Decoherence and double-slit with eraser

[VALENCIANA]

If I say that decoherence is an irreversible loss of information, then in the double-slit with erasure when initially decoherence has occurred with the measurement, and then after erasure of the information the state is again as it was at the beginning , how can this occur if the initial decoherence was irreversible?

 

[bhobba]

If I say that decoherence is an irreversible loss of information,

You can say that - but that is not what decoherence is.

All the erasure experiment shows is in simple cases decoherence is reversible.

Thanks
Bill