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--></style><title>MIT QIP Special Seminar
Announcement</title></head><body>
<div>On Tuesday, April 6 from 10:00 thru 11:30 AM in the Marlar Lounge
(37-252) there will be a special seminar of interest to the local QIP
community:</div>
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<div align="center"><font size="+2"><b>Ion Trapology for Scalable
Quantum Information Processing</b></font></div>
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<div align="center"><font size="+1"><i>by</i> David J. Wineland
(<i>Time & Frequency Division</i>, NIST,<i> Boulder</i>
CO)</font></div>
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<div align="center"><u>ABSTRACT</u></div>
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<blockquote>At NIST, by using a few trapped atomic ions, we have been
able to implement the basic one- and two-qubit gate operations
required for quantum information processing [<u>1</u>]. The
challenge is to scale up this system in order to perform large-scale
processing. One way this might be accomplished is to use an
array of ion trap zones, each of which contains a small number of ions
- to facilitate efficient gates. By shuttling ions between
zones, gates between selected ions in the array could be achieved
[<u>2</u>]. By separating ions contained in one trap, moving
them to separate trap zones, and performing subsequent logic
operations, we can now implement the basic steps of this scheme.
However, we now face significant practical problems in how to actually
fabricate the required large trap structures, how to wire up the trap
electrodes and control their potentials, and how to produce and
manipulate the many laser beams that will be needed in such a device.
These and other issues will be discussed.</blockquote>
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<blockquote>[<u>1</u>] "The physical implementation of quantum
computation", D. P. DiVincenzo, in<i> Scalable Quantum
Computers</i>, ed. by S. L. Braunstein and H. K. Lo (Wiley-VCH,
Berlin, 2001), pp. 1-13.</blockquote>
<blockquote>[<u>2</u>] "Architecture for a large-scale ion-trap
quantum computer", D. Kielpinski, C. Monroe, and D. J.
Wineland,<i> Nature</i><b> 417</b>, 709-711 (2002).</blockquote>
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