Garcia Coello, JoséBayat, AbolfazlBose, SougatoJefferson, John HCreffield, Charles2023-06-202023-06-202010-08-170031-900710.1103/PhysRevLett.105.080502https://hdl.handle.net/20.500.14352/44732©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.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.engjournal articlehttp://dx.doi.org/10.1103/PhysRevLett.105.080502http://journals.aps.orgopen access538.9PhysicsMultidisciplinaryFísica de materialesFísica del estado sólido2211 Física del Estado Sólido