Description
Superconducting ion traps
Speaker:
Prof Atsushi Noguchi
The University of Tokyo & RIKEN
Abstract:
Recent experiments in trapped-ion platforms have demonstrated two-qubit gate fidelities reaching 99.99% using RF-based quantum gates. Because gate fidelity directly determines the achievable performance and scalability of quantum computers, a central challenge is how to realize such ultra-high-fidelity gates in a scalable architecture. To enhance the scalability of RF-based gates, we employ high-Q resonators fabricated from superconducting thin films. A high-Q resonator effectively enhances the circulating current in the circuit, enabling the generation of large magnetic-field gradients at the ion position with high efficiency relative to the input drive power. This approach allows strong spin–motion coupling while significantly reducing the required microwave power. Furthermore, by integrating superconducting cavities, the RF voltages for ion trapping can be achieved with substantially lower input power, providing a pathway toward energy-efficient and scalable trapped-ion systems. In addition to presenting detailed results of our superconducting-resonator–based RF gate architecture, we will also discuss our ongoing efforts toward an alternative platform: an electron-trap quantum computer, in which single electrons are confined in vacuum and coupled to superconducting circuits. This hybrid approach opens new possibilities for compact, strongly coupled, and scalable quantum information processing.