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Quantum Cloning and Distributed Measurements

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arxiv quant-ph/0011073 v1 pith:DYQ5RSMC submitted 2000-11-16 quant-ph

Quantum Cloning and Distributed Measurements

classification quant-ph
keywords measurementsoutputinputcloningeffectiveoriginalsharpadditionally
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study measurements on various subsystems of the output of a universal 1 to 2 cloning machine, and establish a correspondence between these measurements at the output and effective measurements on the original input. We show that one can implement sharp effective measurement elements by measuring only two out of the three output systems. Additionally, certain complete sets of sharp measurements on the input can be realised by measurements on the two clones. Furthermore, we introduce a scheme that allows to restore the original input in one of the output bits, by using measurements and classical communication -- a protocol that resembles teleportation.

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