New method achieves tenfold increase in quantum coherence time via destructive interference of correlated noise

Researchers have developed a new method to significantly improve the performance of quantum technology by using the cross-correlation of two noise sources to extend coherence time, improve control fidelity, and increase sensitivity for high-frequency detection. This innovative strategy addresses key challenges in quantum systems, offering a tenfold increase in stability and paving the way for more reliable and versatile quantum devices.

The work has been published in the magazine Physical assessment letters.

Researchers have made a major breakthrough in quantum technology by developing a new method that dramatically improves the stability and performance of quantum systems. This groundbreaking work addresses the long-standing challenges of decoherence and imperfect control, paving the way for more reliable and sensitive quantum devices.

Quantum technologies, including quantum computers and sensors, have enormous potential to revolutionize various fields, such as computing, cryptography, and medical imaging. However, their development has been hampered by the detrimental effects of noise, which can disrupt quantum states and lead to errors.

Many traditional approaches to reducing noise in quantum systems focus primarily on temporal autocorrelation, which examines how noise behaves over time. While these methods are effective to some extent, they fall short when other types of noise correlation are present.

The research was conducted by experts in quantum physics, including Ph.D. student Alon Salhov under the supervision of Prof. Alex Retzker from Hebrew University, Ph.D. student Qingyun Cao under the supervision of Prof. Fedor Jelezko and Dr. Genko Genov from Ulm University, and Prof. Jianming Cai from Huazhong University of Science and Technology. They introduced an innovative strategy that exploits the cross-correlation between two noise sources.

By exploiting the destructive interference of cross-correlated noise, the team managed to significantly extend the coherence time of quantum states, improve the control accuracy, and increase the sensitivity for high-frequency quantum detection.

Key results of this new strategy include:

• Tenfold increase in coherence time: The duration over which quantum information remains intact is ten times longer compared to previous methods.
• Improved control accuracy: Improved precision in manipulating quantum systems leads to more accurate and reliable operations.
• Superior sensitivity: The ability to detect high-frequency signals exceeds the current state of the art, enabling new applications in quantum sensing.

Salhov said: “Our innovative approach expands our toolbox for protecting quantum systems from noise. By focusing on the interplay between multiple sources of noise, we have achieved unprecedented levels of performance, bringing us closer to the practical implementation of quantum technologies.”

This advancement not only marks a significant leap in the field of quantum research, but also offers prospects for a wide range of applications. Industries that rely on highly sensitive measurements, such as healthcare, stand to benefit greatly from these improvements.