Spin filtering and entanglement swapping through coherent evolution of a single quantum dot
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...
| Authors: | , , , , |
|---|---|
| Format: | article |
| Publication Date: | 2010 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/44732 |
| Online Access: | https://hdl.handle.net/20.500.14352/44732 |
| Access Level: | Open access |
| Keyword: | 538.9 Physics Multidisciplinary Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Summary: | 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. |
|---|