Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-30
Phys. Rev. Lett. 106, 037002 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures; to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.106.037002
Josephson current of spin-entangled electrons through the two branches of a SQUID-like structure with two quantum dots exhibits a magnetic-flux response different from the conventional Josephson current. Due to their interference, the period of maximum Josephson current changes from $h/2e$ to $h/e$, which can be used for detecting the Cooper-pair splitting efficiency. The nonlocal spin entanglement provides a quantum mechanical functionale for switching on and off this novel Josephson current, and explicitly a switch is formulated by including a pilot junction. It is shown that the device can be used to measure the magnitude of split-tunneling Josephson current.
Hu Xiao
Wang Zhi
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