Quantum entanglement via two-qubit quantum Zeno dynamics

We study the two-particle quantum Zeno dynamics with a type of nondeterministic collective measurement whose outcome indicates whether the two-particle state has been collapsed to 11⟩. Such a threshold detection, when used continuously, can lead to nontrivial quantum dynamics. We show that such type of dynamics can be used to produce quantum entanglement almost deterministically. We then numerically show the robustness of the method and we find that the operational errors of the small-angle rotations do not accumulate. We also propose a possible implementation using superconducting flux qubits.