Optimal Eavesdropping in Quantum Cryptography. II. Quantum Circuit
Robert B. Griffiths, Chi-Sheng Niu
Abstract
It is shown that the optimum strategy of the eavesdropper, as described in the preceding paper, can be expressed in terms of a quantum circuit in a way which makes it obvious why certain parameters take on particular values, and why obtaining information in one basis gives rise to noise in the conjugate basis.
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