Seoul, Korea - 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.
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.
![Figure 1. The STM tip (Fe) operates the sensor qubit and romote qubits which creates the new multiple qubit platform.](https://www.ibs.re.kr:443/dext5data/2023/10/20231004_144221922_18044.png)
Figure 1. The STM tip (Fe) operates the sensor qubit and romote qubits which creates the new multiple qubit platform.
![Table 1. Current qubit platforms.](https://www.ibs.re.kr:443/dext5data/2023/10/20231004_144336650_96970.png)
Table 1. Current qubit platforms.
Notes for editors
- References
Yu Wang, Yi Chen, Hong T. Bui, Christoph Wolf, Masahiro Haze, Cristina Mier, Jinkyung Kim, Deung-Jang Choi, Christopher P. Lutz, Yujeong Bae, Soo-hyon Phark, Andreas J. Heinrich, An electron-spin qubit platform crafted atom-by-atom on a surface, Science 2023.
- Media Contact
For further information or to request media assistance, please contact Michelle Randall at the Center for Neuroscience Imaging Research, Institute for Basic Science (IBS) (randall.michelle@qns.science) or William I. Suh at the IBS Public Relations Team (willisuh@ibs.re.kr).
- About the Center for Quantum Nanoscience
The IBS Center for Quantum Nanoscience (QNS) was established in 2017 under director Andreas Heinrich's scientific leadership. With a team over 50 domestic and international members, it has become the global leader in the field of quantum-coherent nanoscience of atoms and molecules on surfaces. QNS is laying the foundation for future technology by exploring the use of quantum behavior atom by atom with highest precision to engineer the quantum future.
- About the Institute for Basic Science (IBS)
IBS was founded in 2011 by the government of the Republic of Korea with the sole purpose of driving forward the development of basic science in South Korea. IBS has 4 research institutes and 33 research centers as of June 2023. There are eleven physics, three mathematics, five chemistry, nine life science, two earth science, and three interdisciplinary research centers.