تقرير
Protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a quantum-dot loop
| العنوان: | Protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a quantum-dot loop |
|---|---|
| المؤلفون: | Kolok, Baksa, Pályi, András |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics |
| الوصف: | A quantum system constrained to a degenerate energy eigenspace can undergo a nontrival time evolution upon adiabatic driving, described by a non-Abelian Berry phase. This type of dynamics may provide logical gates in quantum computing that are robust against timing errors. A strong candidate to realize such holonomic quantum gates is an electron or hole spin qubit trapped in a spin-orbit-coupled semiconductor, whose twofold Kramers degeneracy is protected by time-reversal symmetry. Here, we propose and quantitatively analyze protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a loop of quantum dots. One of these protocols allows to characterize the local internal Zeeman field directions in the dots of the loop. We expect a near-term realisation of these protocols, as all key elements have been already demonstrated in spin-qubit experiments. These experiments would be important to assess the potential of holonomic quantum gates for spin-based quantum information processing. Comment: 11 pages main text, +5 pages appendix and bibliography, 9 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2308.05455 |
| رقم الأكسشن: | edsarx.2308.05455 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |