Entanglement Detection by Current Measurements in Double Quantum Dot System
P. Busz, P. Rożek, D. Tomaszewski and J. Martinek
Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznań, Poland
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The development of quantum computing in quantum dots systems requires highly efficient and continuous solid-state source of spatially separated spin-entangled electrons. One of the approaches is a use of double quantum dot system connected to superconducting lead, where Cooper pairs provide a source of naturally entangled electrons. Apart from the source, an useful tool for detection of quantum entanglement is needed. We present entanglement detection by the ferromagnetic electrodes using entanglement witness operator method and direct measurement of spin polarized current in the system. We investigate requirements that have to be fulfilled by ferromagnetic detectors.

DOI: 10.12693/APhysPolA.127.490
PACS numbers: 03.67.Mn, 03.67.Bg, 73.23.-b