Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot

Details Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot

2010-03-03

arxiv.org/abs/1003.0909v2

Phys. Rev. Lett. 105, 080502 (2010)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.105.080502 1

We exploit the non-dissipative 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 AKLT 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 choice of dot-size and initialization errors, as well as decoherence introduced by the hyperfine interaction.

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