Interference and Switching of Josephson current carried by nonlocal spin-entangled electrons in a SQUID-like system with quantum dots

Abstract

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.

4 pages, 4 figures; to appear in Phys. Rev. Lett

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• Nonlocal Andreev transport through a quantum dot in a magnetic field: Interplay between Kondo, Zeeman, and Cooper-pair correlations
• Suppressed Josephson phase transition in one parallel double-quantum-dot junction
• Aharonov-Bohm and Aharonov-Casher effects in double quantum dot Josephson junction
• Cooper pair splitting in ballistic ferromagnetic SQUIDs
• Superconducting Diode Effect in Double Quantum Dot Device
• Cooper-pair splitters as circuit elements for realizing topological superconductors