Detecting entanglement of two-electron spin qubits with witness operators

A. Borras; M. Blaauboer

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Detecting entanglement of two-electron spin qubits with witness operators

机译：用见证算子检测二电子自旋量子位的纠缠

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We propose a scheme for detecting entanglement between two-electron spin qubits in a double quantum dot using an entanglement witness operator. We first calculate the optimal configuration of the two electron spins, defined as the position in the energy level spectrum where, averaged over the nuclear spin distribution, (1) the probability to have two separated electrons and (2) the degree of entanglement of the quantum state quantified by the concurrence are both large. Using a density matrix approach, we then calculate the evolution of the expectation value of the witness operator for the two-spin singlet state, taking into account the effect of decoherence due to quantum charge fluctuations modeled as a boson bath! We find that, for large interdot coupling, it is possible to obtain a highly entangled and robust ground state.

机译：我们提出了一种使用纠缠见证算子检测双量子点中两个电子自旋量子位之间纠缠的方案。我们首先计算两个电子自旋的最佳构型，定义为能级谱中在核自旋分布上平均的位置，（1）具有两个分离的电子的概率，（2）原子的纠缠度通过并发量化的量子态都很大。然后，使用密度矩阵方法，考虑到模拟为玻色子浴的量子电荷涨落引起的退相干效应，我们计算了两次自旋单重态的见证算子期望值的演化！我们发现，对于较大的点间耦合，可以获得高度纠缠且坚固的基态。

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来源
《Physical review》 |2011年第3期|p.033301.1-033301.4|共4页
作者
A. Borras; M. Blaauboer;
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作者单位

Delft University of Technology, Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Lorentzweg 1, NL-2628 CJ Delft, The Netherlands;

Delft University of Technology, Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Lorentzweg 1, NL-2628 CJ Delft, The Netherlands;

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正文语种 eng
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关键词
quantum dots; entanglement production, characterization, and manipulation;

机译：量子点;纠缠产生;表征和操纵;

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1. Minimax optimization of entanglement witness operator for the quantification of three-qubit mixed-state entanglement [J] . Sungguen Ryu, Seung-Sup B. Lee, H.-S. Sim PHYSICAL REVIEW A . 2012,第4期

机译：纠缠见证算子的Minimax优化，用于量化三比特混合态纠缠
2. Minimax optimization of entanglement witness operator for the quantification of three-qubit mixed-state entanglement [J] . Ryu S., Lee S.-S.B., Sim H.-S. Physical Review, A. Atomic, molecular, and optical physics . 2012,第4aPta1期

机译：纠缠见证算子的Minimax优化，用于量化三比特混合态纠缠
3. Detecting some three-qubit MUB diagonal entangled states via nonlinear optimal entanglement witnesses [J] . Jafarizadeh MA, Mahdian M, Heshmati A, The European physical journal, D. Atomic, molecular, and optical physics . 2008,第1期

机译：通过非线性最佳纠缠见证人检测一些三比特MUB对角纠缠态
4. Simple Experimental Generation of a Four-Photon Cluster State and Distinguishing Classes of Genuine Four-Qubit Entanglement Using Witness Operators [C] . Yuuki Tokunaga, Shin Kuwashiro, Takashi Yamamoto, Quantum Electronics and Laser Science Conference . 2007

机译：使用证人运算符的简单实验生成四光子簇状态和凝固正版四态纠缠的类别
5. Manipulation and coherence of a two-electron logical spin qubit using gallium arsenide double quantum dots. [D] . Foletti, Sandra Elisabetta. 2010

机译：使用砷化镓双量子点的双电子逻辑自旋量子位的操纵和相干性。
6. Witnessing entanglement without entanglement witness operators [O] . Luca Pezzè, Yan Li, Weidong Li, 2016

机译：在没有纠缠证人的情况下见证纠缠
7. Detecting entanglement of two-electron spin qubits with witness operators [O] . Borras, A., Blaauboer, M. 2011

机译：用见证算子检测二电子自旋量子位的纠缠
8. Quantum Entanglement of Quantum Dot Spin Using Flying Qubits. [R] . Steel, D. G. 2015

机译：用飞行量子点量子点旋转的量子纠缠。

Detecting entanglement of two-electron spin qubits with witness operators

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