A Precisely Timed Flip Could Help Quantum Computers Hold on to Information Longer
- 7 September 2026
- 2 min read
Researchers at Bengaluru's Raman Research Institute and international collaborators have demonstrated that a single, carefully timed operation can delay or prevent the sudden loss of a special connection between quantum particles. The discovery could help scientists develop more reliable quantum technologies in the future.
Quantum computers could solve certain problems that are difficult for conventional computers, but they face a major challenge: the delicate quantum states they rely on, which can be disrupted by their surroundings. One such resource is quantum entanglement, a phenomenon in which two particles share a linked quantum state, even when separated. As these particles interact with their environment, the connection can weaken or disappear abruptly, a phenomenon known as entanglement sudden death. Researchers from the Raman Research Institute (RRI), the University of Calgary and Louisiana State University investigated whether this loss could be controlled through a simple intervention. They created pairs of entangled photons, the particles that make up light, and passed them through an optical setup that allowed them to study how the connection weakened over time. Using an optical component called a waveplate, they applied a single operation that effectively flipped the particles' quantum states. The crucial discovery was that the timing of this operation changed the outcome. Applied early enough, it could prevent the sudden loss of entanglement; applied at another point, it could delay the loss or even make it happen sooner. The team also developed a theoretical framework that helps explain different ways quantum information can be lost to the environment. The research, led by Saumya Ranjan Behera and involving the Quantum Information and Computing laboratory at RRI, was published in the journal Physical Review A on 6 July 2026. The work was partly supported by the Department of Science and Technology's National Quantum Mission. While the experiment does not yet demonstrate a practical quantum computer, it establishes a potential way to control fragile quantum connections without relying on repeated corrective operations. In the longer term, such methods could help researchers improve quantum communication, quantum information processing and other technologies that depend on preserving quantum states.
