2007/01/21 by Wenxian Zhang, V. V. Dobrovitski, Lea F. Santos +2
Physics and Astronomy · #Coherence (philosophical gambling strategy) #Computational physics #Condensed matter physics #Decoupling (probability) #Dynamical decoupling #Electron #Physics #Quantum #Quantum and electron transport phenomena #Quantum decoherence #Quantum dot #Quantum mechanics #Quantum optics and atomic interactions #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Statistical physics #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.75.201302
published as Phys. Rev. B 75, 201302(R) (2007). · 4 pages, 4 figures with 3 of them in color
arxiv created 2007/01/21 · openalex publication_date 2007/05/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the performance of dynamical decoupling methods at suppressing electron spin decoherence from a low-temperature nuclear spin reservoir in a quantum dot. The controlled dynamics is studied through exact numerical simulation, with emphasis on realistic pulse delays and the long-time limit. Our results show that optimal performance for this system is attained by a periodic protocol exploiting concatenated design, with control rates substantially slower than expected from the upper spectral cutoff of the bath. For a known initial electron spin state, coherence can saturate at long times, signaling the creation of a stable ``spin-locked'' decoherence-free subspace. Analytical insight into saturation is obtained for a simple echo protocol, in good agreement with numerical results.