Classical Capacity of Single-Mode Bosonic Gaussian Channels
Finding the speed limit for sending messages through noisy fiber-optic cables
Researchers have solved a decades-old question about the maximum rate at which information can travel through noisy optical channels—the kind used in real fiber-optic and wireless communications. They proved that simple, standard signal encodings are enough to hit this theoretical limit, without needing exotic quantum tricks like entanglement. They also derived the exact trade-off between how fast you can send data and how many errors you'll encounter.
Optical networks carry most of the world's internet traffic, and this work establishes the hard ceiling on how much information those channels can handle. Engineers now know exactly what performance to expect from current fiber systems and where real bottlenecks lie—information that shapes decisions about infrastructure upgrades and communication standards.