Mitigation of exchange cross-talk in dense quantum dot arrays
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866911209742139392 |
|---|---|
| author | Jirovec, Daniel Fariña, Pablo Cova Reale, Stefano Oosterhout, Stefan D. Zhang, Xin de Snoo, Sander Sammak, Amir Scappucci, Giordano Veldhorst, Menno Vandersypen, Lieven M. K. |
| author_facet | Jirovec, Daniel Fariña, Pablo Cova Reale, Stefano Oosterhout, Stefan D. Zhang, Xin de Snoo, Sander Sammak, Amir Scappucci, Giordano Veldhorst, Menno Vandersypen, Lieven M. K. |
| contents | Coupled spins in semiconductor quantum dots are a versatile platform for quantum computing and simulations of complex many-body phenomena. However, on the path of scale-up, cross-talk from densely packed electrodes poses a severe challenge. While cross-talk onto the dot potentials is nowadays routinely compensated for, cross-talk on the exchange interaction is much more difficult to tackle because it is not always directly measurable. Here we propose and implement a way of characterizing and compensating cross-talk on adjacent exchange interactions by following the singlet-triplet avoided crossing in Ge. We show that we can easily identify the barrier-to-barrier cross-talk element without knowledge of the particular exchange value in a 2x4 quantum dot array. We uncover striking differences among these cross-talk elements which can be linked to the geometry of the device and the barrier gate fan-out. We validate the methodology by tuning up four-spin Heisenberg chains. The same methodology should be applicable to longer chains of spins and to other semiconductor platforms in which mixing of the singlet and the lowest-energy triplet is present or can be engineered. Additionally, this procedure is well suited for automated tuning routines as we obtain a stand-out feature that can be easily tracked and directly returns the magnitude of the cross-talk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_23846 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mitigation of exchange cross-talk in dense quantum dot arrays Jirovec, Daniel Fariña, Pablo Cova Reale, Stefano Oosterhout, Stefan D. Zhang, Xin de Snoo, Sander Sammak, Amir Scappucci, Giordano Veldhorst, Menno Vandersypen, Lieven M. K. Mesoscale and Nanoscale Physics Coupled spins in semiconductor quantum dots are a versatile platform for quantum computing and simulations of complex many-body phenomena. However, on the path of scale-up, cross-talk from densely packed electrodes poses a severe challenge. While cross-talk onto the dot potentials is nowadays routinely compensated for, cross-talk on the exchange interaction is much more difficult to tackle because it is not always directly measurable. Here we propose and implement a way of characterizing and compensating cross-talk on adjacent exchange interactions by following the singlet-triplet avoided crossing in Ge. We show that we can easily identify the barrier-to-barrier cross-talk element without knowledge of the particular exchange value in a 2x4 quantum dot array. We uncover striking differences among these cross-talk elements which can be linked to the geometry of the device and the barrier gate fan-out. We validate the methodology by tuning up four-spin Heisenberg chains. The same methodology should be applicable to longer chains of spins and to other semiconductor platforms in which mixing of the singlet and the lowest-energy triplet is present or can be engineered. Additionally, this procedure is well suited for automated tuning routines as we obtain a stand-out feature that can be easily tracked and directly returns the magnitude of the cross-talk. |
| title | Mitigation of exchange cross-talk in dense quantum dot arrays |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.23846 |