Phys. Rev. B 74, 241305(R) (2006) [4 pages]Spin qubits in double quantum dots: Entanglement versus the Kondo effect
We investigate the competition between pair entanglement of two spin qubits in double quantum dots attached to leads with various topologies and the separate entanglement of each spin with nearby electrodes. Universal behavior of entanglement is demonstrated in dependence on the mutual interactions between the spin qubits, the coupling to their environment, temperature, and magnetic field. As a consequence of quantum phase transition an abrupt switch between fully entangled and unentangled states takes place when the dots are coupled in parallel. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.241305
DOI:
10.1103/PhysRevB.74.241305
PACS:
73.63.Kv, 03.67.Mn, 72.15.Qm
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.