Telegraph noise effects on two charge qubits in double quantum dots

Abstract

We analyze theoretically the decoherence of two interacting electrons in a double self-assembled quantum dot due to a random telegraph noise. For this purpose we have examined the pure dephasing rate by evaluating the decoherence factor. This latter has been shown to be different from that calculated within the Gaussian approximation in the strong coupling regime. In order to determine the influence of the random telegraph noise on the entanglement of the system states, the concurrence, the populations and the entropy are evaluated as well. Our results show that telegraph noise can severely impact the coherence of charges qubits.