On Tuesday, May 22, 2018 at 10:46:37 PM UTC, [email protected] wrote: > > > > 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 >
Above I meant to write " ... to deny IRreversible FAPP ... " AG > >>> Brent >>> >> -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
