Researchers have developed a new way to measure how quantum information behaves in correlated quantum systems that could be useful for understanding and improving quantum devices and quantum error correction codes.
“We are all excited about the potential of quantum entanglement for quantum information processing,” said Mohamad Niknam, who was a postdoctoral fellow at IQC when he co-authored the paper.
Mohammad Niknam
The team, which includes Lea Santos of Yeshiva University and IQC and University of Waterloo Department of Chemistry faculty member David Cory, call the new quantity the “correlation Renyi entropy.”
The researchers developed a protocol to measure this entropy using nuclear magnetic resonance techniques. They found that the correlation Renyi entropy captures information about the long-time dynamics of the quantum system that is usually not captured by existing entropies, such as entanglement entropy.
Providing a better understanding and quantification of the spread of quantum information, the researchers’ new entropy will be a useful tool for scientists looking to measure and control the evolution of quantum systems in the devices that will power the next quantum revolution.
Experimental Detection of the Correlation Rényi Entropy in the Central Spin Model was published in Physical Review Letters on August 18, 2021.
This research was funded thanks in part to the Canada First Research Excellence Fund (CFREF).