IT之家 3 月 31 日消息，據中國科大官方消息，該校郭光燦院士團隊在Can be integrated quantum storageSignificant progress has been made in this area.
Based on the team's original noise-free photon echo (NLPE) scheme, the research group of Li Chuanfeng and Zhou ZongquanThe storage time of integrable quantum memory has been increased from 10 microseconds to milliseconds, and the efficiency of traditional fiber delay lines has been successfully broken。該成果 3 月 26 日發表在國際知名學術期刊《科學・進展》上。
As the core device to overcome channel loss and build large-scale quantum networks, the large-scale application of optical quantum memory needs to realize the integration of devices to achieve the goals of small size and low power consumption. Since 10, integrable quantum memories have been fabricated in rare earth doped crystals using a variety of processes internationally. However, due to the difficulty of noise filtering out and the limited storage efficiency of integrated devices, the existing devices can only realize the storage in the excited state of atoms, and the storage time is only 0 microseconds, which is much lower than the transmission efficiency of optical fiber delay lines, which fundamentally limits its practical application in long-range quantum communication.
In order to solve this problem, the research group of Li Chuanfeng and Zhou Zongquan used femtosecond laser micromachining technology to prepare circularly symmetrical concave cladding optical waveguides in europium-doped yttrium silicate crystals, which realized noise filtering based on polarization degrees of freedom, and combined with the team's original NLPE quantum storage scheme, the storage efficiency was greatly improved, so as to realize the integrated quantum storage of spin waves in the atomic ground state [National Science Review 2024, nwae0 (0)].
Recently, the team integrated a coplanar electric waveguide on the upper surface of the crystal, and realized the dynamic decoupling control of the spin transition of the optic waveguide by applying a radiofrequency magnetic field, thereby extending the spin wave quantum storage lifetime to the millisecond level. When the storage time of optical qubits reaches 01.0 milliseconds, its storage efficiency reaches 0.0±0.0%, which far exceeds the transmission efficiency of the corresponding delay line of the optical fiber delay line (only 0.0%).It is fully proved that integrable quantum memory devices are functionally impossible to be replaced by fiber optic delay lines。
This work increases the lifetime of integrable quantum memory from 10 microseconds to milliseconds, and achieves a breakthrough in storage efficiency beyond optical fiber delay lines for the first time.It lays a solid foundation for the practical application of integrable quantum storage in long-range quantum networks。 At the same time, this achievement shows the great potential of the NLPE scheme to solve the signal-to-noise ratio problem of long-lived quantum storage. "This is a very important achievement in the field of integrated quantum memories," and "this work makes a significant contribution to the development of integrated." and long-duration quantum memories".
The first author of the paper is Liu Yuping, a doctoral student at the Key Laboratory of Quantum Information of the Chinese Academy of Sciences. This work was supported by the Science and Technology Innovation 2030 Major Project, the National Natural Science Foundation of China, Anhui Province, and the Chinese Academy of Sciences. Zhou Zongquan was funded by the outstanding members of the Youth Innovation Promotion Association of the Chinese Academy of Sciences.
IT Home with paper link: