Quantum technology opens up new avenues for computer miniaturization. Researchers at Fraunhofer in Germany have recently developed a quantum sensor for micro-magnetic field applications that can be used for future computer hard disk recognition.
Integrated circuits are becoming more and more complex. The latest Pentium processor now holds about 30 million transistors. The magnetic structure in the hard drive is only identifiable from 10 to 20 nanometers and is smaller than the flu virus with a diameter of 80 to 120 nanometers. The quantum sensor developed by the Fraunhofer Institute for Solid State Physics (IAF) researchers and colleagues at the Max Planck Institute for Solid State Research can be applied to the precise identification of computer hard disks in small magnetic fields. This quantum sensor is only a nitrogen atom and the carrier material is a synthetic diamond.
The Fraunhofer IAF has developed an optimized device for the manufacture of synthetic diamonds decades ago. But new quantum sensors require particularly pure crystals. To this end, researchers have further improved the manufacturing process by purifying methane gas with a zirconium filter to obtain an ultra-clean synthetic diamond coating.
There are two ways to make a structure with only the size of a nitrogen atom: directly implant a single nitrogen atom, or add nitrogen at the last step of diamond growth. This time, the research team produced a very fine diamond tip by oxygen plasma etching in a clean laboratory, which introduced nitrogen atoms between adjacent vacancies in the lattice. This center of nitrogen vacancy is the actual sensor that emits light when illuminated with a laser beam and microwaves, and changes in light as it approaches the magnetic field.
Experts have measured the electron spin resonance spectrum by optical detection, indicating that the nitrogen atom sensor has high accuracy in detecting nano-scale magnetic fields and has amazing application potential. For example, it can be used as a quantum sensor to control the quality of a hard disk drive and detect defective data segments in massive data. Fraunhofer IAF expert Christoph said the quantum sensor can also measure brain waves.
This quantum sensor measures the tiny magnetic fields we see on the next generation of hard drives with great precision. Similarly, its perception of the magnetic field can also avoid the inaccurate consequences of using electrodes to measure brain waves. This magical tool can also give us new material states and material phases that we have never seen before. Even in the military, mature quantum sensing technology will bring many benefits.
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