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The major contribution to decoherence of a double quantum dot or a Josephsonjunction charge qubit comes from the electrostatic coupling to fluctuatingbackground charges hybridized with the conduction electrons in the reservoir.However, estimations according to previously developed theories show thatfinding a sufficient number of effective fluctuators in a realisticexperimental layout is quite improbable. We show that this paradox is resolvedby allowing for a short-range Coulomb interaction of the fluctuators with theelectrons in the reservoir. This dramatically enhances both the number ofeffective fluctuators and their contribution to decoherence, resulting in themost dangerous decoherence mechanism for charge qubits.

Decoherence of charge qubit coupled to interacting background charges