تقرير
Violating Bell's inequality in gate-defined quantum dots
| العنوان: | Violating Bell's inequality in gate-defined quantum dots |
|---|---|
| المؤلفون: | Steinacker, Paul, Tanttu, Tuomo, Lim, Wee Han, Stuyck, Nard Dumoulin, Feng, MengKe, Serrano, Santiago, Vahapoglu, Ensar, Su, Rocky Y., Huang, Jonathan Y., Jones, Cameron, Itoh, Kohei M., Hudson, Fay E., Escott, Christopher C., Morello, Andrea, Saraiva, Andre, Yang, Chih Hwan, Dzurak, Andrew S., Laucht, Arne |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics, 81P68, 81-05 |
| الوصف: | Superior computational power promised by quantum computers utilises the fundamental quantum mechanical principle of entanglement. However, achieving entanglement and verifying that the generated state does not follow the principle of local causality has proven difficult for spin qubits in gate-defined quantum dots, as it requires simultaneously high concurrence values and readout fidelities to break the classical bound imposed by Bell's inequality. Here we employ heralded initialization and calibration via gate set tomography (GST), to reduce all relevant errors and push the fidelities of the full 2-qubit gate set above 99 %, including state preparation and measurement (SPAM). We demonstrate a 97.17 % Bell state fidelity without correcting for readout errors and violate Bell's inequality with a Bell signal of S = 2.731 close to the theoretical maximum of $2\sqrt{2}$. Our measurements exceed the classical limit even at elevated temperatures of 1.1 K or entanglement lifetimes of 100 $\mu s$. Comment: 19 pages, 5 main figures, 9 extended data figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.15778 |
| رقم الأكسشن: | edsarx.2407.15778 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |