Mixed-state additivity properties of magic monotones based on quantum relative entropies for single-qubit states and beyond

Abstract

We prove that the stabilizer fidelity is multiplicative for the tensor product of an arbitrary number of single-qubit states. We also show that the relative entropy of magic becomes additive if all the single-qubit states but one belong to a symmetry axis of the stabilizer octahedron. We extend the latter results to include all the $\alpha$-$z$ Rényi relative entropy of magic. This allows us to identify a continuous set of magic monotones that are additive for single-qubit states. We also show that all the monotones mentioned above are additive for several standard two and three-qubit states subject to depolarizing noise. Finally, we obtain closed-form expressions for several states and tighter lower bounds for the overhead of probabilistic one-shot magic state distillation.

v4: Fixed a missing exponent in Section 6, equation 44

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Cited by in corpus (6)

• Magic transition in measurement-only circuits
• A nonstabilizerness monotone from stabilizerness asymmetry
• Efficient witnessing and testing of magic in mixed quantum states
• Black Box Work Extraction and Composite Hypothesis Testing
• Spectral signatures of nonstabilizerness and criticality in infinite matrix product states
• Symmetric channel verification for purifying noisy quantum channels