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update.401 (fwd)
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> Date: Mon, 9 Nov 1998 14:30:13 -0500 (EST)
> From: [email protected] (AIP listserver)
> Subject: update.401
> INFLUENCE OF COSMIC RAYS ON EARTH'S CLIMATE. Do
> SUREFIRE QUANTUM ENTANGLEMENT, the ability to
> interlink two quantum particles with practically 100% certainty, has
> been achieved by a NIST group (Quentin Turchette, 303-497-3328),
> advancing hopes for ultrapowerful quantum computers. Previously,
> physicists obtained entangled particles as a byproduct of some
> random or probabilistic process, such as the production of two
> correlated photons that occasionally occurs when a single photon
> passes through a special crystal. Receiving entangled pairs in this
> way is fine for tests of quantum nonlocality (Update 399), but
> entangling a large number of quantum particles--essential for
> building a practical quantum computer--becomes much less likely if
> it is dependent on a probabilistic process. In their "deterministic
> entanglement" process, the NIST researchers trap a pair of
> beryllium ions in a magnetic field. Using a predetermined sequence
> of laser pulses, they entangle one ion's internal spin to its external
> motion, and then entangle the motion to the spin of the other atom.
> The group believes that it will be able to entangle multiple ions with
> this process. (Turchette et al, Physical Review Letters, 26 October
> 1998.)
> THE PETAWATT is the name for what is currently the world's
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