Qiu Jiawei, Liu Yang, Hu Ling, Wu Yukai, Niu Jingjing, Zhang Libo, Huang Wenhui, Chen Yuanzhen, Li Jian, Liu Song, Zhong Youpeng, Duan Luming, Yu Dapeng
Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; International Quantum Academy, Shenzhen 518048, China; Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China.
Sci Bull (Beijing). 2025 Feb 15;70(3):351-358. doi: 10.1016/j.scib.2024.11.047. Epub 2024 Dec 3.
Quantum teleportation is of both fundamental interest and great practical importance in quantum information science. To date, quantum teleportation has been implemented in various physical systems, among which superconducting qubits are of particular practical significance as they emerge as a leading system to realize large-scale quantum computation. Nevertheless, scaling up the number of superconducting qubits on a single chip becomes increasing challenging because of some emergent technical difficulties. Realization of quantum teleportation and remote computation over qubits on distant superconducting chips is a key quantum communication technology to scaling up the system through a distributed quantum computational network. However, this goal has not been realized yet in experiments due to the technical challenges including making a quantum interconnect between distant superconducting chips and the inefficient transfer of flying microwave photons over the lossy interconnects. Here we demonstrate deterministic teleportation of quantum states and entangling gates between distant superconducting chips connected by a 64-m-long cable bus featuring an ultralow loss of 0.32 dB/km at cryogenic temperatures, where high fidelity remote entanglement is generated via flying microwave photons. Our work demonstrates a prime building block for distributed quantum computation with superconducting qubits, and opens up a new avenue for waveguide quantum electrodynamics and quantum photonics at microwave frequencies.
量子隐形传态在量子信息科学中既具有根本重要性又具有重大实际意义。迄今为止，量子隐形传态已在各种物理系统中得以实现，其中超导量子比特具有特别的实际意义，因为它们正成为实现大规模量子计算的主导系统。然而，由于一些新出现的技术难题，在单个芯片上增加超导量子比特的数量变得越来越具有挑战性。在遥远的超导芯片上实现量子比特之间的量子隐形传态和远程计算，是通过分布式量子计算网络扩大系统规模的一项关键量子通信技术。然而，由于包括在遥远的超导芯片之间建立量子互连以及在有损耗的互连上飞行微波光子的低效传输等技术挑战，这一目标尚未在实验中实现。在此，我们展示了通过一条64米长的电缆总线连接的遥远超导芯片之间量子态的确定性隐形传态和纠缠门，该电缆总线在低温下具有0.32 dB/km的超低损耗，通过飞行微波光子产生高保真远程纠缠。我们的工作展示了用于超导量子比特分布式量子计算的一个主要构建模块，并为微波频率下的波导量子电动力学和量子光子学开辟了一条新途径。
