长寿的挤压地面状态在量子自旋合奏
Lin Xin1, Maryrose Barrios1, Julia T Cohen1
1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Physical review letters
|October 13, 2023
概括
研究人员使用一种新的技术在原子波斯-爱因斯坦凝结体中创建了稳定的旋转挤压基本状态. 这些状态表现出显著的挤压和稳定性,为量子技术提供了新的可能性.
科学领域:
- 原子,分子和光学物理学
- 量子多体物理学 量子多体物理学
- 量子信息科学 量子信息科学
背景情况:
- 产生非经典物质状态对于量子技术至关重要.
- 原子斯-爱因斯坦凝聚物 (BEC) 是量子状态准备的有希望的平台.
- 以前的方法通常涉及动态过程,如通过量子相位过渡进行火.
研究的目的:
- 为了产生时间静止的旋转,在旋转-1的斯-爱因斯坦凝结体中挤压了基本状态.
- 探索一种新型的非adiabatic技术,以准备这些状态在量子临界点附近.
- 描述产生的状态的挤压特性和长期稳定性.
主要方法:
- 利用一种新的非adiabatic技术调整一个原子旋转-1波斯-爱因斯坦凝聚物在其量子临界点附近.
- 准备的旋转挤压地面状态是时间静止的.
- 测量了挤压的程度及其随时间的演变.
主要成果:
- 成功生成了旋转挤压的基本状态,挤压6-8dB.
- 证明了这些静止状态的恒定方程挤压角度.
- 观察到压缩在2秒内逐渐减少,归因于来自原子密度损失的哈密尔顿调整,而不需要额外的脱凝模型.
结论:
- 这种新的非adiabatic技术提供了一种强大的方法,用于创建稳定的旋转挤压的基本状态.
- 这些状态表现出了显著的抵御脱节的弹性,正如其衰变的建模所证明的那样.
- 这些发现为使用原子BEC提高精度测量和量子信息处理铺平了道路.
相关概念视频
Atomic Nuclei: Nuclear Spin State Overview
978
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
978
Atomic Nuclei: Nuclear Relaxation Processes
661
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
661
Atomic Nuclei: Nuclear Spin State Population Distribution
993
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
993
Atomic Nuclei: Types of Nuclear Relaxation
322
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
322
Spin–Spin Coupling Constant: Overview
942
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...
942
The Pauli Exclusion Principle
38.1K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
38.1K


