Quantum computers can analyze their own entanglement now

Quantum computers can solve complex problems much faster than traditional computers. Researchers have now developed a new algorithm that allows these computers to analyze their own quantum entanglement, a key aspect of how they function. The algorithm, created by Tohoku University and St. Paul’s School, enhances the detection and protection of entanglement. This advancement improves understanding of quantum mechanics, which is vital for future technologies. The research was published on March 4, 2025. Quantum entanglement connects particles regardless of distance, making it crucial for the power of quantum computers. However, traditional methods of measuring this entanglement can sometimes destroy it. The new method, called variational entanglement witness, helps detect entanglement more accurately without harming it. The lead researcher, Le Bin Ho, emphasized that this is the first quantum algorithm capable of both detecting and preserving entanglement. The team intends to continue refining the algorithm to enhance the efficiency of entanglement detection, which is essential for areas like quantum computing and communication.