Systematic errors in current quantum state tomography tools
Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or least squares optimization to obtain physical estimates for the quantum state, we observe a systematic underestimation of...
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| Veröffentlicht in: | Physical review letters 2015-02, Vol.114 (8), p.080403-080403, Article 080403 |
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| container_end_page | 080403 |
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| container_issue | 8 |
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| container_title | Physical review letters |
| container_volume | 114 |
| creator | Schwemmer, Christian Knips, Lukas Richart, Daniel Weinfurter, Harald Moroder, Tobias Kleinmann, Matthias Gühne, Otfried |
| description | Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or least squares optimization to obtain physical estimates for the quantum state, we observe a systematic underestimation of the fidelity and an overestimation of entanglement. Such strongly biased estimates can be avoided using linear evaluation of the data or by linearizing measurement operators yielding reliable and computational simple error bounds. |
| doi_str_mv | 10.1103/physrevlett.114.080403 |
| format | Article |
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| ispartof | Physical review letters, 2015-02, Vol.114 (8), p.080403-080403, Article 080403 |
| issn | 0031-9007 1079-7114 |
| language | eng |
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| source | American Physical Society Journals |
| subjects | Density Error analysis Estimates Least squares method Operators Optimization Systematic errors Tomography |
| title | Systematic errors in current quantum state tomography tools |
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