Complete disentanglement by partial pure dephasing (6 pages)

Yang Yang, Qing Qing, Ming Ming +2 more

Jun‐Qi Li, J.-Q. Liang

Katarzyna Roszak, Paweł Machnikowski

We study the effect of pure dephasing on the entanglement of a pair of two-level subsystems (qubits). We show that partial dephasing induced by a super-Ohmic reservoir, corresponding to well-established properties of confined charge states and phonons in semiconductors, may lead to complete disentanglement. We show also that the disentanglement effect increases with growing distance between the two subsystems.

Robert W. O'Connell

F. Guinea, Tobias Stauber

Katarzyna Roszak, Paweł Machnikowski, Lucjan Jacak

The study of the effect that pure dephasing has on the entanglement of a pair of two-level systems shows that complete disentanglement may be caused by partial pure dephasing for some initial entangled states. We examine the behaviour of the entanglement of two confined charge states under the influence of partial pure dephasing introduced by a super-Ohmic reservoir (typical for semiconductors). We classify the set of completely dephasible states and provide an explanation of this effect.