RIKEN Center for Quantum Computing Semiconductor Quantum Information Device Theory Research Team

Team Director: Daniel Loss (Ph.D.)

Japanese Page

Research Summary

Our team is working on the theory of a spin-based quantum computer. We design its CMOS-compatible components deriving from Si and Ge gated quantum dots. We focus on spin qubits that can be manipulated by electric fields through various spin-orbit interactions. Using advanced bandstructure models, we investigate the properties of holes and electrons confined in low-dimensional geometries. We search for optimal setups and ways of protecting the qubits from noise. We analyze perspective qubit interconnects which would allow assembling a large number of qubits into networks. Our ultimate goal is to identify fast, small, and scalable elements of the future quantum computer.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Engineering
Condensed Matter Physics I

Keywords

Quantum dots
Spin-based quantum information science
Qubit
Spin-orbit interaction
Quantum information processing

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

1. J. S. Rojas-Arias, A. Noiri, P. Stano, T. Nakajima, J, Yoneda, K. Takeda, T. Kobayashi, A. Sammak, G. Scappucci, D. Loss, S. Tarucha:
"Spatial noise correlations beyond nearest-neighbor in 28Si/SiGe spin qubits"
Phys. Rev. Applied 20, 054024 (2023)
2. J. Yoneda, J. S. Rojas-Arias, P. Stano, K. Takeda, A. Noiri, T. Nakajima, D. Loss, S. Tarucha:
"Noise-correlation spectrum for a pair of spin qubits in silicon"
Nature Physics 19, 1793 (2023)
3. A. Gutierrez-Rubio, J. S. Rojas-Arias, J. Yoneda, S. Tarucha, D. Loss, P. Stano:
"Bayesian estimation of correlation functions"
Phys. Rev. Research 4, 043166 (2022)
4. O. Malkoc, P. Stano, D. Loss:
"Charge-noise induced dephasing in silicon hole-spin qubits"
Phys. Rev. Lett. 129, 247701 (2022)
5. P. Stano, D. Loss:
"Review of performance metrics of spin qubits in gated semiconducting nanostructures"
Nat. Rev. Phys. 4, 672 (2022)
6. P. Stano, Ch-H. Hsu, L. C. Camenzind, L. Yu, D. M. Zumbühl and D. Loss:
"Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot"
Phys. Rev. B 99, 085308 (2019).
7. L. C. Camenzind, L. Yu, P. Stano, J. Zimmerman, A. C. Gossard, D. Loss and D. M. Zumbühl:
"Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot."
Nat. Commun. 9, 3454 (2018).
8. P. Stano, Ch-H. Hsu, M. Serina, L. C. Camenzind, L. Yu, D. M. Zumbühl and D. Loss:
"g-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field"
Phys. Rev. B 98, 195314 (2018).
9. O. Malkoc, P. Stano and D. Loss:
"Optimal geometry of lateral GaAs and Si/SiGe quantum dots for electrical control of spin qubits"
Phys. Rev. B 93, 235413 (2016).
10. *D. Loss and D. DiVincenzo:
"Quantum computation with quantum dots"
Phys. Rev. A 57, 120 (1998).

Lab Members

Principal investigator

Daniel Loss: Team Director

Core members

Peter Stano: Senior Research Scientist
Kazuki Nakazawa: Research Scientist
Juan Sebastian Rojas Arias: Postdoctoral Researcher

Contact Information

Main Research Building, Room 148
2-1 Hirosawa,
Wako, Saitama,
351-0198 Japan
Email: loss.daniel@riken.jp