Control quantum evolution speed of a single dephasing qubit for arbitrary initial states via periodic dynamical decoupling pulses

• DOI: 10.1038/srep43654
• Publication Date: 2017-03-08T14:35:47Z
• Authors: Ya-Ju Song; Qing-Shou Tan; Le-Man Kuang
• Keywords: Dephasing; Dynamical decoupling; Time evolution; Flux qubit; Coherence time

Abstract We investigate the possibility to control quantum evolution speed of a single dephasing qubit for arbitrary initial states by use periodic dynamical decoupling (PDD) pulses. It is indicated that limit time (QSLT) determined and final coherence qubit, as well non-Markovianity system under consideration during when subjected zero-temperature Ohmic-like reservoir. shown can be modulated PDD Our results show with non-vanishing coherence, pulses used induce potential acceleration in short-time regime, while lead speedup slow down long-time regime. demonstrate effect on QSLT Ohmic or sub-Ohmic spectrum (Markovian reservoir) much different from super-Ohmic (non-Markovian reservoir).