The reporter learned from the Key Laboratory of Microscopic Magnetic Resonance of the Chinese Academy of Sciences that the laboratory has made significant progress in zero magnetic field NMR. This achievement is expected to promote the application of zero magnetic field NMR in the fields of biology, medicine, chemistry and basic physics.
Prof. Peng Xinhua, the key laboratory of the Micro-Magnetic Resonance Laboratory of the Chinese Academy of Sciences, cooperated with German and Canadian scientific research institutions to realize the universal quantum control of the zero-magnetic nuclear spin system for the first time, and developed methods for evaluating quantum control and quantum states. Relevant research results have been published in the famous international journal Science Progress.
Zero-field magnetic resonance is a new field that is rapidly developing. It has many outstanding advantages, such as eliminating the dependence of traditional nuclear magnetic resonance on superconducting magnets, high-resolution spectroscopy, rich spin dynamics, etc. However, zero Magnetic field NMR faces many difficulties: First, under the zero magnetic field, the traditional NMR induction detection method is completely ineffective, and it is very difficult to detect the zero magnetic field NMR signal. Secondly, the zero magnetic field NMR is due to different nuclear spins. The precession frequency is zero, so it is impossible to use the selective pulse to control. How to achieve universal quantum control is a difficult problem to solve.
The research team realized the universal quantum control of zero magnetic field NMR by using the well-designed combined pulse to realize the single-bit gate and multi-bit gate of the nuclear spin. At the same time, the method of evaluating the fidelity of quantum control was developed. The quality has been evaluated and the fidelity of manipulation is as high as 99%. Based on the quantum control technology developed by this work, selective measurement of the interaction between different spins can be achieved, and the antisymmetric spin interaction can be selected. It is used to test the non-conservation law of the parity of the molecule. This work provides the possibility of applying zero magnetic field NMR to basic physics research.
