Probing entanglement and nonlocality of electrons in a double-dot via transport and noise.
Probing entanglement and nonlocality of electrons in a double-dot via transport and noise.
复制标题
DOI：
10.1103/physrevlett.84.1035
复制
发表时间：
1999-07
影响因子：
8.6
通讯作者：
D. Loss;E. Sukhorukov
中科院分区：
文献类型：
--
作者：
D. Loss;E. Sukhorukov
为了解决与电子进行量子通信的可行性，我们考虑了与引线弱耦合的双点中电子的纠缠自旋态。我们证明了在介观输运和噪声测量中可以检测到双量子点中两个电子的纠缠。在库仑阻塞和cotunneling制度的单线态和三线态导致相位相干电流和噪声的贡献相反的符号和Aharonov-Bohm和Berry相位振荡。这些振荡是真正的两粒子效应，并提供了纠缠态非定域性的直接测量。我们证明了零频噪声与电流的比值等于电子电荷。
Addressing the feasibility of quantum communication with electrons we consider entangled spin states of electrons in a double-dot which is weakly coupled to leads. We show that the entanglement of two electrons in the double-dot can be detected in mesoscopic transport and noise measurements. In the Coulomb blockade and cotunneling regime the singlet and triplet states lead to phase-coherent current and noise contributions of opposite signs and to Aharonov-Bohm and Berry phase oscillations. These oscillations are a genuine two-particle effect and provide a direct measure of nonlocality in entangled states. We show that the ratio of zero-frequency noise to current is equal to the electron charge.