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pro vyhledávání: '"Smith, M C"'
We report the achievement of single-qubit gates with sub-part-per-million error rates, in a trapped-ion $^{43}$Ca$^{+}$ hyperfine clock qubit. We explore the speed/fidelity trade-off for gate times $4.4\leq t_{g}\leq35~\mu$s, and benchmark a minimum
Externí odkaz:
http://arxiv.org/abs/2412.04421
Quantum state preparation for trapped-ion qubits often relies on high-quality circularly-polarised light, which may be difficult to achieve with chip-based integrated optics technology. We propose and implement a hybrid optical/microwave scheme for i
Externí odkaz:
http://arxiv.org/abs/2406.14448
A leading approach to implementing small-scale quantum computers has been to use laser beams, focused to micron spot sizes, to address and entangle trapped ions in a linear crystal. Here we propose a method to implement individually-addressed entangl
Externí odkaz:
http://arxiv.org/abs/2309.02125
Publikováno v:
Phys. Rev. Lett. 131, 120601 (2023)
We use electronic microwave control methods to implement addressed single-qubit gates with high speed and fidelity, for $^{43}\text{Ca}^{+}$ hyperfine "atomic clock" qubits in a cryogenic (100K) surface trap. For a single qubit, we benchmark an error
Externí odkaz:
http://arxiv.org/abs/2305.06725
Autor:
Wang, Jiangtao, Fu, Jian-Ning, Zong, Weikai, Smith, M. C., De Cat, Peter, Shi, Jianrong, Luo, Ali, Zhang, Haotong, Frasca, A., Corbally, C. J., Molenda-Żakowicz, J., Catanzaro, G., Gray, R. O., Wang, Jiaxin, Pan, Yang
The LAMOST-\textit{K}2 (L\textit{K}2) project, initiated in 2015, aims to collect low-resolution spectra of targets in the \textit{K}2 campaigns, similar to LAMOST-\textit{Kepler} project. By the end of 2018, a total of 126 L\textit{K}2 plates had be
Externí odkaz:
http://arxiv.org/abs/2010.06827
Autor:
Yuan, Zhen, Myeong, G. C., Beers, Timothy C., Evans, N. Wyn, Lee, Young Sun, Banerjee, Projjwal, Gudin, Dmitrii, Hattori, Kohei, Li, Haining, Matsuno, Tadafumi, Placco, Vinicius M., Smith, M. C., Whitten, Devin D., Zhao, Gang
We search for dynamical substructures in the LAMOST DR3 very metal-poor (VMP) star catalog. After cross-matching with Gaia DR2, there are 3300 VMP stars with available high-quality astrometric information that have halo-like kinematics. We apply a me
Externí odkaz:
http://arxiv.org/abs/1910.07538
Autor:
Yuan, Zhen, Smith, M. C., Xue, Xiang-Xiang, Li, Jing, Liu, Chao, Wang, Yue, Li, Lu, Chang, Jiang
We use a novel cluster identification tool StarGO to explore the metal poor ([Fe/H] $<$ -1.5) outer stellar halo (d $>$ 15 kpc) of the Milky Way using data from Gaia, LAMOST and SDSS. Our method is built using an unsupervised learning algorithm, a se
Externí odkaz:
http://arxiv.org/abs/1902.05248
Akademický článek
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We develop a new method StarGO (Stars' Galactic Origin) to identify the galactic origins of halo stars using their kinematics. Our method is based on self-organizing map (SOM), which is one of the most popular unsupervised learning algorithms. StarGO
Externí odkaz:
http://arxiv.org/abs/1806.06341
We present a new analysis of the LAMOST DR1 survey spectral database performed with the code SP_Ace, which provides the derived stellar parameters T$_{\rm eff}$, log (g), [Fe/H], and [$\alpha$/Fe] for 1,097,231 stellar objects. We tested the reliabil
Externí odkaz:
http://arxiv.org/abs/1803.02016