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Date: Mon, 9 Nov 1998 14:30:13 -0500 (EST) From: physnews@aip.org (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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