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We study the state decay of two qubits interacted with a common harmonicoscillator reservoir. There are both decoherence error and the error caused bythe amplitude change of the superradiant state. We show that frequent$\pi$-phase pulses can eliminate both typpes of errors therefore protect atwo-qubit odd-parity state more effectively than the frequent measurementmethod. This shows that the the methods using dynamical decoupling and thequantum Zeno effects actually can give rather {\em different} results when theoperation frequency is finite.

Protecting Two-Qubit Quantum States by $\pi$-Phase Pulses