Coherence protection of a silicon hole spin qubit with phase-modulated microwave driving
Abstract
Hole spins in silicon quantum dots are a promising platform for quantum computing due to their strong intrinsic spin-orbit coupling (SOC), which enables fast, all-electrical control. However, this coupling also increases their susceptibility to charge noise, thereby limiting coherence times. Moreover, holes in silicon are also affected by hyperfine interactions with residual nuclear spins in the silicon substrate, introducing a non-negligible source of low-frequency noise. Here, we implement a phase-modulated concatenated continuous driving (CCD) technique for hole spin qubits to suppress low-frequency noise through microwave phase modulation. This approach stabilizes Rabi oscillations and extends the oscillation decay time compared to the conventional method. Furthermore, by defining a qubit in the CCD frame, we achieve coherent control while simultaneously protecting the qubit from noise, confirming coherence protection during gate operations. These results demonstrate a viable route toward noise-robust hole spin qubits.
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BibTeX
@misc{ibad2026coherence,
title = {{Coherence protection of a silicon hole spin qubit with phase-modulated microwave driving}},
author = {Sayyid I. Ibad and Yusuke Sato and Takuma Kuno and Itaru Yanagi and Toshiyuki Mine and Ryuta Tsuchiya and Digh Hisamoto and Hiroyuki Mizuno and Raisei Mizokuchi and Jun Yoneda and Tetsuo Kodera},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.19696},
eprint = {2608.19696},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.19696},
}
RIS
TY - UNPB
TI - Coherence protection of a silicon hole spin qubit with phase-modulated microwave driving
AU - Sayyid I. Ibad
AU - Yusuke Sato
AU - Takuma Kuno
AU - Itaru Yanagi
AU - Toshiyuki Mine
AU - Ryuta Tsuchiya
AU - Digh Hisamoto
AU - Hiroyuki Mizuno
AU - Raisei Mizokuchi
AU - Jun Yoneda
AU - Tetsuo Kodera
PY - 2026
DA - 2026/10/25
PB - arXiv
DO - 10.48550/arxiv.2608.19696
UR - https://arxiv.org/abs/2608.19696
AB - Hole spins in silicon quantum dots are a promising platform for quantum computing due to their strong intrinsic spin-orbit coupling (SOC), which enables fast, all-electrical control. However, this coupling also increases their susceptibility to charge noise, thereby limiting coherence times. Moreover, holes in silicon are also affected by hyperfine interactions with residual nuclear spins in the silicon substrate, introducing a non-negligible source of low-frequency noise. Here, we implement a phase-modulated concatenated continuous driving (CCD) technique for hole spin qubits to suppress low-frequency noise through microwave phase modulation. This approach stabilizes Rabi oscillations and extends the oscillation decay time compared to the conventional method. Furthermore, by defining a qubit in the CCD frame, we achieve coherent control while simultaneously protecting the qubit from noise, confirming coherence protection during gate operations. These results demonstrate a viable route toward noise-robust hole spin qubits.
ER -