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Title: Universal dynamical decoupling: Two-qubit states and beyond
Authors: Mukhtar, M.
Saw, T.B.
Soh, W.T.
Gong, J. 
Issue Date: 29-Jan-2010
Citation: Mukhtar, M., Saw, T.B., Soh, W.T., Gong, J. (2010-01-29). Universal dynamical decoupling: Two-qubit states and beyond. Physical Review A - Atomic, Molecular, and Optical Physics 81 (1) : -. ScholarBank@NUS Repository.
Abstract: Uhrig's dynamical decoupling pulse sequence has emerged as a universal and highly promising approach to decoherence suppression. So far, both the theoretical and experimental studies have examined single-qubit decoherence only. This work extends Uhrig's universal dynamical decoupling from one-qubit to two-qubit systems and even to general multilevel quantum systems. In particular, we show that by designing appropriate control Hamiltonians for a two-qubit or a multilevel system, Uhrig's pulse sequence can also preserve a generalized quantum coherence measure to the order of 1+O(TN+1) with only N pulses. Our results lead to a very useful scheme for efficiently locking two-qubit entangled states. Future important applications of Uhrig's pulse sequence in preserving the quantum coherence of multilevel quantum systems can also be anticipated. © 2010 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.81.012331
Appears in Collections:Staff Publications

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