On July 2, 2026, researchers at ETH Zurich unveiled a groundbreaking method that utilizes a single ion to map 3D electromagnetic fields above semiconductor chips. This innovative approach aims to enhance the performance of quantum computers and sensors by precisely measuring electromagnetic interference.
Revolutionizing Electromagnetic Field Detection
The team, led by Professor Jonathan Home, has developed a technique that enables the creation of detailed three-dimensional maps of electric and magnetic fields near chip surfaces. This advancement is crucial as electromagnetic noise from chips can significantly disrupt quantum states, affecting device performance.
Using miniaturized traps, researchers can now position ions just above the chip surface, overcoming limitations faced by earlier, bulkier ion traps. This new method offers significant advantages in sensitivity and precision.
Methodology Behind the Measurement
The experimental setup involves a novel Penning trap, which combines static electric and magnetic fields for ion manipulation. This allows for arbitrary movement in three dimensions, unlike traditional methods relying on oscillating electric fields.
Doctoral student Tobias Sägesser explained, "This setup enables us to position ions with unprecedented accuracy, scanning areas as small as 200 by 200 micrometers and varying heights from 50 to 450 micrometers above the chip.”
Implications for Quantum Applications
The researchers achieved a record measurement sensitivity, detecting oscillating electric fields with an amplitude of just 10 nanovolts per meter. In comparison, the electromagnetic field from a mobile phone is approximately 10,000 times stronger even at considerable distances.
Home emphasized the importance of this method, stating, "For more than 30 years, researchers have tried to identify the sources of electric field noise near chips. Our approach allows for precise measurement with 3D spatial resolution, enabling better material characterization for quantum applications.”
- Key details of the research:
- Measurement time: 1 second
- Detection sensitivity: 10 nanovolts per meter
- Scan area: 200 by 200 micrometers
- Height variation: 50 to 450 micrometers above the chip
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