# Atsushi Noguchi

Team Leader, Hybrid quantum circuits Research Team

## Outline

Quantum controls quantum. Our research is aimed at hybridizing different quantum systems to create new functionalities. For example, a superconducting resonator can hold a photon for a long time, and this photon can be controlled using a superconducting qubit to construct an error-corrected logic qubit. In addition, our team is focusing on trapped electron systems where we can hold their quantum state for an even longer time. The electrons are trapped using a quadrupole electric field, which is widely used as an ion trap, and we can realize a quantum system that is completely isolated from the environment. Because of the electron's low mass, the oscillations of the trapped electron constitute a large electric dipole, which also operates at high speed. The large electric dipole can be coupled with a superconducting qubit, resulting in a hybrid quantum system with even higher performance.

In this way, we not only combine different quantum systems as they are, but also integrate their control technologies and excellent experimental technologies to develop higher-performance quantum technologies.

## Research Theme

・Logical qubit with superconducting circuits.

・Quantum manipulations of trapped electrons.

・Superconducting ion trap

## Representative Research Results

・Aharonov-Bohm effect in the tunnelling of a quantum rotor in a a linear Paul trap,

A. Noguchi, Y. Shikano, K. Toyoda, S. Urabe, Nature Communications 5, 3868 (2014)

・Ground state cooling of a quantum electromechanical system with a silicon nitride membrane

in a 3D loop-gap cavity, A. Noguchi, R. Yamazaki, M. Ataka, H. Fujita, Y. Tabuchi, T. Ishikawa, K.

Usami, Y. Nakamura, New Journal of Physics 18, 103036 (2016)

・Qubit-assisted transduction for a detection of surface acoustic waves near the quantum limit,

Atsushi Noguchi, Rekishu Yamazaki, Yutaka Tabuchi, Yasunobu Nakamura,

Physical review letters 119, 180505 (2017)

・Single-photon quantum regime of artificial radiation pressure on a surface acoustic wave

resonator, A. Noguchi, R. Yamazaki, Y. Tabuchi, Y. Nakamura, Nature Communications 11, 1183

(2020)

・Fast parametric two-qubit gates with suppressed residual interaction using a parity-violated

superconducting qubit, A. Noguchi, A. Osada, S. Masuda, S. Kono, K. Heya, S. Piotr Wolski, H.

Takahashi, T. Sugiyama, D. Lachance-Quirion, Y. Nakamura,

Physical Review A 102, 062408 (2020).

CAD image for an electron trap

## Related Links

・Noguchi lab. | Lab page at UT

・ Atsushi Noguchi | Personal page