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research article

Reconstruction of quantum states by applying an analytical optimization model

Prasad, Rohit
•
Ghosh, Pratyay  
•
Thomale, Ronny
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February 1, 2025
Physical Review A

When working with quantum states, analysis of the final quantum state generated through probabilistic measurements is essential. This analysis is typically conducted by constructing the density matrix from either partial or full tomography measurements of the quantum state. While full tomography measurement offers the most accurate reconstruction of the density matrix, limited measurements pose challenges for reconstruction algorithms, often resulting in nonphysical density matrices with negative eigenvalues. This is often remedied using maximum likelihood estimators, which have a high computing time or by other estimation methods that decrease the reconstructed fidelity. In this paper, we show that when restricting the measurement sample size, improvement over existing algorithms can be achieved. Our findings underline the multiplicity of solutions in the reconstruction problem, depending upon the generated state and measurement model utilized, thus motivating further research towards identifying optimal algorithms tailored to specific experimental contexts.

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Type
research article
DOI
10.1103/PhysRevA.111.022601
Scopus ID

2-s2.0-85217535843

Author(s)
Prasad, Rohit

Julius-Maximilians-Universität Würzburg

Ghosh, Pratyay  

École Polytechnique Fédérale de Lausanne

Thomale, Ronny

Julius-Maximilians-Universität Würzburg

Huber-Loyola, Tobias

Julius-Maximilians-Universität Würzburg

Date Issued

2025-02-01

Published in
Physical Review A
Volume

111

Issue

2

Article Number

022601

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CTMC  
Available on Infoscience
February 19, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/247083
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