Researchers at ETH Zurich have developed a method using a single ion to detect and map 3D electromagnetic fields above chip surfaces [1, 2].
This breakthrough addresses a critical barrier in the development of quantum computers and sensors. By creating a precise map of electromagnetic fields, scientists can better identify and mitigate the noise that often destabilizes quantum states, potentially leading to more stable and scalable quantum hardware [1, 2].
The team utilized a Penning-trap scanner featuring a single beryllium ion [1] to achieve this result. This approach allows for record sensitivity when measuring the environment immediately above a chip surface. Researchers said the method enables the creation of a three-dimensional map of these fields [2].
For decades, the industry has struggled with interference in trapped ion quantum computing. One researcher said that trapped ion quantum computing noise hit a 30-year wall [2] until the development of this new scanner.
By pinpointing exactly where and how electromagnetic noise occurs, engineers can redesign chip architectures to shield sensitive components more effectively. The ability to visualize these fields in 3D provides a level of detail previously unavailable to those building quantum-grade circuitry [1, 2].
Researchers at ETH Zurich said they have developed a method that uses a single ion to detect electromagnetic fields above a surface, and to create a three-dimensional map of them [2].
“Trapped ion quantum computing noise hit a 30-year wall”
The ability to map electromagnetic noise in three dimensions removes a primary blind spot in quantum chip fabrication. Because quantum bits are hypersensitive to their environment, this diagnostic tool allows researchers to move from theoretical noise models to empirical evidence, accelerating the transition from laboratory prototypes to commercially viable quantum computers.
