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arXiv quant-ph/0507177quant-ph
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一般环境下的非马尔可夫量子动力学解耦差错威慑

Non-Markovian Quantum Error Deterrence by Dynamical Decoupling in a General Environment

K. Shiokawa, B. L. Hu

摘要:

研究了一种动态解耦方案,用于阻止非马尔可夫(通常对应于低温、短时间和强耦合)机制中的错误,该机制适用于由多级结构构造的量子比特。我们采用最近提出的有效自旋玻色子模型[K.盐川和B. L. Hu,Phys.Rev.A70,062106(2004)]作为量子布朗振子模型的低温极限,其中可以获得具有色噪声的一般环境的精确解。在我们的解耦方案中,一个训练的强脉冲对被用来发展的相互作用哈密顿量瞬间。使用此方案,我们表明,动态解耦方法可以抑制$1/f$噪声与更慢,因此更容易访问的脉冲比以前的研究,但它仍然未能解耦超欧姆类型的环境。

英文摘要:

A dynamical decoupling scheme for the deterrence of errors in the non-Markovian (usually corresponding to low temperature, short time, and strong coupling) regimes suitable for qubits constructed out of a multilevel structure is studied. We use the effective spin-boson model (ESBM) introduced recently [K. Shiokawa and B. L. Hu, Phys. Rev. A70, 062106 (2004)] as a low temperature limit of the quantum Brownian oscillator model, where one can obtain exact solutions for a general environment with colored noises. In our decoupling scheme a train of pairs of strong pulses are used to evolve the interaction Hamiltonian instantaneously. Using this scheme we show that the dynamical decoupling method can suppress $1/f$ noise with slower and hence more accessible pulses than previously studied, but it still fails to decouple super-Ohmic types of environments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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