Quantum signal splitting that avoids initialization of the targets

Details Quantum signal splitting that avoids initialization of the targets Quantum signal splitting that avoids initialization of the targets

1996-09-16

arxiv.org/abs/quant-ph/9609010v2

Modern Phys. Lett. B 11 (1997) 1277-1283

Physics

Quantum Physics

16 pages in plain TeX and one Postscript figure

Scientific paper

10.1142/S0217984997001523

The classical signal splitting and copying are not possible in quantum mechanics. Specifically, one cannot copy the basis up and down states of the input (I) two-state system (qubit, spin) into the copy (C) and duplicate-copy (D) two-state systems if the latter systems are initially in an arbitrary state. We consider instead a quantum evolution in which the basis states of I at time t are duplicated in at least two of the systems I, C, D, at time t + Delta t. In essence, the restriction on the initial target states is exchanged for uncertainty as to which two of the three qubits retain copies of the initial source state.

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