Quantum computers inch closer?

[AARG!Anonymous]

Bear writes:
> In this case you'd need to set up the wires-and-gates model
> in the QC for two ciphertext blocks, each attached to an
> identical plaintext-recognizer function and attached to the
> same key register.  Then you set up the entangled state,
> and collapse the eigenvector on the eigenstate where the
> ciphertext for block A and block B is produced, and the
> plaintext recognizer for both block A and block B return
> "1", and then you'd read the plaintext and key out of the
> appropriate locations (dots?) in the qchip.

The problem is that you can't forcibly collapse the state vector into your
wished-for eigenstate, the one where the plaintext recognizer returns a 1.
Instead, it will collapse into a random state, associated with a random
key, and it is overwhelmingly likely that this key is one for which the
recognizer returns 0.

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