In a new study, researchers demonstrate ground-based measurements of quantum states sent by a laser aboard a satellite 38,000 kilometers above Earth. This is the first time that quantum states have been measured so carefully from so far away.
“We were quite surprised by how well the quantum states survived traveling through the atmospheric turbulence to a ground station,” said Christoph Marquardt from the Max Planck Institute for the Science of Light, Germany. “The paper demonstrates that technology on satellites, already space-proof against severe environmental tests, can be used to achieve quantum-limited measurements, thus making a satellite quantum communication network possible. This greatly cuts down on development time, meaning it could be possible to have such a system as soon as five years from now.”
In a new study, researchers demonstrate ground-based measurements of quantum states sent by a laser aboard a satellite 38,000 kilometers above Earth. This is the first time that quantum states have been measured so carefully from so far away.
“We were quite surprised by how well the quantum states survived traveling through the atmospheric turbulence to a ground station,” said Christoph Marquardt from the Max Planck Institute for the Science of Light, Germany. “The paper demonstrates that technology on satellites, already space-proof against severe environmental tests, can be used to achieve quantum-limited measurements, thus making a satellite quantum communication network possible. This greatly cuts down on development time, meaning it could be possible to have such a system as soon as five years from now.”
A satellite-based quantum-based encryption network would provide an extremely secure way to encrypt data sent over long distances. Developing such a system in just five years is an extremely fast timeline since most satellites require around 10 years of development. Normally, every component — from computers to screws — must be tested and approved to work in the harsh environmental conditions of space and must survive the gravitational changes experienced during the launch.
Continue reading at The Optical Society
Image: From the ground, researchers measured laser signals that originated from a satellite and traveled through Earth’s gravitational potential and the turbulent atmosphere. The successful characterization of quantum features under such conditions is a precondition for the implementation of a global quantum communication network using satellites that would link metropolitan area quantum networks on the ground. Credit: Picture of the Earth: Google, picture of the satellite: ESA.
