Preserving qubit coherence by dynamical decoupling

In quantum information processing, it is vital to protect the coherence of qubits in noisy environments. Dynamical decoupling (DD), which applies a sequence of flips on qubits and averages the qubit-environment coupling to zero, is a promising strategy compatible with other desired functionalities,...

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Bibliographic Details
Published in:Frontiers of physics 2011-03, Vol.6 (1), p.2-14
Main Authors: YANG, Wen, WANG, Zhen-Yu, LIU, Ren-Bao
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Atomic
Coherence
Condensed Matter Physics
Coupling
Data processing
decoherence
Decoupling
dynamical decoupling
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum phenomena
qubit
Qubits (quantum computing)
Review Article
物理学
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Summary:In quantum information processing, it is vital to protect the coherence of qubits in noisy environments. Dynamical decoupling (DD), which applies a sequence of flips on qubits and averages the qubit-environment coupling to zero, is a promising strategy compatible with other desired functionalities, such as quantum gates. Here, we review the recent progresses in theories of dynamical decoupling and experimental demonstrations. We give both semiclassical and quantum descriptions of the qubit decoherence due to coupling to noisy environments. Based on the quantum picture, a geometrical interpretation of DD is presented. The periodic Carr-Purcell-Meiboom-Gill DD and the concatenated DD are reviewed, followed by a detailed exploration of the recently developed Uhrig DD, which employs the least number of pulses in an unequally spaced sequence to suppress the qubit-environment coupling to a given order of the evolution time. Some new developments and perspectives are also discussed.
ISSN:2095-0462
2095-0470
DOI:10.1007/s11467-010-0113-8