Overview
Researchers from the Hebrew University of Jerusalem, along with collaborators from Ulm University and Huazhong University of Science and Technology, have developed a groundbreaking method that significantly enhances the stability and performance of quantum systems. This new technique tackles major challenges like decoherence and control errors, resulting in a tenfold increase in coherence time, improved control fidelity, and superior sensitivity in quantum sensing.
The Challenge of Noise in Quantum Systems
Quantum technologies, including quantum computers and sensors, promise to revolutionize fields like computing, cryptography, and medical imaging. However, their development has been hindered by noise, which can disrupt quantum states and cause errors. Traditional approaches to mitigating noise often fall short, especially when dealing with complex noise correlations.
Innovative Strategy to Combat Noise.
The research team, led by PhD student Alon Salhov and Prof. Alex Retzker, introduced a novel strategy that leverages the cross-correlation between two noise sources. This method exploits the destructive interference of these noise sources to significantly extend the coherence time of quantum states, improve control fidelity, and enhance sensitivity for high-frequency quantum sensing.
Key Achievements
1. Tenfold Increase in Coherence Time: Quantum information remains intact ten times longer compared to previous methods.
2. Improved Control Fidelity: Enhanced precision in manipulating quantum systems leads to more accurate and reliable operations.
3. Superior Sensitivity: The ability to detect high-frequency signals surpasses the current state-of-the-art, enabling new applications in quantum sensing.
Detailed Mechanism
- Noise Interference: The method involves applying a resonant drive to a qubit, creating a protected dressed qubit. By applying a second drive with specific modulation frequency and amplitude fluctuations, the team reduces decoherence. Also read..“Headline: Quantum Computing Breakthrough Propels Industry into New Era of Innovation"
- Destructive Interference: If the cross-correlation of the noise sources is non-zero, this setup induces destructive interference, resulting in a doubly-dressed qubit with a longer coherence time.
- Measurement and Setup: The research included standard and correlated double drive (DD) protocols and involved experimental setups with NV centers.
Impact and Future Applications
This advancement not only marks a significant leap 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, could benefit enormously from these improvements.
Research Credits
The research was conducted by Alon Salhov under the guidance of Prof. Alex Retzker from Hebrew University, Qingyun Cao under the guidance of Prof. Fedor Jelezko and Dr. Genko Genov from Ulm University, and Prof. Jianming Cai from Huazhong University of Science and Technology. Their work is published in Physical Review Letters, titled “Protecting Quantum Information via Destructive Interference of Correlated Noise.”
Conclusion
This innovative approach extends the toolbox for protecting quantum systems from noise, unlocking unprecedented levels of performance and bringing us closer to the practical implementation of quantum technologies.
Reference
Salhov, A., Cao, Q., Cai, J., Retzker, A., Jelezko, F., & Genov, G. (2024). "Protecting Quantum Information via Destructive Interference of Correlated Noise." Physical Review Letters, 132(223601). DOI: 10.1103/PhysRevLett.132.223601