a, Aerial view of the teleportation system. Alice A is situated at networks changing room, Bob B and Charlie C lie at two apart labs. All fibers linking the 3 nodes come from the UESTC foundation network. Throughout the experiment, just the signals developed by Alice, Bob and Charlie are moved through these dark fibers. b, Scheme of the teleportation system. Alice prepares the initial state with a weak coherent single-photon source and sends it to Charlie through a quantum channel. An entanglement source at Bob generates a set of knotted photons and then sends the idler photon to Charlie through another quantum channel The signal photon is kept in a fiber spindle. Charlie executes a joint Bell-state measurement (BSM) between the qubit sent by Alice and Bob, forecasting them onto among the four Bell states. Then the BSM outcome is sent to Bob by means of a classical channel, who carries out a unitary (U) transformation on the signal photon to recuperate the preliminary state. Credit: Si Shen, Chenzhi Yuan, Zichang Zhang, Hao Yu, Ruiming Zhang, Chuanrong Yang, Hao Li, Zhen Wang, You Wang, Guangwei Deng, Haizhi Song, Lixing You, Yunru Fan, Guangcan Guo and Qiang Zhou
” Demonstrating high-speed quantum teleportation beyond a laboratory involves an entire set of obstacles. This experiment shows how these difficulties can be conquered and hence it develops an essential milestone towards the future quantum web,” stated Prof. Qiang Zhou, who is the corresponding author of this work. The primary experimental obstacle in a real-world quantum teleportation system is carrying out the Bell state measurement (BSM).
In order to make sure the successful quantum teleportation and enhance the efficiency of BSM, Alices and Bobs photons require to be identical at Charlie after long-distance transmission in fiber. The team established a fully running feedback system, which understood the quick stabilization of the path length difference and polarization of the photons.
Innovative Techniques and Equipment
On the other hand, the team utilized a single piece of fiber-pigtailed periodically poled lithium niobate waveguide to generate the entangled photon pairs. Based on this, a premium quantum knotted light source with a 500 MHz repetition rate was developed for the teleportation system.
Both fidelities from the 2 techniques exceed the classical limit of 2/3, i.e., the rushed gray line. Credit: Si Shen, Chenzhi Yuan, Zichang Zhang, Hao Yu, Ruiming Zhang, Chuanrong Yang, Hao Li, Zhen Wang, You Wang, Guangwei Deng, Haizhi Song, Lixing You, Yunru Fan, Guangcan Guo and Qiang Zhou
Such a high-speed quantum teleportation based upon quantum optics needs the most delicate photon sensing units in order to collect as many events as possible. The group led by Prof. Lixing You, along with colleagues of Photon Technology Co., LTD, provided high-performance superconducting nanowire single-photon detectors for the experiment. Benefiting from the detectors with excellent efficiency and nearly no sound, high-efficiency BSM and quantum state analysis were attained.
Promising Results and Future Applications
The team used both quantum state tomography and decoy-state techniques to determine the teleportation fidelities, which were well above the classical limit (66.7%), validating that high-speed urbane quantum teleportation has actually been accomplished.
The “No. 1 Metropolitan Quantum Internet of UESTC” is anticipated to develop a “high speed, high fidelity, multi-users, long-distance” quantum internet facilities in the future by integrating integrated quantum lights, quantum repeaters, and quantum information nodes. The team also anticipates that this infrastructure will further promote the useful application of quantum web.
Recommendation: “Hertz-rate city quantum teleportation” by Si Shen, Chenzhi Yuan, Zichang Zhang, Hao Yu, Ruiming Zhang, Chuanrong Yang, Hao Li, Zhen Wang, You Wang, Guangwei Deng, Haizhi Song, Lixing You, Yunru Fan, Guangcan Guo and Qiang Zhou, 10 May 2023, Light: Science & & Applications.DOI: 10.1038/ s41377-023-01158-7.
The study was funded by the National Key Research and Development Program of China, the National Natural Science Foundation of China, the Innovation Program for Quantum Science and Technology, and the Sichuan Science and Technology Program..
By Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS
October 19, 2023
Quantum teleportation enables the transfer of quantum info to distant places through the use of quantum entanglement and classical communication. There hasnt been a quantum teleportation system yet whose rate can reach the order of Hertz.” Demonstrating high-speed quantum teleportation outside of a lab includes a whole set of obstacles. The primary experimental difficulty in a real-world quantum teleportation system is performing the Bell state measurement (BSM).
Such a high-speed quantum teleportation based on quantum optics requires the most delicate photon sensing units in order to collect as lots of events as possible.
Advancing quantum teleportation, researchers set a brand-new speed record of 7.1 qubits per second, using innovative innovation and conquering prior limitations, marking a pivotal stride toward an efficient, significant quantum web.
Quantum teleportation makes it possible for the transfer of quantum details to remote areas through the usage of quantum entanglement and classical communication. There hasnt been a quantum teleportation system yet whose rate can reach the order of Hertz.
Improvements in Teleportation Speed
In a paper published in Light Science & & Application, a group of researchers, led by Prof. Guangcan Guo and Prof. Qiang Zhou from the University of Electronic Science and Technology of China (UESTC) complying with Prof. Lixing You from the Shanghai Institute of Microsystem and Information Technology of the Chinese Academy of Sciences, have enhanced the teleportation rate to 7.1 qubits per second for the very first time based on the “No. 1 Metropolitan Quantum Internet of UESTC”.
This provides a brand-new record for the quantum teleportation system over urbane range.
