Optimal cloning of qubits given by an arbitrary axisymmetric distribution on the Bloch sphere
Optimal cloning of qubits given by an arbitrary axisymmetric distribution on the Bloch sphere
We find an optimal quantum cloning machine, which clones qubits of arbitrary symmetrical distribution around the Bloch vector with the highest fidelity. The process is referred to as phase-independent cloning in contrast to the standard phase-covariant cloning for which an input qubit state is a priori better known. We assume …