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Probabilistic Cloning
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==Properties== '''Success Probability Claims'''</br> *'''General case:''' The success probability for cloning the elements of the input set of linearly independent states satisfies the following matrix relation:</br> <math>X^{(1)} = \sqrt{P}X^{(2)}\sqrt{P^{\dagger}} + CC^{\dagger}</math></br></br> where <math>\sqrt{P} = \sqrt{P^{\dagger}} = diag(\sqrt{p_1}, .... \sqrt{p_n})</math>,</br> <math>X^{(k)} = \langle\psi_i|\psi_j\rangle^k</math>, </br> and <math>C = [c_{ij}]</math> *'''Two qubits case:''' The optimal success probability for the probabilistic machine which is able to clone two non-orthogonal qubits is:</br> <math>p = \frac{1}{1 + cos2\eta}</math>
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