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Quantum Computation by Local Measurement
Quantum Computation by Local Measurement
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When 
May 14, 2014 from 02:00 pm to 03:30 pm 
Speaker  TzuChieh Wei 
Speaker Information  C.N. Yang Institute for Theoretical Physics State University of New York at Stony Brook 
Where  1311 HN 
Contact Name  Mark Hillery 
Contact Email  mhillery@hunter.cuny.edu 
Contact Phone  2127725253 
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Abstract:
The empirical law of Gordon Moore describes the doubling of the transistor number roughly every two years and is a surprisingly good approximation of how the semiconductor technology has evolved over the past few decades. But if the trend continues, Moore's law will break down when the size of a transistor approaches that of an atom, where quantum effects dominate. Quantum computation, as envisioned by Feynman, is thus a necessary and inevitable technology to pursue. In this talk, I will give an overview of what a quantum computer is, and how we understand it from different models of quantum computation. I will focus more on one particular model, namely, the measurementbased model of quantum computation. It is very different from what we usually think of quantum mechanicsthe unitary evolution, but uses an important ingredient of it, i.e., measurement. A measurementbased quantum computer, also known as a oneway quantum computer, exploits manybody quantum entanglement and requires only the ability to measure local observables and achieves the same computational power as other models of quantum computer. I will also describe our effort in searching for the desired quantum entangled states that serve as the universal resource. In particular, these resource states can arise from ground states of certain quantum antiferromagnet. Moreover, for certain spin models, even thermal states are useful for quantum computation.