High-fidelity EDSR in Si/SiGe Wiggle Wells
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| Format: | Preprint |
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2026
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| _version_ | 1866910252339822592 |
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| author | Soomro, Hudaiba Kim, Minyoung Vivrekar, Avani Eriksson, M. A. Woods, Benjamin D. Friesen, Mark |
| author_facet | Soomro, Hudaiba Kim, Minyoung Vivrekar, Avani Eriksson, M. A. Woods, Benjamin D. Friesen, Mark |
| contents | Si/SiGe quantum wells that incorporate Ge concentration oscillations, known as long-period Wiggle Wells, have previously been shown to enhance the Dresselhaus spin-orbit coupling (SOC) of conduction-band electrons. Such intrinsic SOC is desirable when performing spin-qubit gate operations based on electric dipole spin resonance (EDSR) because it eliminates the need for external micromagnets. However, random-alloy disorder plays a key role in the valley physics of this materials system by spatially randomizing the valley phase $ϕ_{s,s}$, and has not been fully accounted for in recent EDSR analyses. Here, we show that alloy disorder affects EDSR in two main ways. First, the Rabi frequency $Ω$ acquires a dependence on the valley phase, given by $\cosϕ_{s,s}$, which causes spatial randomization of $Ω$. Despite this variability, we show that fast EDSR can be achieved at most locations across a given sample. Second, a new Rabi driving mechanism emerges, enabled by valley dipoles that result from disorder and the hybridization of ground and excited valley states in response to an EDSR driving field. This mechanism is dominant in regions of low valley splitting. Alloy disorder can therefore strengthen EDSR, but it can also cause gradients in $Ω$ that lead to dephasing in the rotating frame. We explore this problem by first identifying "sweet spots," where EDSR is relatively insensitive to electric-field fluctuations. We then show that high-fidelity Rabi oscillations can be achieved in the presence of realistic charge noise. Our results demonstrate that the Wiggle Well is a promising platform for high-quality, micromagnet-free gate operations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_24790 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-fidelity EDSR in Si/SiGe Wiggle Wells Soomro, Hudaiba Kim, Minyoung Vivrekar, Avani Eriksson, M. A. Woods, Benjamin D. Friesen, Mark Mesoscale and Nanoscale Physics Quantum Physics Si/SiGe quantum wells that incorporate Ge concentration oscillations, known as long-period Wiggle Wells, have previously been shown to enhance the Dresselhaus spin-orbit coupling (SOC) of conduction-band electrons. Such intrinsic SOC is desirable when performing spin-qubit gate operations based on electric dipole spin resonance (EDSR) because it eliminates the need for external micromagnets. However, random-alloy disorder plays a key role in the valley physics of this materials system by spatially randomizing the valley phase $ϕ_{s,s}$, and has not been fully accounted for in recent EDSR analyses. Here, we show that alloy disorder affects EDSR in two main ways. First, the Rabi frequency $Ω$ acquires a dependence on the valley phase, given by $\cosϕ_{s,s}$, which causes spatial randomization of $Ω$. Despite this variability, we show that fast EDSR can be achieved at most locations across a given sample. Second, a new Rabi driving mechanism emerges, enabled by valley dipoles that result from disorder and the hybridization of ground and excited valley states in response to an EDSR driving field. This mechanism is dominant in regions of low valley splitting. Alloy disorder can therefore strengthen EDSR, but it can also cause gradients in $Ω$ that lead to dephasing in the rotating frame. We explore this problem by first identifying "sweet spots," where EDSR is relatively insensitive to electric-field fluctuations. We then show that high-fidelity Rabi oscillations can be achieved in the presence of realistic charge noise. Our results demonstrate that the Wiggle Well is a promising platform for high-quality, micromagnet-free gate operations. |
| title | High-fidelity EDSR in Si/SiGe Wiggle Wells |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2605.24790 |