Spin filtering and entanglement swapping through coherent evolution of a single quantum dot



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Garcia Coello, José and Bayat, Abolfazl and Bose, Sougato and Jefferson, John H and Creffield, Charles E. (2010) Spin filtering and entanglement swapping through coherent evolution of a single quantum dot. Physical review letters, 105 (8). ISSN 0031-9007

[thumbnail of Creffield C 05 LIBRE.pdf]

Official URL: http://dx.doi.org/10.1103/PhysRevLett.105.080502


We exploit the nondissipative dynamics of a pair of electrons in a large square quantum dot to perform singlet-triplet spin measurement through a single charge detection and show how this may be used for entanglement swapping and teleportation. The method is also used to generate the Affleck-Kennedy-LiebTasaki ground state, a further resource for quantum computation. We justify, and derive analytic results for, an effective charge-spin Hamiltonian which is valid over a wide range of parameters and agrees well with exact numerical results of a realistic effective-mass model. Our analysis also indicates that the method is robust to the choice of dot-size and initialization errors, as well as decoherence.

Item Type:Article
Additional Information:

©2010 The American Physical Society.
A. B. and S. B. are supported by the EPSRC. J. G. C. was supported by the QIPIRC. S. B. acknowledges the Royal Society and the Wolfson Foundation. C. E. C. was supported by the MICINN (Spain) through Grant No. FIS- 2007-65723, and the Ramón y Cajal Program. J. H. J. acknowledges support from the UK Ministry of Defence.

Uncontrolled Keywords:Physics, Multidisciplinary
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:32951
Deposited On:28 Aug 2015 10:52
Last Modified:21 Jun 2022 17:18

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