, as the founders of decoherence theory admit in their seminal papers. [16] The study of decoherence as a proper subject began in 1970, with H. Dieter Zeh's paper "On the Interpretation of Measurement in Quantum Theory".
In the 1970s and 1980s, the theory of decoherence helped to explain the appearance of quasi-classical realities emerging from quantum theory, [53] but was insufficient to provide a technical explanation for the apparent wave function collapse.
In quantum mechanics, the consistent histories or simply "consistent quantum theory" [1] interpretation generalizes the complementarity aspect of the conventional Copenhagen interpretation. The approach is sometimes called decoherent histories [ 2 ] and in other work decoherent histories are more specialized.
That these codes allow indeed for quantum computations of arbitrary length is the content of the quantum threshold theorem, found by Michael Ben-Or and Dorit Aharonov, which asserts that you can correct for all errors if you concatenate quantum codes such as the CSS codes—i.e. re-encode each logical qubit by the same code again, and so on, on ...
Quantum decoherence is a mechanism through which quantum systems lose coherence, and thus become incapable of displaying many typically quantum effects: quantum superpositions become simply probabilistic mixtures, and quantum entanglement becomes simply classical correlations.
The in depth study of quantum decoherence has proposed that collapse is related to the interaction of a quantum system with its environment. Historically, Werner Heisenberg was the first to use the idea of wave function reduction to explain quantum measurement.
Mott's analysis, while it predates modern decoherence theory, fits squarely within its approach. [8] Bryce DeWitt points to the dramatic mass difference between the alpha particle and the electrons in Mott's analysis as characteristic of decoherence of the state of the more massive system, the alpha particle.
Zeh further claims that decoherence makes it possible to identify the fuzzy boundary between the quantum microworld and the world where the classical intuition is applicable. [ 25 ] [ 26 ] Quantum decoherence becomes an important part of some modern updates of the Copenhagen interpretation based on consistent histories .