Preserving qubit coherence by dynamical decoupling

Abstract

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.

12 pages, 2 figures, submitted to Frontiers of Physics

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Cited by in corpus (6)

• Robust dynamical decoupling for quantum computing and quantum memory
• Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
• Anomalous decoherence effect in a quantum bath
• Protection of quantum systems by nested dynamical decoupling
• Keeping a Single Qubit Alive by Experimental Dynamic Decoupling
• Extending quantum control of time-independent systems to time-dependent systems