The first and for a long time the most widespread interpretation, the "Copenhagen interpretation", states that the object is initially in a state of all these contradictory properties (e.g. in different locations), but when measured it "chooses" one option , so the others disappear without a trace.
In recent decades, however, another perspective has become increasingly
important,
the "many worlds interpretation" Developed in 1957 by Hugh Everett. What bothered him was that,
under the Copenhagen interpretation, the alternative properties simply
disappear. There should be no such thing in physics. Moreover,
the Copenhagen interpretation cannot explain how
the alternatives disappear.
According to Everett, all properties are equally real, even those that
cannot be observed. But this leads to a radical consequence: With each observation, the universe is divided into countless worlds in
which each of the possible properties is realized. If we see the particle in position A, then there must be
a second world in which a copy of us observes the particle in position B.
Willow, the company's chip is associated with these claims,
purported to appear in a journal.
An answer already given by Werner Heisenberg inThe Physical Principles of Quantum Theory:
‘It must be remembered here that human language quite generally allows us to form sentences from which no consequences can be drawn, which are therefore actually completely empty of content, although they convey a kind of vivid idea. For example, the assertion that there is a second world in addition to our own, with which, however, no connection is possible in principle, leads to no conclusion at all; nevertheless, this assertion creates a kind of image in our imagination.’ (Translated from Wikipedia: Many-worlds interpretation.)
So we should see Neven's claim as a clever marketing measure for the Google chip.
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