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First-order transitions and the performance of quantum algorithms in random optimization problems

Physical Review Letters, ISSN: 0031-9007, Vol: 104, Issue: 20, Page: 207206
2010
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Article Description

We present a study of the phase diagram of a random optimization problem in the presence of quantum fluctuations. Our main result is the characterization of the nature of the phase transition, which we find to be a first-order quantum phase transition. We provide evidence that the gap vanishes exponentially with the system size at the transition. This indicates that the quantum adiabatic algorithm requires a time growing exponentially with system size to find the ground state of this problem. © 2010 The American Physical Society.

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