I have been studying black holes lately. One complaint I hear often is that information is lost when a particle enters a black hole. Supposedly, this never happens outside a black hole. It is argued that it is possible to determine a particle's past states and future states. OK, so imagine you have two isomers (the chemistry definition). You break them down into two sets of protons, neutrons and electrons. You forget which set belongs to which isomer. You take one set to a quantum physicist. Can he tell which isomer the set of protons, neutrons and electrons came from? If so, how? Or is that information lost?
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