The article provides information about the image on the cover of Advanced Photonics Nexus, Volume 2, Issue 1.
Abstract
The article provides information about the image on the cover of Advanced Photonics Nexus, Volume 2, Issue 1.
Large-number () photon state is important for not only study of fundamental quantum physics but also practical applications of quantum information. However, due to the weak interaction between photons, generating -photon state remains a fundamental challenge in the field of quantum optics. Researchers from Nanjing University propose the first feasible scheme for deterministic generation of -photon states taking account of practical material capability, using the ultra-strong nonlinear interaction in the lithium niobate on insulator (LNOI) platform.
In their work, “Deterministic -photon state generation using lithium niobate on insulator device” (doi: 10.1117/1.APN.2.1.016003) authors Hua-Ying Liu, Minghao Shang, Xiaoyi Liu, Ying Wei, Minghao Mi, Lijian Zhang, Yan-Xiao Gong, Zhanda Xie, and Shining Zhu design a standard photon-number doubling unit (PDU) composed by single photon deterministic parametric down-conversion (DPDC) and deterministic parametric up-conversion (DPUC) in an LNOI circuit, where single-photon can be converted to bi-photon without frequency change. Through such a PDU, -photon state can in principle be generated deterministically with unlimited photon numbers.
The image on the cover for Advanced Photonics Nexus Volume 2 Issue 1 provides a visual rendering of this on-chip scheme for deterministic -photon state generation in LNOI circuit, where DPDC and DPUC are realized through a high- microring resonator and a spiral waveguide, respectively. The research is summarized with a helpful video by first author Minghao Shang in a news story on SPIE.org, “Toward practical quantum optics: multiphoton qubits from LNOI” (https://spie.org/news/toward-practical-quantum-optics-multiphoton-qubits-from-lnoi).
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