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Announcement</title></head><body>
<div>Next week's MIT QIP seminar will take place on Monday, Feb. 14 at
16:00 in 4-237, and features:</div>
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<div align="center"><font size="+2"><b>Physical Resources,
Entanglement, and the Power of Quantum Computation</b></font></div>
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<div align="center"><font size="+1"><i>by</i> Prof. Carlton M. Caves
(<i>Univ. of New Mexico</i>)</font></div>
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<div align="center"><u>ABSTRACT</u></div>
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<blockquote>Requiring that a quantum computer not need an
exponentially growing amount of any physical resource places stringent
constraints on the systems that can act as quantum computers. In
particular, a quantum computer must be made up of subsystems, usually
qubits, thus ruling out implementing a quantum computer in a single
atom or by using the interference of classical waves.
Furthermore, if a quantum computer made up of subsystems performs some
computation exponentially faster than any classical computer, there
must be global entanglement among all the subsystems at some point
during the computation. Having thus led up to the conclusion
that quantum entanglement is the essential ingredient for quantum
computation, I will discuss why this conclusion isn't
ironclad.</blockquote>
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