title: Electron entanglement detected by quantum spin Hall systems.
abstract: We propose a promising electron entanglement detector consisting of two quantum spin Hall systems weakly coupled to a superconductor. The detection of electron spins along various polarization directions, which is a prerequisite for testing Bell's inequality on solid state spins, can be achieved in an all-electrical-controlled manner utilizing the helical edge states. It is found that the violation of Bell's inequality exists in a large range of the tunneling parameters, which can be realized in mercury telluride quantum wells.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Shen
authors.forename: L
authors.initials: L
authors.lastname: Sheng
authors.forename: B G
authors.initials: BG
authors.lastname: Wang
authors.forename: D Y
authors.initials: DY
authors.lastname: Xing