A very core concept of modern physics is that the value of a wave function of a physical system or entity at any given point in time can determine the value of the same at a future time. This is one of the most fundamental postulates of Copenhagen’s interpretation of quantum mechanics. It states that the complete information about a physical system is encoded within its wave function and is present until this wave function collapses. The black hole information paradox results from the combination of quantum mechanics and general relativity which suggests that any physical information including the wave function of a physical body could permanently disappear within a black hole.
The two relevant principles that come into play are Quantum determinism and reversibility. Quantum determination suggests that once we know the present wave function its future changes can be accurately determined by the evolution operator. While reversibility refers that the evolution operator has an inverse meaning and the past wave functions are also similarly unique.
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