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Using the method developed by Gurvitz of solving Schrdinger equations and the numerical calculation, we investigate the oscillation and the entanglement of the two opposite-spin electrons in coupled quantum dots, and show how to read out the entanglement by quantum point-contact detector. The results show that the two electrons start to entangle due to Coulomb interaction, and then they move together with Coulomb interaction augmenting, similar to the oscillation of an electron in a qibit. In this case, we locate a quantum point contact detector near one of the quantum dots, and the entanglement information can be obtained by changing the current.
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Keywords:
- Coulomb interaction /
- entanglement /
- measurement /
- current change rate
[1] Jiang Z T, Yang J, Han Q Z 2008 J.Phys.Condens 20 075210
[2] Gurvitz S A 2005 Phys.Rev.B 72 073303
[3] Gilad T, Gurvitz S A 2006 Phys.Rev.Lett 97 116806
[4] Huang X S, Xie S Y, Yang Y P 2006 Acta Phys.Sin.55 2269 (in Chinese) [黄仙山、谢双媛、羊亚平 2006 物理学报55 2269]
[5] Hu X N, Li X Q 2006 Acta Phys.Sin.55 3259 (in Chinese) [胡学宁、李新奇 2006 物理学报55 3259]
[6] Jiao H J, Li X Q 2007 Phys.Rev.B 75 155333.
[7] Elzerman J M, Nanson R, Willems van Beveren L M, Witkamp B, Vandersypen L M K, Kouwenhoven L P 2004 Nature 430 431
[8] Wootters W K 1998 Phys.Rev.Lett 80 2245
[9] Liu J, Jiang Z T, Shao B 2009 Phys.Rev.B 79 115323
[10] Gurvitz S A 1997 Phys.Rev.B 56 15215
[11] Gurvitz S A 2000 Phys.Rev.Lett 85 812
[12] Zhang Y P, Gao Y F, Liang J Q Phys Lett A 346 115
[13] Liu S D, Cheng M T, Zhou H J, Li Y Y, Wang Q Q, Xue Q K 2006 Acta Phys.Sin.55 2122 (in Chinese) [刘绍鼎、程木田、周慧君、李耀义、王取泉、薛其坤 2006 物理学报55 2122]
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[1] Jiang Z T, Yang J, Han Q Z 2008 J.Phys.Condens 20 075210
[2] Gurvitz S A 2005 Phys.Rev.B 72 073303
[3] Gilad T, Gurvitz S A 2006 Phys.Rev.Lett 97 116806
[4] Huang X S, Xie S Y, Yang Y P 2006 Acta Phys.Sin.55 2269 (in Chinese) [黄仙山、谢双媛、羊亚平 2006 物理学报55 2269]
[5] Hu X N, Li X Q 2006 Acta Phys.Sin.55 3259 (in Chinese) [胡学宁、李新奇 2006 物理学报55 3259]
[6] Jiao H J, Li X Q 2007 Phys.Rev.B 75 155333.
[7] Elzerman J M, Nanson R, Willems van Beveren L M, Witkamp B, Vandersypen L M K, Kouwenhoven L P 2004 Nature 430 431
[8] Wootters W K 1998 Phys.Rev.Lett 80 2245
[9] Liu J, Jiang Z T, Shao B 2009 Phys.Rev.B 79 115323
[10] Gurvitz S A 1997 Phys.Rev.B 56 15215
[11] Gurvitz S A 2000 Phys.Rev.Lett 85 812
[12] Zhang Y P, Gao Y F, Liang J Q Phys Lett A 346 115
[13] Liu S D, Cheng M T, Zhou H J, Li Y Y, Wang Q Q, Xue Q K 2006 Acta Phys.Sin.55 2122 (in Chinese) [刘绍鼎、程木田、周慧君、李耀义、王取泉、薛其坤 2006 物理学报55 2122]
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