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Probing Entanglement and Non-locality of Electrons in a Double-Dot via Transport and Noise | | Daniel Loss
; Eugene V. Sukhorukov
; | | Date: |
8 Jul 1999 | | Journal: | Phys. Rev. Lett. v.84, 1035 (2000). | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall quant-ph | | Abstract: | Addressing the feasibilty of quantum communication with electrons we consider entangled spin states of electrons in a double-dot which is weakly coupled to in--and outgoing 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 in response to magnetic fields. These oscillations are a genuine two-particle effect and provide a direct measure of non-locality in entangled states. We show that the ratio of zero-frequency noise to current (Fano factor) is universal and equal to the electron charge. | | Source: | arXiv, cond-mat/9907129 | | Services: | Forum | Review | PDF | Favorites | |
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