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Complexity Digest 2003.52 - 16.01
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Dec. 29, 2003

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Pseudo-Random Unitary Operators for Quantum Information Processing, Science
 









Excerpt: Unfortunately, the implementation of random unitary operators on a
quantum processor is exponentially hard. Here we introduce a method for
generating pseudo-random unitary operators that can reproduce those statistical
properties of random unitary operators most relevant to quantum information
tasks. This method requires exponentially fewer resources, and hence enables the
practical application of random unitary operators in quantum communication and
information processing protocols. Using a nuclear magnetic resonance quantum
processor, we were able to realize pseudorandom unitary operators that reproduce
the expected random distribution of matrix elements.
Source: Pseudo-Random Unitary Operators for Quantum Information Processing[
http://www.sciencemag.org/cgi/content/abstract/302/5653/2098 ], Joseph Emerson,
Yaakov S. Weinstein, Marcos Saraceno, Seth Lloyd, David G. Cory, Science:
2098-2100, 03/12/19

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