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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Electron entanglement detected by quantum spin Hall systems.

Wei Chen¹, R Shen, L Sheng

¹National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.

Physical Review Letters

|August 7, 2012

Summary

We developed an all-electrical detector for electron entanglement using quantum spin Hall systems. This device enables testing Bell's inequality for solid-state spins, with violations observed in mercury telluride quantum wells.

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Area of Science:

Condensed matter physics
Quantum information science

Background:

Testing fundamental quantum mechanics principles like Bell's inequality is crucial.
Solid-state systems offer a scalable platform for quantum information processing.

Purpose of the Study:

To propose and theoretically investigate a novel electron entanglement detector.
To enable all-electrical control and detection of electron spins for Bell's inequality tests.

Main Methods:

Utilizing two coupled quantum spin Hall (QSH) systems and a superconductor.
Leveraging helical edge states in QSH systems for spin detection.
Analyzing the violation of Bell's inequality under varying tunneling parameters.

Main Results:

Demonstrated an all-electrical method for detecting electron spins along arbitrary directions.
Confirmed the violation of Bell's inequality over a broad range of tunneling parameters.
Identified mercury telluride quantum wells as a viable material system for realization.

Conclusions:

The proposed detector provides a promising route for solid-state Bell tests.
The all-electrical control offers practical advantages for quantum information applications.
Experimental realization in mercury telluride quantum wells is feasible.