Pauli transfer matrix direct reconstruction: channel characterization without full process tomography

We present a tomographic protocol for the characterization of multiqubit quantum channels. We discuss a specific class of input states, for which the set of Pauli measurements at the output of the channel directly relates to its Pauli transfer matrix components. We compare our results to those of st...

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Bibliographic Details
Published in:arXiv.org 2023-10
Main Authors: Roncallo, Simone, Maccone, Lorenzo, Macchiavello, Chiara
Format: Article
Language:English
Subjects:
Knowledge management
Qubits (quantum computing)
Tomography
Transfer matrices
Online Access:Get full text
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Summary:We present a tomographic protocol for the characterization of multiqubit quantum channels. We discuss a specific class of input states, for which the set of Pauli measurements at the output of the channel directly relates to its Pauli transfer matrix components. We compare our results to those of standard quantum process tomography, showing an exponential reduction in the number of different experimental configurations required by a single matrix element extraction, while keeping the same number of shots. This paves the way for more efficient experimental implementations, whenever a selective knowledge of the Pauli transfer matrix is needed. We provide several examples and simulations.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.11968