Coello, JG; Bayat, A; Bose, S; Jefferson, JH; Creffield, CE; (2010) Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot. PHYS REV LETT , 105 (8) , Article 080502. 10.1103/PhysRevLett.105.080502.

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Abstract

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-Lieb-Tasaki 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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