According to the recent report of the American Physical Review Express website, the team of Jin Xianmin of Shanghai Jiaotong University has developed the world's first orbital angular momentum (OAM) waveguide photonic chip. This is the first time to fabricate an optical waveguide that can carry photon OAM degrees of freedom in an optical chip, and to achieve efficient and high fidelity transmission of photon OAM in the waveguide. The latest research is highlighted as a highlight article on the homepage of the website, and it is expected to “show its talents” in the fields of optical communication and quantum computing.

In recent years, twisted light has been widely used in the fields of light manipulation, optical clamps, and the like because of the intensity structure of the "doughnut" distribution, the phase structure of the spiral wavefront, and the dynamic characteristics of carrying OAM. Different from the spin angular momentum of light, OAM has unlimited topological charge and intrinsic orthogonality, which can be used to solve the problem of channel capacity shrinkage in communication systems. In the field of quantum information, photon OAM can be used to distribute high-dimensional quantum states and construct high-dimensional quantum computers.

However, the large-scale application of OAM needs to integrate its transmission, generation and manipulation. Previous studies have not allowed OAM to exist inside the chip.

In the latest research, Jin Xianmin team prepared the first three-dimensional integrated OAM waveguide photonic chip with a waveguide cross section of “doughnut” through femtosecond laser direct writing technology. By measuring the interference of the distorted light from the chip with the reference light and the projection measurement of the state before and after the chip, the experiment proves that the waveguide can transmit the low-order OAM mode with high efficiency and high fidelity, and the total transmission efficiency is 60%; and the waveguide The high-order mode is converted to the low-order mode. In addition, the waveguide can also transmit a three-bit "high-dimensional qubit" state with high fidelity, surpassing the traditional two-bit "qubit" state, indicating that the waveguide has potential for high-dimensional quantum states. Transmission and manipulation.

Jin Xianmin hopes that the chip can be used first in the field of high-throughput optical communication; and Keshan Dolakia, a light control expert at St. Andrews University in the UK, believes that the new chip is expected to open up new horizons for quantum optics and imaging. It is reported that the team has applied for invention patents for the waveguide chip to the State Intellectual Property Office.

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