| I. L. Chuang, R. La amme, P. Shor, and W. H. Zurek, Science 270, 1633 (1995). |
....for obtaining. The interesting observation is that this black box may be an attempt to realize a useful quantum device. For example, it may be a quantum cryptography channel[1, 2] which might include an eavesdropper ) a quantum computer in which decoherence occurs, limiting its performance[3, 4], or just an imperfect quantum logic gate[5, 6] whose performance you wish to characterize to determine its usefulness. How many parameters are necessary to describe a quantum black box acting on an input with a state space of N dimensions And how may these parameters be experimentally ....
I. L. Chuang, R. La amme, P. Shor, and W. H. Zurek, Science 270, 1633 (1995).
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