تقرير
Realization of a $CQ_3$ Qubit: energy spectroscopy and coherence
| العنوان: | Realization of a $CQ_3$ Qubit: energy spectroscopy and coherence |
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| المؤلفون: | Kratochwil, Benedikt, Koski, Jonne V., Landig, Andreas J., Scarlino, Pasquale, Abadillo-Uriel, José C., Reichl, Christian, Coppersmith, Susan N., Wegscheider, Werner, Friesen, Mark, Wallraff, Andreas, Ihn, Thomas, Ensslin, Klaus |
| المصدر: | Phys. Rev. Research 3, 013171 (2021) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | The energy landscape of a single electron in a triple quantum dot can be tuned such that the energy separation between ground and excited states becomes a flat function of the relevant gate voltages. These so-called sweet spots are beneficial for charge coherence, since the decoherence effects caused by small fluctuations of gate voltages or surrounding charge fluctuators are minimized. We propose a new operation point for a triple quantum dot charge qubit, a so-called $CQ_3$-qubit, having a third order sweet spot. We show strong coupling of the qubit to single photons in a frequency tunable high-impedance SQUID-array resonator. In the dispersive regime we investigate the qubit linewidth in the vicinity of the proposed operating point. In contrast to the expectation for a higher order sweet spot, we there find a local maximum of the linewidth. We find that this is due to a non-negligible contribution of noise on the quadrupolar detuning axis not being in a sweet spot at the proposed operating point. While the original motivation to realize a low-decoherence charge qubit was not fulfilled, our analysis provides insights into charge decoherence mechanisms relevant also for other qubits. Comment: 12 pages, 11 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.3.013171 |
| URL الوصول: | http://arxiv.org/abs/2006.05883 |
| رقم الأكسشن: | edsarx.2006.05883 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevResearch.3.013171 |
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