Universal dynamical decoupling of multiqubit states from environment

Details Universal dynamical decoupling of multiqubit states from environment Universal dynamical decoupling of multiqubit states from environment

2011-04-26

arxiv.org/abs/1104.5021v2

Phys. Rev. A 84, 060302(R) (2011)

Physics

Quantum Physics

4+ pages, 2 figures

Scientific paper

10.1103/PhysRevA.84.060302

We study the dynamical decoupling of multiqubit states from environment. For a system of m qubits, the nested Uhrig dynamical decoupling (NUDD) sequence can efficiently suppress generic decoherence induced by system-environment interaction to order N using (N+1)^2m pulses. We prove that the NUDD sequence is universal, i.e., it can restore the coherence of m-qubit quantum system independent of the details of system-environment interaction. We also construct a general mapping between dynamical decoupling problems and discrete quantum walks in certain functional spaces.

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