Under the principle that quantum mechanical observables are invariant under relevant symmetry transformations, we explore how the usual, non-invariant quantities may capture measurement statistics. Using a relativisation mapping, viewed as the incorporation of a quantum reference frame, we show that the usual quantum description approximates the relative one precisely when the reference system admits an appropriate localisable quantity and a localised state. From this follows a new perspective on the nature and reality of quantum superpositions and optical coherence.
|Number of pages||5|
|Journal||EPL (Europhysics Letters)|
|Early online date||4 Apr 2017|
|Publication status||E-pub ahead of print - 4 Apr 2017|
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- quantum mechanics
- quantum reference frames