“Quantum process”的意思、由来-开放百科全书

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Quantum process

释义

References

In quantum mechanics, a quantum process is a somewhat ambiguous term which usually refers to the time evolution of an (open) quantum system. Under very general assumptions, a quantum process is described by the quantum operation formalism (also known as a quantum dynamical map), which is a linear, trace-preserving, and completely positive map from the set of density matrices to itself.

For instance, in quantum process tomography, the unknown quantum process is assumed to be a quantum operation.

However, not all quantum processes can be captured within the quantum operation formalism;^[1]^[2] in principle, the density matrix of a quantum system can undergo completely arbitrary time evolution.

References

1. ^Philip Pechukas, [https://archive.is/20120731183913/http://prl.aps.org/abstract/PRL/v73/i8/p1060_1 "Reduced Dynamics Need Not Be Completely Positive"], Phys. Rev. Lett. 73, 1060 (1994).
2. ^Anil Shaji and E.C.G. Sudarshan "Who's Afraid of not Completely Positive Maps?", Physics Letters A Volume 341, 20 June 2005, Pages 48–54

{{Cite book|last1=Nielsen|first=Michael A.|authorlink1=Michael Nielsen|last2=Chuang|first2=Isaac L.|authorlink2=Isaac Chuang|title=Quantum Computation and Quantum Information|publisher=Cambridge University Press|location=Cambridge|year=2010|edition=2nd|oclc=844974180|isbn=978-1-107-00217-3|title-link=Quantum Computation and Quantum Information (book)}}

1 : Quantum mechanics

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