Work

Scalable symmetry detector and its applications by using beam splitters and weak nonlinearities

Year: 2017

Type: article

Abstract: We describe a method to detect twin-beam multiphoton entanglement based on a beam splitter and weak nonlinearities. For the twin-beam four-photon entanglement, we explore a symmetry detector. It works not only for collecting two-pair entangled states directly from the spontaneous parametric down-conversion process, but also for generating them by cascading these symmetry detectors. Surprisingly, by calculating the iterative coefficient and the success probability we show that with a few iterations the desired two-pair can be obtained from a class of four-photon entangled states. We then generalize the symmetry detector to n-pair emissions and show that it is capable of determining the number of the pairs emitted indistinguishably from the spontaneous parametric down-conversion source, which may contribute to explore multipair entanglement with a large number of photons.

Source: Scientific Reports

DOI: 10.1038/s41598-017-15691-0

Authors: Ying-Qiu He, Dong Ding, Feng-Li Yan, Ting Gao

Institutions: Chengde Medical University, North China Institute of Science and Technology, Hebei Normal University

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funders: National Natural Science Foundation of China, Ministry of Education of the People's Republic of China, Chengde Medical University, Fundamental Research Funds for the Central Universities