A single programmable photonic circuit for universal quantum measurements
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911531998904320 |
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| author | Yan, Wen-Zhe Feng, Lan-Tian Hou, Zhibo Zhao, Yuan-Yuan Carceller, Carles Roch i Tavakoli, Armin Zhu, Huangjun Guo, Guang-Can Ren, Xi-Feng Xiang, Guo-Yong |
| author_facet | Yan, Wen-Zhe Feng, Lan-Tian Hou, Zhibo Zhao, Yuan-Yuan Carceller, Carles Roch i Tavakoli, Armin Zhu, Huangjun Guo, Guang-Can Ren, Xi-Feng Xiang, Guo-Yong |
| contents | Programmable photonic quantum processors face a critical challenge: despite significant advances in quantum state preparation and manipulation, measurements remain limited to projective techniques. Here, we demonstrate a programmable measurement processor that overcomes this limitation by enabling arbitrary quantum measurements within a scalable circuit framework. Our large-scale integrated photonic architecture achieves precise coherent control of ancillary quantum systems, realizing a universal four-dimensional quantum measurement device. We benchmark the processor by performing measurement tomography on 100 randomly selected measurements, achieving an average fidelity of 97.7%. The processor's performance exceeds the theoretical limits of projective measurements in three key quantum information tasks: state discrimination (with 23 times lower error), state estimation (with 10.6% higher fidelity), and randomness generation (with 37% more randomness yield), demonstrating its high operational quality. This work establishes a fully programmable quantum measurement processor, advancing the development of universal quantum operations for photonic quantum information processing by providing the key missing component. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_20085 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A single programmable photonic circuit for universal quantum measurements Yan, Wen-Zhe Feng, Lan-Tian Hou, Zhibo Zhao, Yuan-Yuan Carceller, Carles Roch i Tavakoli, Armin Zhu, Huangjun Guo, Guang-Can Ren, Xi-Feng Xiang, Guo-Yong Quantum Physics Programmable photonic quantum processors face a critical challenge: despite significant advances in quantum state preparation and manipulation, measurements remain limited to projective techniques. Here, we demonstrate a programmable measurement processor that overcomes this limitation by enabling arbitrary quantum measurements within a scalable circuit framework. Our large-scale integrated photonic architecture achieves precise coherent control of ancillary quantum systems, realizing a universal four-dimensional quantum measurement device. We benchmark the processor by performing measurement tomography on 100 randomly selected measurements, achieving an average fidelity of 97.7%. The processor's performance exceeds the theoretical limits of projective measurements in three key quantum information tasks: state discrimination (with 23 times lower error), state estimation (with 10.6% higher fidelity), and randomness generation (with 37% more randomness yield), demonstrating its high operational quality. This work establishes a fully programmable quantum measurement processor, advancing the development of universal quantum operations for photonic quantum information processing by providing the key missing component. |
| title | A single programmable photonic circuit for universal quantum measurements |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.20085 |