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2015 ; 5
(ä): 14892
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High-Efficiency Cooper-Pair Splitter in Quantum Anomalous Hall Insulator
Proximity-Coupled with Superconductor
#MMPMID26450824
Zhang YT
; Deng X
; Sun QF
; Qiao Z
Sci Rep
2015[Oct]; 5
(ä): 14892
PMID26450824
show ga
The quantum entanglement between two qubits is crucial for applications in the
quantum communication. After the entanglement of photons was experimentally
realized, much effort has been taken to exploit the entangled electrons in
solid-state systems. Here, we propose a Cooper-pair splitter, which can generate
spatially-separated but entangled electrons, in a quantum anomalous Hall
insulator proximity-coupled with a superconductor. After coupling with a
superconductor, the chiral edge states of the quantum anomalous Hall insulator
can still survive, making the backscattering impossible. Thus, the local Andreev
reflection becomes vanishing, while the crossed Andreev reflection becomes
dominant in the scattering process. This indicates that our device can serve as
an extremely high-efficiency Cooper-pair splitter. Furthermore, because of the
chiral characteristic, our Cooper-pair splitter is robust against disorders and
can work in a wide range of system parameters. Particularly, it can still
function even if the system length exceeds the superconducting coherence length.