共查询到20条相似文献,搜索用时 15 毫秒
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Oliveira FA Morgado R Lima MV Mello BA Hansen A Batrouni GG 《Physical review letters》2003,90(21):218901; discussion 218902
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Caupin F 《Physical review letters》2007,99(7):079601; author reply 079602
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Medford J Cywiński Ł Barthel C Marcus CM Hanson MP Gossard AC 《Physical review letters》2012,108(8):086802
We investigate the scaling of coherence time T(2) with the number of π pulses n(π) in a singlet-triplet spin qubit using Carr-Purcell-Meiboom-Gill (CPMG) and concatenated dynamical decoupling (CDD) pulse sequences. For an even numbers of CPMG pulses, we find a power law T(2) is proportional to (n(π))(γ(e)), with γ(e)=0.72±0.01, essentially independent of the envelope function used to extract T(2). From this surprisingly robust value, a power-law model of the noise spectrum of the environment, S(ω)~ω(-β), yields β=γ(e)/(1-γ(e))=2.6±0.1. Model values for T(2)(n(π)) using β=2.6 for CPMG with both even and odd n(π) up to 32 and CDD orders 3 through 6 compare very well with the experiment. 相似文献
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Wang SY 《Physical review letters》2007,99(22):228901; author reply 228902
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