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International Journal of Theoretical Physics

, Volume 51, Issue 9, pp 2930–2942 | Cite as

A Direct Measurement Scheme of Two Quantum-Dot Qubits Quantum Correlation via Detector Current

  • Bao Liu
  • Jie Song
  • He-Shan Song
Article
  • 127 Downloads

Abstract

By using the rate equation method we have investigated a scheme for measuring the quantum discord between two double quantum dot qubits via the current in quantum point-contact devices. The current of the detectors is same in-phase as the time-dependant of the quantum discord, and we can read out the most important time point when the quantum discord or quantum correlation reaches its maximum or minimum. Furthermore, in a special initial condition, the current can reflect the quantum discord. The shot noise of the detectors is calculated numerically. Which is dominated by the measured signal in single shot experiments.

Keywords

Quantum dots Quantum discord Entanglement Quantum point-contact device Shot noise X-state 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China under grants No. 10875020. We thank Dr. L. Zhou, Dr. S.L. Wu and Dr. H.D. Liu for useful discussions. And we thank for Dr. J. Liu and Dr. Z.T. Jiang, and B. Shao for their instructive work in QPC [13].

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.School of Physics and Optoelectronic TechnologyDalian University of TechnologyDalianChina
  2. 2.Department of PhysicsHarbin Institute of TechnologyHarbinChina

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