Sample-Optimal Quantum Process Tomography with non-adaptive Incoherent Measurements
Résumé
How many copies of a quantum process are necessary and sufficient to construct an approximate classical description of it? We extend the result of Surawy-Stepney, Kahn, Kueng, and Guta (2022) to show that Õ(d^6 /\epsilon^2) copies are sufficient to learn a d-dimensional quantum channel to within ε in the diamond norm. Moreover, we show that Ω(d^6 /\epsilon^2) copies are necessary for any strategy using incoherent non-adaptive measurements. This lower bound applies even for ancilla-assisted strategies.
Domaines
Physique Quantique [quant-ph]Origine | Fichiers produits par l'(les) auteur(s) |
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