Yixiang Liu

Title: Yixiang Liu and Quantum Frequency-Mixing Sensors.

Introduction

Yixiang Liu is an inventor based in Cambridge, Massachusetts, and is associated with the Massachusetts Institute of Technology. His patent work explores ways to expand the frequencies that quantum sensors can detect.

Latest Patents

Liu is named on 1 patent, titled “Quantum Mixer to Sense Arbitrary-Frequency Fields.” The invention addresses a limitation of quantum sensors: their ability to detect signals is generally restricted to certain frequency ranges, including low frequencies and narrow windows near sensor resonances.

The disclosed technique uses a sensor qubit as a quantum frequency mixer. By leveraging nonlinear effects in periodically driven, or Floquet, quantum systems, it mixes a signal field with an applied AC bias field. The resulting frequency-mixed field can then be detected using Rabi or CPMG sensing techniques. The approach can also distinguish vector components of an oscillating signal, supporting arbitrary-frequency vector magnetometry. The patent describes a demonstration using nitrogen-vacancy centers in diamond to sense a 150 MHz signal field.

Career Highlights

Liu’s listed work connects quantum sensing with frequency-mixing methods designed to broaden the range of measurable signals. His association with the Massachusetts Institute of Technology places this research within a major academic and scientific institution.

Collaborations

Liu’s listed collaborators include Guoqing Wang and Jennifer Schloss. Their work is associated with research on quantum sensing and the frequency-mixing approach described in the patent.

Conclusion

Yixiang Liu’s patent presents a quantum frequency-mixing technique that could help sensors detect signals beyond their usual frequency ranges and enable vector measurements of oscillating fields.