> On 25 Oct 2018, at 17:12, [email protected] wrote:
>
>
>
> On Tuesday, October 23, 2018 at 10:39:11 PM UTC, [email protected] wrote:
> If a system is in a superposition of states, whatever value measured, will be
> repeated if the same system is repeatedly measured. But what happens if the
> system is in a mixed state? TIA, AG
>
> If you think about it, whatever value you get on a single trial for a mixed
> state, repeated on the same system, will result in the same value measured
> repeatedly. If this is true, how does measurement distinguish superposition
> of states, with mixed states? AG
That is not correct. You can distinguish a mixture of particles in the up or
down states with a set of 1/sqrt(2)(up+down) by measuring them with the
{1/sqrt(2)(up+down), 1/sqrt(2)(up-down}) discriminating apparatus. With the
mixture, half the particles will be defected in one direction, with the pure
state, they will all pass in the same direction. Superposition would not have
been discovered if that was not the case.
Bruno
>
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