High-Efficiency Cooper-Pair Splitter in Quantum Anomalous Hall Insulator Proximity-Coupled with Superconductor

Abstract

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.

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Cited by in corpus (9)

• Crossed Andreev effects in two-dimensional quantum Hall systems
• Spin-filtered and Spatially Distinguishable Crossed Andreev Reflection in a Silicene-Superconductor Junction
• The influence of anti-chiral edge states on Andreev reflection in graphene-superconductor junction
• Chiral Majorana fermion modes regulated by a scanning tunneling microscope tip
• Manipulation of Cooper pair entanglement in hybrid topological Josephson junctions
• Electron waiting times in hybrid junctions with topological superconductors
• Andreev reflection in a Y-shaped graphene-superconductor device
• Topological phase transition driven by magnetic field in one-dimensional topological superconductor rings
• Long-range Cooper pair splitting by chiral Majorana edge states