Noise enhanced performance of adiabatic quantum computing by lifting degeneracies

Details Noise enhanced performance of adiabatic quantum computing by lifting degeneracies Noise enhanced performance of adiabatic quantum computing by lifting degeneracies

2010-02-12

arxiv.org/abs/1002.2574v3

Phys. Rev. A 82, 052328 (2010)

Physics

Quantum Physics

12 pages and 4 figures in preprint format. References in article corrected and journal reference added

Scientific paper

10.1103/PhysRevA.82.052328

We investigate the symmetry breaking role of noise in adiabatic quantum computing using the example of the CNOT gate. In particular, we analyse situations where the choice of initial configuration leads to symmetries in the Hamiltonian and degeneracies in the spectrum. We show that, in these situations, there exists an optimal level of noise that maximises the success probability and the fidelity of the final state. The effects of an artificial noise source with a time-dependent amplitude are also explored and it is found that such a scheme would offer a considerable performance enhancement.

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