My scientist successfully improves the sensitivity of quantum precision measurement

【Technological frontier】

Our newspaper, Beijing, June 19th, reporter Deng Hui learned from Tsinghua University that recently, Associate Professor Sun Lugan Research Group of the School Cross Information Research Institute cooperated with Researcher Zou Changling Researcher Research Group of China University of Science and Technology. The color quantum error -correction encoding to enhance the sensitivity of quantum precision measurement, and provides new ideas for the study of the combination of quantum precision measurement and quantum error correction in the future. Related results are published online in the journal of Nature · Communication.

Since the 20th century, the continuous improvement of measurement accuracy has promoted the development of technology and research in various fields such as biology, medicine, astronomy, and chemistry. Each measuring accuracy may promote the cutting -edge research on research, and even open a new research field.

In the past few years, the superconductant quantum research team of the Tsinghua University's Quantum Information Center has been committed to the study of quantum errors. Recently, they have developed approximate quantum error correction and quantum transition tracking methods, and for the first time, the accuracy of quantum precision measurement is enhanced by approximate boson quantum error coding.

The experimental sample consists of a superconductant quantum and two microwave resonance coupling, respectively. The two microwave resonance cavity in the two microwave cavities are used as detective cavity, and low life span is used as receiving cavity. The experiment first prepares the light field system in the detection cavity to the superposition state of different photons. This state is a typical strange quantum state; then the microwave signal emitted by the external signal source is received with the receiving cavity, and through the two cavity between the two cavity Interaction, the relative phase of the internal light field in the cavity will accumulate over time. Finally, by reading the phase information of the light field in the cavity, you can measure the strength of the microwave signal in the cavity. At the same time, during the detection process, in order to resist the abolition of the internal light fields caused by environmental noise, they used the approximate quantum error operation in a single experiment and can track the number of errors, thereby enhancing The measurement sensitivity of the quantum precision measurement scheme can be achieved.

The experiment is the first time in recent years to use the bosom quantum error correction code to enhance the work of quantum precision measurement, which proves that quantum error correction can be used to improve the performance of quantum precision measurement. This scheme can be extended to the ion trap system and emerging quantum acoustic platform.

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