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Decoherence by coupling to an environment is the main element determining the feasibility of quantum information storage, encoding, and computing. In numerous current theoretical proposals, the irreversibility of decoherence processes is faced with two generic means. One is the filtering out of the ensemble portion that has not decohered, which has been suggested for two-mode fields in Ref. 1 The other means is encoding the state (qubit) by means of several ancillas, decoding the result after a certain time, checking the anciilas for error syndromes, and correcting them.2
© 1997 Optical Society of America
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