Bodoky F, Gühne O, Blaauboer M
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
J Phys Condens Matter. 2009 Sep 30;21(39):395602. doi: 10.1088/0953-8984/21/39/395602. Epub 2009 Sep 1.
We investigate the time evolution of entanglement under various models of decoherence: a general heuristic model based on local relaxation and dephasing times, and two microscopic models describing decoherence of electron spin qubits in quantum dots due to the hyperfine interaction with the nuclei. For each of the decoherence models, we investigate and compare how long the entanglement can be detected. We also introduce filtered witness operators, which extend the available detection time and investigate this detection time for various multipartite entangled states. By comparing the time required for detection with the time required for generation and manipulation of entanglement, we estimate for a range of different entangled states how many qubits can be entangled in a one-dimensional array of electron spin qubits.
一种基于局部弛豫和退相时间的通用启发式模型，以及两种描述量子点中电子自旋量子比特由于与原子核的超精细相互作用而产生退相干的微观模型。对于每种退相干模型，我们研究并比较了能够检测到纠缠的时长。我们还引入了滤波见证算符，它延长了可用的检测时间，并针对各种多体纠缠态研究了此检测时间。通过将检测所需时间与纠缠生成和操纵所需时间进行比较，我们针对一系列不同的纠缠态估计了在一维电子自旋量子比特阵列中可以纠缠多少个量子比特。
