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Title: Protecting unknown two-qubit entangled states by nesting Uhrig's dynamical decoupling sequences
Authors: Mukhtar, M.
Soh, W.T.
Saw, T.B.
Gong, J. 
Issue Date: 30-Nov-2010
Citation: Mukhtar, M., Soh, W.T., Saw, T.B., Gong, J. (2010-11-30). Protecting unknown two-qubit entangled states by nesting Uhrig's dynamical decoupling sequences. Physical Review A - Atomic, Molecular, and Optical Physics 82 (5) : -. ScholarBank@NUS Repository.
Abstract: Future quantum technologies rely heavily on good protection of quantum entanglement against environment-induced decoherence. A recent study showed that an extension of Uhrig's dynamical decoupling (UDD) sequence can (in theory) lock an arbitrary but known two-qubit entangled state to the Nth order using a sequence of N control pulses. By nesting three layers of explicitly constructed UDD sequences, here we first consider the protection of unknown two-qubit states as superposition of two known basis states, without making assumptions of the system-environment coupling. It is found that the obtained decoherence suppression can be highly sensitive to the ordering of the three UDD layers and can be remarkably effective with the correct ordering. The detailed theoretical results are useful for general understanding of the nature of controlled quantum dynamics under nested UDD. As an extension of our three-layer UDD, it is finally pointed out that a completely unknown two-qubit state can be protected by nesting four layers of UDD sequences. This work indicates that when UDD is applicable (e.g., when the environment has a sharp frequency cutoff and when control pulses can be taken as instantaneous pulses), dynamical decoupling using nested UDD sequences is a powerful approach for entanglement protection. © 2010 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.82.052338
Appears in Collections:Staff Publications

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