相关实验视频
Updated: Jun 11, 2025
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
12.8K
圆形里德伯格量子位的四极合与内部刺激
M Wirth1, C Hölzl1, A Götzelmann1
15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, <a href="https://ror.org/04vnq7t77">Universität Stuttgart</a>, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Physical review letters
|October 7, 2024
概括
研究人员使用石在圆形的里德伯格原子中展示了电四极合. 这促进了量子模拟,通过对离子核心进行操纵,使高度激发的量子比特能够通过光学控制来进行模拟.
科学领域:
- 量子模拟和计算量子模拟和计算
- 原子物理 原子物理
- 量子信息科学是一种量子信息科学.
背景情况:
- 二元原子在基于Rydberg原子的量子技术中提供了增强的控制,这是由于它们的第二个光学活性价值电子.
- 圆形的赖德伯格原子由于其长寿命的离子核激发和对自离子化的抵抗,特别有希望.
研究的目的:
- 实施和演示一个元稳定的离子核心水平和一个高n圆形的赖德伯格量子比特之间的电四极合.
- 通过离子核心操纵探索高度兴奋的圆形赖德伯格状态的光学控制,用于量子模拟.
主要方法:
- 采用双倍激发的Sr原子,在光学 tweezer 阵列中准备好.
- 实现了超稳定4D_{3/2}级别和高n (n=79) 圆形赖德伯格量子位之间的电四极合.
- 采用节拍节点拉姆齐干扰度与自旋回声来测量圆形赖德伯格量子位上的差异水平转移.
主要成果:
- 成功测量了kHz级别的差分水平变化,证明了电动四极合.
- 在100微秒以上的时间内实现了对Rydberg状态的连贯查询,在 tweezer trapping 的帮助下,并增强了循环状态的寿命.
- 在离子核上的连续光子散射下,没有观察到量子比特连贯性的显著损失.
结论:
- 展示了一种新方法,用于访问赖德伯格原子中的弱电子相互作用.
- 扩展了量子模拟工具箱,通过离子核心操纵实现圆形赖德伯格量子位的光学控制.
- 通过在光子散射下确认连贯性,为激光冷却和雷德伯格原子成像铺平了道路.
相关概念视频
01:27¹H NMR: Long-Range Coupling
1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.7K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
981
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
981
01:08Spin–Spin Coupling Constant: Overview
894
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
894
01:08NMR Spectroscopy: Spin–Spin Coupling
1.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.3K
01:17Spin–Spin Coupling: One-Bond Coupling
949
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
949
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K