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- W2921722384 abstract "We argue that the optimization of a quantum process based on the customarily used fidelity between the actual and the expected outputs may not be sufficient. We introduce a quantity namely the “quantum process randomness”, which is the standard deviation of the distribution of Born probabilities corresponding to the orthonormal measurement that projects the expected output onto the eigenstates of the actual output, and obtain a trade-off between fidelity and randomness for an arbitrary quantum process. We consider approximate quantum cloning and teleportation processes to illustrate the concept. We find that the optimal approximate universal and state-dependent quantum cloning machines obtained by maximizing the fidelity is the same as that obtained by optimizing the difference between randomness and fidelity." @default.
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- W2921722384 date "2021-01-01" @default.
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- W2921722384 title "Quantum process randomness" @default.
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- W2921722384 doi "https://doi.org/10.1016/j.physleta.2020.127024" @default.
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