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000020143 084__ $$2WoS$$aOptics
000020143 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000020143 1001_ $$0P:(DE-Juel1)VDB105200$$aPasini, S.$$b0$$uFZJ
000020143 245__ $$aSymmetry-enhanced performance of dynamical decoupling
000020143 260__ $$aCollege Park, Md.$$bAPS$$c2011
000020143 264_1 $$2Crossref$$3online$$bAmerican Physical Society (APS)$$c2011-10-25
000020143 264_1 $$2Crossref$$3print$$bAmerican Physical Society (APS)$$c2011-10-01
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000020143 440_0 $$04918$$aPhysical Review A$$v84$$x0556-2791$$y4
000020143 500__ $$aWe would like to thank Gregory Quiroz and Daniel A. Lidar for helpful discussions. The financial support by the grant UH 90/5-1 of the DFG is gratefully acknowledged.
000020143 520__ $$aWe consider a system with general decoherence and a quadratic dynamical decoupling sequence (QDD) for the coherence control of a qubit coupled to a bath of spins. We investigate the influence of the geometry and of the initial conditions of the bath on the performance of the sequence. The overall performance is quantified by a distance norm d. It is expected that d scales with tau, the total duration of the sequence, as tau(min{Nx, Nz}+1), where N-x and N-z are the number of pulses of the outer and of the inner sequence, respectively. We show both numerically and analytically that the state of the bath can boost the performance of QDD under certain conditions: The scaling of QDD for a given number of pulses can be enhanced by a factor of 2 if the bath is prepared in a highly symmetric state and if the system Hamiltonian is SU(2) invariant.
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000020143 7001_ $$0P:(DE-HGF)0$$aUhrig, G.S.$$b1
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000020143 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevA.84.042336
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