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A simple optical model to realize a reversible, potentially error-free logic gate---a Fredkin gate---is discussed. The device dissipates no energy and makes use of the Kerr nonlinearity to produce intensity-dependent phase shifts. The analysis shows that quantum mechanics permits the operation of error-free logic gates which dissipate no energy. However, even though the device is nondissipative, error-free performance only occurs under particular operating conditions.
G. J. Milburn (Mon,) studied this question.
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