Scientists develop new way to tackle key quantum computing challenge

Researchers at the Quantum Information and Computing (QuIC) laboratory of Raman Research Institute in Bengaluru announced a new technique that uses a precisely timed single‑shot operation to manage decoherence in quantum bits. The work, headed by senior professor Urbani Sinha, shows that the timing of this operation can either delay the loss of entanglement or, if applied at a different instant, accelerate decoherence, offering a novel control lever for quantum processors.

The team’s experiments, detailed in a paper in the American Physical Society’s journal Physical Review A, demonstrate that a single intervention—rather than repeated corrective cycles—can modulate the fragile quantum states that underpin quantum computing. By adjusting the moment of application, the operation can suppress the phenomenon known as entanglement sudden death, a rapid disappearance of quantum correlations that has long challenged reliable computation.

Quantum computers exploit entanglement and superposition to solve problems beyond the reach of classical machines, but their extreme sensitivity to environmental disturbances limits practical use. The new timing‑based control adds to existing strategies such as improved materials, refined gate designs, and error‑correction protocols, potentially enhancing the stability of future quantum devices worldwide.