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Protecting two-qubit quantum states by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>π</mml:mi></mml:mrow></mml:math>-phase pulses
We study the state decay of two qubits interacting with a common harmonic oscillator reservoir. We find both a decoherence error and the error caused by the amplitude change of the superradiant state. We show that frequent $\ensuremath{\pi}$-phase pulses can eliminate both types of errors and therefore protect a two-qubit …