The reporter learned from the Key Laboratory of Microscopic Magnetic Resonance, Chinese Academy of Sciences, that the laboratory has made important progress in zero-field magnetic resonance, and this result is expected to promote the application of zero-field magnetic resonance in the fields of biology, medicine, chemistry, and basic physics.
Professor Peng Xinhua from the Chinese Academy of Sciences' Key Laboratory of Micro Magnetic Resonance cooperated with German and Canadian scientific research institutes to realize the universal quantum control of zero magnetic field nuclear spin system for the first time and developed methods for evaluating quantum control and quantum states. Recent research results have been published in the scientific progress of the famous international journal.
Zero magnetic field NMR is a new area that is rapidly developing and has many outstanding advantages, such as eliminating the dependence of traditional nuclear magnetic resonance on superconducting magnets, high resolution spectroscopy, abundant spin dynamics, etc. However, zero Magnetic field NMR is faced with many difficulties: First of all, in the zero magnetic field, the traditional NMR inductive detection method completely fails, it is very difficult to detect the zero magnetic field NMR signal; Secondly, zero magnetic field NMR due to different nuclear spins Ramo Because the precession frequency is zero, it is impossible to use the selective pulse to control. How to implement universal quantum control is a problem that needs to be solved.
The group used a well-designed combination of pulses to implement single- and multi-bit gates of atomic nuclear spins. For the first time, a universal quantum magnetic control of zero-field magnetic resonance was realized, and a method for evaluating the fidelity of quantum control was developed. The quality was evaluated and the fidelity of control was as high as 99%. Based on the quantum control technology developed in this work, selective measurement of the interaction between different spins can be achieved, and the selected antisymmetric spin interaction can be achieved. It is used to check the non-conservative law of the parity of the molecule. This work provides the possibility to apply zero magnetic field NMR to basic physics research.
