%0 Journal Article
%A Garcia Coello, José
%A Bayat, Abolfazl
%A Bose, Sougato
%A Jefferson, John H
%A Creffield, Charles
%T Spin filtering and entanglement swapping through coherent evolution of a single quantum dot
%D 2010
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/44732
%X 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.
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