Decoherence results from a transfer of quantum information: when one object becomes entangled with another, information about each object is no longer confined to the object itself. The role of decoherence in measurement, then, is not simply to destroy quantum interference and make objects become more classical the more strongly they’re wired into their environment. It creates a kind of ‘replica’ of the object itself – or rather, of the pointer states of that object – in the environment. It is this replica or imprint that eventually produces a reading in our classical measuring apparatus.
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