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

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

The work was published in the journal Physical review papers.

Researchers have made a significant advance in quantum technology by developing a new method that dramatically improves the stability and performance of quantum systems. This pioneering work addresses the longstanding challenges of decoherence and imperfect control, paving the way for more reliable and sensitive quantum devices.

Quantum technologies, including quantum computers and sensors, have tremendous potential for revolutionizing fields as diverse as computing, cryptography, and medical imaging. However, their development has been hampered by the harmful effects of noise, which can disrupt quantum states and lead to errors.

Many traditional approaches to noise mitigation in quantum systems focus primarily on temporal autocorrelation, which examines how noise behaves over time. Although effective to some extent, these methods are deficient when other types of noise correlations exist.

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

By exploiting the destructive interference of coherent noise, the team has managed to significantly extend the coherence time of quantum states, improve control fidelity and increase sensitivity for high-frequency quantum sensing.

Key achievements of this new strategy include:

• Tenfold increase in coherence time: The duration for which quantum information remains intact is extended tenfold compared to previous methods.
• Improved control fidelity: Increased precision in the manipulation of quantum systems leads to more precise and reliable operations.
• High 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 interaction between multiple sources of noise, we have unlocked unprecedented levels of performance, bringing us closer to practical implementation of the technologies quantum.”

This advance not only marks an important step in the field of quantum research, but also holds promise for a wide range of applications. Industries that rely on highly sensitive measurements, such as healthcare, can benefit immensely from these improvements.