Universal protection of unitary evolution from slow noise: dynamical control pushed to the extreme

Details Universal protection of unitary evolution from slow noise: dynamical control pushed to the extreme Universal protection of unitary evolution from slow noise: dynamical control pushed to the extreme

2009-05-20

arxiv.org/abs/0905.3254v1

Physics

Quantum Physics

10 pages, 1 figure

Scientific paper

We propose a technique that allows to simultaneously perform universal control of the evolution operator and compensate for the first order contribution of an arbitrary Hermitian constant noise. We show that, at least, a three-valued Hamiltonian is needed in order to protect the system against any such noise. This technique is illystrated by an explicit algorithm for a control sequence that is applied to numerically design a safe two-qubit gate.

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