Led by Professor Wang Jianwei and Professor Gong Qihuang from the School of Physics at Peking University, in collaboration with Professor Su Xiaolong's research team from Shanxi University, the research has implications for quantum computation, networking and metrology.

Continuous-variable integrated quantum photonic chips have been confined to the encoding of and entanglement between two qumodes, a bottleneck withholding the generation or verification of multimode entanglement on chips. Additionally, past research on cluster states failed to go beyond discrete viable, leaving a gap in the generation and detection of continuous-variable entanglement on photonic chips.

This study marks an unprecedented deterministic generation, manipulation and detection of continuous-variable multipartite entanglement on an integrated-optical quantum chip.

Among the key findings is on-chip deterministic generation of continuous-variable multipartite entanglement in an integrated optical microcomb: polychromatic pump and polychromatic homodyne detection technologies (see Fig. 1c) produce multimode squeezed-vacuum optical frequency combs below the threshold of parametric oscillation, demonstrating the chip-scale deterministic generation of continuous-variable multipartite entanglement.