Current noise cross correlations and dynamical spin entanglement in coupled quantum dots

  • Authors:

  • Hai-Feng Lü;Yong Guo;Lian-Fu Wei

  • Affiliations:

  • Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu, China;Department of Physics and State Key Laboratory of Low-dimensional Quantum Physics, Tsinghua University, Beijing, China;Quantum Optoelectronics Laboratory, Southwest Jiaotong University, Chengdu, China

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2011

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Abstract

The authors investigate current noise cross correlations (CCs) through coupled double quantum dots under transport conditions. It is demonstrated that positive CCs relate to either thermal fluctuations at nonzero temperature or quantum tunneling processes at zero temperature. These measurable CCs could service as the sensitive indicators of entanglements between electronic spins in double dots coupled by exchange interactions.