Say Alice gives Bob the wave-function, a momentum eigenstate, of a charged particle. Bob then makes a local gauge transformation on the wave-function,(adsbygoogle = window.adsbygoogle || []).push({});

ψ --> exp[iqθ(X,t)]ψ.

Can Alice now undo the local gauge transformation with the right addition (or subtraction?) of electromagnetic fields?

Hope that was worded right. Thanks for any help!

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# Bob makes a local gauge trans., can Alice undo with some fields?

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