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arXiv 1006.2013quant-phcond-mat.stat-mech
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通过测量三个互补观测量监测量子比特状态

Qubit state monitoring by measurement of three complementary observables

Rusko Ruskov, Alexander N. Korotkov, Klaus Mølmer

摘要:

我们考虑了自旋为1/2的量子比特在三个非对易量子比特算符sigma_x,sigma_y,sigma_z同时连续测量下的演化。对于相同的理想检测器,量子比特状态通过在布洛赫向量空间中以随机方向接近纯态并通过在垂直方向上进行局部各向同性扩散而演化。以完整检测器记录为条件的量子态用于评估基于运行时间平均值和离散时间仓检测器输出的经典启发估计的保真度。

英文摘要:

We consider the evolution of a spin 1/2 (qubit) under the simultaneous continuous measurement of three non-commuting qubit operators sigma_x, sigma_y, sigma_z. For identical ideal detectors the qubit state evolves by approaching a pure state with a random direction in the Bloch vector space and by undergoing locally isotropic diffusion in the perpendicular directions. The quantum state conditioned on the complete detector record is used to assess the fidelity of classically inspired estimates based on running time averages and discrete time bin detector outputs.

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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