TY - JOUR
T1 - Coherent spin control of s-, p-, d- and f-electrons in a silicon quantum dot
AU - Leon, Ross
AU - Yang, Chih Heng
AU - Hwang, Jason
AU - Camirand Lemyre, Julien
AU - Tanttu, Tuomo
AU - Huang, Wister
AU - Chan, Kok Wai
AU - Tan, Kuan
AU - Hudson, Fay
AU - Itoh, Kohei
AU - Morello, Andrea
AU - Laucht, Arne
AU - Pioro-Ladriere, Michel
AU - Saraiva, Andre
AU - Dzurak, Andrew S.
PY - 2020/2/11
Y1 - 2020/2/11
N2 - Once the periodic properties of elements were unveiled, chemical behaviour could be understood in terms of the valence of atoms. Ideally, this rationale would extend to quantum dots, and quantum computation could be performed by merely controlling the outer-shell electrons of dot-based qubits. Imperfections in semiconductor materials disrupt this analogy, so real devices seldom display a systematic many-electron arrangement. We demonstrate here an electrostatically confined quantum dot that reveals a well defined shell structure. We observe four shells (31 electrons) with multiplicities given by spin and valley degrees of freedom. Various fillings containing a single valence electron—namely 1, 5, 13 and 25 electrons—are found to be potential qubits. An integrated micromagnet allows us to perform electrically-driven spin resonance (EDSR), leading to faster Rabi rotations and higher fidelity single qubit gates at higher shell states. We investigate the impact of orbital excitations on single qubits as a function of the dot deformation and exploit it for faster qubit control.
AB - Once the periodic properties of elements were unveiled, chemical behaviour could be understood in terms of the valence of atoms. Ideally, this rationale would extend to quantum dots, and quantum computation could be performed by merely controlling the outer-shell electrons of dot-based qubits. Imperfections in semiconductor materials disrupt this analogy, so real devices seldom display a systematic many-electron arrangement. We demonstrate here an electrostatically confined quantum dot that reveals a well defined shell structure. We observe four shells (31 electrons) with multiplicities given by spin and valley degrees of freedom. Various fillings containing a single valence electron—namely 1, 5, 13 and 25 electrons—are found to be potential qubits. An integrated micromagnet allows us to perform electrically-driven spin resonance (EDSR), leading to faster Rabi rotations and higher fidelity single qubit gates at higher shell states. We investigate the impact of orbital excitations on single qubits as a function of the dot deformation and exploit it for faster qubit control.
UR - http://www.scopus.com/inward/record.url?scp=85079334443&partnerID=8YFLogxK
U2 - 10.1038/s41467-019-14053-w
DO - 10.1038/s41467-019-14053-w
M3 - Article
C2 - 32047151
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 797
ER -