2020 Fiscal Year Annual Research Report
Operational characterization of multi-photon entanglement in linear optics networks
| Project/Area Number |
19F19817
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| Research Institution | The University of Tokyo |
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Principal Investigator |
村尾 美緒 東京大学, 大学院理学系研究科(理学部), 教授 (30322671)
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| Co-Investigator(Kenkyū-buntansha) |
WU JUNYI 東京大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2019-11-08 – 2022-03-31
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| Keywords | Linear optics network / Multiphoton states / bipartite entanglement / Complementary property / Pauli measurements / Fidelity estimation |
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| Outline of Annual Research Achievements |
In 2020, we have continued our research on the characterization of quantum states in multiphoton linear optics networks.
We have established a theory for the characterization of complementary properties in multiphoton linear optics networks (LONs) in an experimentally feasible way, which has been published in “New Journal of Physics 22, 103054 (2020)”. This theory can be then employed for entanglement detection in multiphoton LON systems without falling into the computational complexity of boson sampling. It allows us to extend well-established methods for entanglement detection in multipartite qudit systems to multipartite LONs. As a result, “entanglement between modes” in multiphoton LON systems can be physically detected in measurements. We have presented this result at the conferences “AQIS 2020” and “QIP 2021”.
A step further than the entanglement detection, we would like to evaluate the similarity between a quantum state and a target state in LONs. To this end, we need to first establish a theory for quantum state fidelity estimation employing state verifiers. We have therefore proposed a protocol for quantum state fidelity estimation for entangled states in bipartite qudit systems employing a set of local measurements, which has been published in “Entropy 22, 889 (2020)”. Based on this theory, one can construct and evaluate state verifiers for multiphoton states in LONs in experiments to estimate lower and upper bounds on quantum state fidelity. This result has been presented at the conference “Workshop on quantum information science 2020”.
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| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
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| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
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