Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources
Abstract Variational quantum algorithms are hybrid quantum-classical approaches extensively studied for their potential to leverage near-term quantum hardware for computational advantages. In this work, we successfully execute two variational quantum algorithms on a silicon photonic integrated circu...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-07-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-025-01061-6 |
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| _version_ | 1849238354292375552 |
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| author | Alessio Baldazzi Matteo Sanna Massimo Borghi Stefano Azzini Lorenzo Pavesi |
| author_facet | Alessio Baldazzi Matteo Sanna Massimo Borghi Stefano Azzini Lorenzo Pavesi |
| author_sort | Alessio Baldazzi |
| collection | DOAJ |
| description | Abstract Variational quantum algorithms are hybrid quantum-classical approaches extensively studied for their potential to leverage near-term quantum hardware for computational advantages. In this work, we successfully execute two variational quantum algorithms on a silicon photonic integrated circuit at room temperature: a variational quantum eigensolver for the Hydrogen molecule and a variational quantum factorization for semiprime numbers. In our reconfigurable silicon photonic circuit, four identical spontaneous-four-wave-mixing-based integrated photon pair sources are used to prepare two path-entangled ququarts, whose correlation gives rise to the resource for generic trial states’ preparation. This marks a first demonstration of variational quantum algorithms on a photonic quantum simulator with integrated photon pair sources. |
| format | Article |
| id | doaj-art-49cc27482fbd4b7eb87eebbd205f169d |
| institution | Kabale University |
| issn | 2056-6387 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj-art-49cc27482fbd4b7eb87eebbd205f169d2025-08-20T04:01:40ZengNature Portfolionpj Quantum Information2056-63872025-07-0111111110.1038/s41534-025-01061-6Four-qubit variational algorithms in silicon photonics with integrated entangled photon sourcesAlessio Baldazzi0Matteo Sanna1Massimo Borghi2Stefano Azzini3Lorenzo Pavesi4Department of Physics, University of TrentoDepartment of Physics, University of TrentoDepartment of Physics, University of TrentoDepartment of Physics, University of TrentoDepartment of Physics, University of TrentoAbstract Variational quantum algorithms are hybrid quantum-classical approaches extensively studied for their potential to leverage near-term quantum hardware for computational advantages. In this work, we successfully execute two variational quantum algorithms on a silicon photonic integrated circuit at room temperature: a variational quantum eigensolver for the Hydrogen molecule and a variational quantum factorization for semiprime numbers. In our reconfigurable silicon photonic circuit, four identical spontaneous-four-wave-mixing-based integrated photon pair sources are used to prepare two path-entangled ququarts, whose correlation gives rise to the resource for generic trial states’ preparation. This marks a first demonstration of variational quantum algorithms on a photonic quantum simulator with integrated photon pair sources.https://doi.org/10.1038/s41534-025-01061-6 |
| spellingShingle | Alessio Baldazzi Matteo Sanna Massimo Borghi Stefano Azzini Lorenzo Pavesi Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources npj Quantum Information |
| title | Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| title_full | Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| title_fullStr | Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| title_full_unstemmed | Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| title_short | Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| title_sort | four qubit variational algorithms in silicon photonics with integrated entangled photon sources |
| url | https://doi.org/10.1038/s41534-025-01061-6 |
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