Quantum Darwinism and Envariance

Details Quantum Darwinism and Envariance Quantum Darwinism and Envariance

2003-08-28

arxiv.org/abs/quant-ph/0308163v1

Physics

Quantum Physics

Scientific paper

Effective classicality of a property of a quantum system can be defined using redundancy of its record in the environment. This allows quantum physics to approximate the situation encountered in the classical world: The information about a classical system can exist independently from its state. In quantum theory this is no longer possible: In an isolated quantum system the state and the information about it are inextricably linked, and any measurement may -- and usually will -- reset that state. However, when the information about the state of a quantum system is spread throughout the environment, it can be treated (almost) as in classical physics.

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