About us
The Information Technology industry’s ability to shrink components to make computational devices more powerful is running into serious roadblocks. The strong influence of quantum mechanical effects takes over as device components shrink to the atomic scale. As a result, harnessing quantum effects for computation potentially offers a powerful new route to solving real world computational problems.
The Center for Quantum Nanoscience (QNS) at Ewha Womans University aims to investigate quantum effects in solid state systems to further our understanding of this crucially important, but as of yet, poorly understood basic research field. Our goal is to become recognized as the best place to perform quantum research on the atomic scale in a solid-state environment and be a destination for leading domestic and international researchers.
What is Quantum Nanoscience?
Quantum nanoscience is a novel research field at the intersection of quantum and nanoscience. Quantum science studies the quantum mechanical properties of matter and Molecular Nanoscience focuses on materials at the atomic scale. QNS combines both of these by investigating the quantum behavior of atoms and molecules on surfaces. In this endeavor, we employ specialized tools that allow us to see and touch atoms and move them into desired atomic positions. This allows us to build engineered structures consisting of several atoms.
The Center for Quantum Nanoscience focuses on a basic exploration of our world on the atomic scale with an eye towards harnessing these quantum behaviors for high-density data storage and quantum computation in the long term.
The Center for Quantum Nanoscience focuses on a basic exploration of our world on the atomic scale with an eye towards harnessing these quantum behaviors for high-density data storage and quantum computation in the long term.
Our Goals
- Achieving full control of the quantum states of atoms and molecules on clean surfaces and near interfaces
- Exploring both theoretically and experimentally, systems and strategies for coherent manipulation of quantum nanostructures, with emphasis on understanding and mitigating decoherence
- Demonstrating and optimizing the use of single atoms and molecules as quantum bits for quantum computation applications
- Investigating the transition from quantum to classical behavior, including the quantum measurement problem
Highlights
Magnetic Resonance Imaging of Single Atoms on a Surface

The two elements that were investigated in this work, iron and titanium, are both magnetic. Through precise preparation of the sample, the atoms where readily visible in the microscope. The researchers then used the microscope’s tip like an MRI machine to map the three-dimensional magnetic field created by the atoms with unprecedented resolution. In order to do so, they attached another spin cluster to the sharp metal tip of their microscope. Similar to everyday magnets, the two spins attract or repel each other depending on their relative position. By sweeping the tip spin cluster over the atom on the surface, the researchers were able to map out the magnetic interaction.
Lead author, Dr. Philip Willke of QNS says: “It turns out that the magnetic interaction we measured depends on the properties of both spins, the one on the tip and the one on the sample. For example, the signal that we see for iron atoms is vastly different from that for titanium atoms. This allows us to distinguish different kinds of atoms by their magnetic field signature and makes our technique very powerful.”
Breakthrough in Accessing the Tiny Magnet within the Core of a Single Atom

In order to detect the presence of a nuclear spin within the core of a single atom, the team made use of the hyperfine interaction. This phenomenon describes the coupling between a single atom’s nuclear spin and its electron counterpart, that is generally much easier to access. Dr. Philip Willke of the Center for Quantum Nanoscience (QNS), first author of the study, says: “We found that the hyperfine interaction of an atom changed when we moved it to a different position on the surface or if we moved other atoms next to it. In both cases, the electronic structure of the atom changes and the nuclear spin allows us to detect that.
A step closer to single-atom data storage

One Atom Bit
One bit of digital information can now be successfully stored in an individual atom, according to a study just published in Nature. Current commercially-available magnetic memory devices require approximately one million atoms to do the same. Andreas Heinrich, newly appointed Director of the Center for Quantum Nanoscience, within the Institute of Basic Science (IBS, South Korea), led the research effort that made this discovery at IBM Almaden Research Center (USA). This result is a breakthrough in the miniaturization of storage media and has the potential to serve as a basis for quantum computing.A Quantum Sensor Made from Individual Iron Atoms

This work is the first application of a recent breakthrough invention of the same team, which demonstrated electron spin resonance – a quantum mechanical measurement of single spins – in the STM. “We believe that this quantum sensor can be used to measure the spins in complex molecules with atomic-scale spatial resolution, sort of like a nano-GPS”, suggests Taeyoung Choi, first author of the recent study.
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Check all QNS Highlights →