On Tuesday, May 22, 2018 at 10:41:11 PM UTC, [email protected] wrote: > > > > On Tuesday, May 22, 2018 at 10:06:39 PM UTC, Brent wrote: >> >> >> >> On 5/22/2018 6:39 AM, [email protected] wrote: >> >> I'm OK with getting rid of the projection operator. Are you now claiming >>> information is lost or inaccessible in these orthogonal subspaces and >>> therefore quantum measurements cannot be reversed? >>> >>> >>> They are inaccessible to the people of any one world of the MWI. >>> >> >> No! Irreversible FAPP! Think heat bath or Bucky Balls. >> >> https://en.wikipedia.org/wiki/Quantum_decoherence >> >> Examples of non-unitary modelling of decoherence Decoherence >> <https://en.wikipedia.org/wiki/Decoherence> can be modelled as a non- >> unitary <https://en.wikipedia.org/wiki/Unitary_operator> process by >> which a system couples with its environment (although the combined system >> plus environment evolves in a unitary fashion).[4] >> <https://en.wikipedia.org/wiki/Quantum_decoherence#cite_note-Lidar_and_Whaley-4> >> >> Thus the dynamics of the system alone, treated in isolation, are >> non-unitary and, as such, are represented by irreversible transformations >> <https://en.wikipedia.org/wiki/Irreversibility> acting on the system's >> Hilbert >> space <https://en.wikipedia.org/wiki/Hilbert_space>, H {\displaystyle >> {\mathcal {H}}} [image: {\mathcal {H}}]. Since the system's dynamics are >> represented by irreversible representations, then any information present >> in the quantum system can be lost to the environment or heat bath >> <https://en.wikipedia.org/wiki/Heat_bath>. Alternatively, the decay of >> quantum information caused by the coupling of the system to the environment >> is referred to as decoherence.[3] >> <https://en.wikipedia.org/wiki/Quantum_decoherence#cite_note-Bacon-3> >> Thus decoherence is the process by which information of a quantum system is >> altered by the system's interaction with its environment (which form a >> closed system), hence creating an entanglement >> <https://en.wikipedia.org/wiki/Quantum_entanglement> between the system >> and heat bath (environment). As such, since the system is entangled with >> its environment in some unknown way, a description of the system by itself >> cannot be made without also referring to the environment (i.e. without also >> describing the state of the environment). >> >> >> Notice that this doesn't explain how one gets to a single result. >> > I did, but you're avoiding the key point; if the theory is on the right track, and I think it is, quantum measurements are irreversible FAPP. The superposition is converted into mixed states, no interference, and no need for the MWI. I still don't get it -- why you and Bruce keep resorting to the MWI to deny reversible FAPP, when both of you have huge disrespect for the MWI. AG
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