Monday, June 22, 2009

Wavefunction Uncollapse

Uncollapsing the wavefunction by undoing quantum measurements
We review and expand on recent advances in theory and experiments concerning the problem of wavefunction uncollapse: Given an unknown state that has been disturbed by a generalized measurement, restore the state to its initial configuration. We describe how this is probabilistically possible with a subsequent measurement that involves erasing the information extracted about the state in the first measurement.