Training iterated protocols for distillation of GHZ states with variational quantum algorithms
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866917596743335936 |
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| author | Rozgonyi, Áron Széchenyi, Gábor Kálmán, Orsolya Kiss, Tamás |
| author_facet | Rozgonyi, Áron Széchenyi, Gábor Kálmán, Orsolya Kiss, Tamás |
| contents | We present optimized distillation schemes for preparing Greenberger-Horne-Zeilinger (GHZ) states. Our approach relies on training variational quantum circuits with white noise affected GHZ states as inputs. Optimizing for a single iteration of the scheme, we find that it is possible to achieve an increased fidelity to the GHZ state, although further iterations decrease the fidelity. The same scheme, acting on coherently distorted pure-state inputs, is effective only in certain special cases. We show that radically different results can be achieved, however, when one optimizes for the output after two iterations of the protocol. In this case, the obtained schemes are more effective in distilling GHZ states from inputs affected by white noise. Moreover, they can also correct several types of coherent pure-state errors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_04646 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Training iterated protocols for distillation of GHZ states with variational quantum algorithms Rozgonyi, Áron Széchenyi, Gábor Kálmán, Orsolya Kiss, Tamás Quantum Physics We present optimized distillation schemes for preparing Greenberger-Horne-Zeilinger (GHZ) states. Our approach relies on training variational quantum circuits with white noise affected GHZ states as inputs. Optimizing for a single iteration of the scheme, we find that it is possible to achieve an increased fidelity to the GHZ state, although further iterations decrease the fidelity. The same scheme, acting on coherently distorted pure-state inputs, is effective only in certain special cases. We show that radically different results can be achieved, however, when one optimizes for the output after two iterations of the protocol. In this case, the obtained schemes are more effective in distilling GHZ states from inputs affected by white noise. Moreover, they can also correct several types of coherent pure-state errors. |
| title | Training iterated protocols for distillation of GHZ states with variational quantum algorithms |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2311.04646 |