Constructing Noise Filter by Dynamical Decoupling
Dynamical decoupling (DD) emerges as a promising tool to suppress decoherence of quantum systems by eliminating the system-environment coupling. We investigate its power in combating pure dephasing of a qubit under random classical noise. Interestingly,the decoherence rate can be viewed as the interplay between noise spectrum and a controllable.lter function. More speci.cally,the.lter function is determined by the DD sequence we employed. Here we take Uhrig DD (UDD) as a benchmark sequence to illustrate the.ltering process. We.nd that UDD sequence works as a perfect dynamical.lter for low-frequency noise. For spectrum with hard cutoff,UDD increases the performance order by order with linearly increased number of pulses. However,for noise spectrum with soft cutoff,the required pulse number grows exponentially.
PAN Yu XI Zai-Rong CUI Wei
Key Laboratory of Systems and Control,Institute of Systems Science,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,Peoples Republic of China
国际会议
The 30th Chinese Control Conference(第三十届中国控制会议)
烟台
英文
1-4
2011-07-01（万方平台首次上网日期，不代表论文的发表时间）