Physics – Undoing a quantum measurement

This is to relay a link about something that sends a shiver of delighted confusion down my back: The idea of undoing a wavefunction collapse! (And if you haven’t been reading ‘Physics’, do: Accessible writing on current research).

In general,  measurement .. is an irreversible process. However, there are more gentle measurement schemes that only acquire partial information and so escape the constraint of traveling down this one-way street. A recent experiment on superconducting phase qubits performed by Nadav Katz and colleagues at University of California, Santa Barbara, and the University of California, Riverside [1], demonstrates that the effect of such a measurement can be “undone” and the initial state can be recovered.

via Physics – Undoing a quantum measurement

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