A New Qubit Platform is Created Atom by Atom
October 9, 2023 | IBSEstimated reading time: 2 minutes

Researchers at the IBS Center for Quantum Nanoscience (QNS) at Ewha Womans University have accomplished a groundbreaking step forward in quantum information science. In partnership with teams from Japan, Spain, and the US, they created a novel electron-spin qubit platform, assembled atom-by-atom on a surface. This breakthrough was published in the journal Science on 2023/10/06.
Figure 1. The STM tip (Fe) operates the sensor qubit and romote qubits which creates the new multiple qubit platform.
Unlike previous atomic quantum devices on surfaces where only a single qubit could be controlled, the researchers at QNS successfully demonstrated the ability to control multiple qubits simultaneously, enabling the application of single-, two-, and three-qubit gates.
Qubits, the fundamental units of quantum information, are key to quantum applications such as quantum computing, sensing, and communication. PHARK Soo-hyon, one of the QNS principal investigators, highlights the significance of this project. "To date, scientists have only been able to create and control a single qubit on a surface, making this a major step forward towards multi-qubit systems," he stated.
Led by BAE Yujeong, PHARK Soo-hyon, and director Andreas HEINRICH, QNS developed this novel platform, which consists of individual magnetic atoms placed on a pristine surface of a thin insulator. These atoms can be precisely positioned using the tip of a scanning tunneling microscope (STM) and manipulated with the assistance of electron spin resonance (ESR-STM). This atomic-scale control has allowed researchers to manipulate quantum states coherently. They also established the possibility of controlling remote qubits, opening the path to scaling up to tens or hundreds of qubits in a defect-free environment.
BAE Yujeong pointed out, “It is truly amazing that we can now control the quantum states of multiple individual atoms on surfaces at the same time”. The atomic-scale precision of this platform allows for the remote manipulation of the atoms to perform qubit operations individually, without moving the tip of the STM.
This research marks a significant departure from other qubit platforms, such as photonic devices, ion and atom traps, and superconducting devices. One of the unique benefits of this surface-based electron-spin approach is the myriad of available spin species and the vast variety of two-dimensional geometries that can be precisely assembled.
Looking forward, the researchers anticipate quantum sensing, computation, and simulation protocols using these precisely assembled atomic architectures. Altogether, the work by the QNS researchers is expected to usher in a new era of atomic-scale control in quantum information science, cementing Korea’s position as a global leader in the field.
Testimonial
"In a year when every marketing dollar mattered, I chose to keep I-Connect007 in our 2025 plan. Their commitment to high-quality, insightful content aligns with Koh Young’s values and helps readers navigate a changing industry. "
Brent Fischthal - Koh YoungSuggested Items
Keysight Installs World’s Largest Commercial Quantum Control System at AIST’s Leading-Edge G-QuAT Center
07/30/2025 | Keysight TechnologiesKeysight Technologies, Inc. has delivered the world’s largest1 commercial quantum control system (QCS) to the National Institute of Advanced Industrial Science and Technology (AIST) in Japan.
Diraq Secures CTCP Funding to Uncover Energy Applications
07/28/2025 | DiraqDiraq has been awarded AU$500,000 in funding to explore how quantum computers can enhance the performance, sustainability and security of energy networks.
Honeywell Awarded U.S. Government Contracts to Develop Quantum Sensor-Based Navigation Systems
07/21/2025 | HoneywellHoneywell has been selected by the U.S. Department of Defense’s (DOD) Defense Innovation Unit (DIU) to participate in the Transition of Quantum Sensing (TQS) program.
EIFO, the Novo Nordisk Foundation Acquire the World's Most Powerful Quantum Computer
07/17/2025 | PRNewswireThe commercial and geopolitical stakes in quantum technology are immense, and significant technological advances have been made over the past decade.
indie’s LXM-U Laser Powers Next-Gen Quantum Technologies with Ultra-Low Noise Performance
07/14/2025 | indie Semiconductorindie, an automotive solutions innovator, is rapidly gaining industry adoption in its photonics portfolio, with indie’s latest ultra-low noise LXM-U lasers enabling next-generation quantum applications by delivering industry-leading frequency stability and integration flexibility.