Precise determination of h/m_Rb using Bloch oscillations and atomic interferometry: a mean to deduce the fine structure constant

利用多路径 Stuckelberg 原子干涉术研究 Bloch 振荡相位

Bloch Oscillation Phases investigated by Multi-path Stuckelberg Atom Interferometry

本文构建多路径 Stuckelberg 原子干涉仪，测量最高 100 个光子反冲动量转移下 Bloch 振荡的相位演化，并结合单粒子 Schrodinger 模拟验证其相干性与精密测量应用条件。

基于幻福克-布洛赫能带结构的连续囚禁物质波干涉测量

Continuously trapped matter-wave interferometry in magic Floquet-Bloch band structures

针对囚禁物质波干涉测量中阱噪声引入的系统误差问题，提出本征抗噪福克工程平台，利用振幅调制光学晶格的幻福克-布洛赫能带结构实现马赫-曾德尔干涉力传感，实验验证其抗噪性与可编程性，为量子力传感器提供新方案。

Combination of Bloch oscillations with a Ramsey-Bordé interferometer : new determination of the fine structure constant

We report a new experimental scheme which combines atom interferometry with Bloch oscillations to provide a new measurement of the ratio $h/m_{\mathrm{Rb}}$. By using Bloch oscillations, we impart to the atoms up to 1600 recoil momenta and thus we improve the accuracy on the recoil velocity measurement. The deduced value of $h/m_{\mathrm{Rb}}$ leads to a new determination of the fine structure constant $α^{-1}=137.035 999 45 (62)$ with a relative uncertainty of $4.6\times 10^{-9}$. The comparison of this result with the value deduced from the measurement of the electron anomaly provides the mo…

Atom interferometry based on light pulses : application to the high precision measurement of the ratio h/m and the determination of the fine structure constant

In this paper we present a short overview of atom interferometry based on light pulses. We discuss different implementations and their applications for high precision measurements. We will focus on the determination of the ratio h/m of the Planck constant to an atomic mass. The measurement of this quantity is performed by combining Bloch oscillations of atoms in a moving optical lattice with a Ramsey-Bordé interferometer.

A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic

We report an accurate measurement of the recoil velocity of Rb atoms based on Bloch oscillations in a vertical accelerated optical lattice. We transfer about 900 recoil momenta with an efficiency of 99.97 % per recoil. A set of 72 measurements of the recoil velocity, each one with a relative uncertainty of about 33 ppb in 20 min integration time, leads to a determination of the fine structure constant alpha with a statistical relative uncertainty of 4.4 ppb. The detailed analysis of the different systematic errors yields to a relative uncertainty of 6.7 ppb. The deduced value of 1/alpha is 137…

A promising method for the measurement of the local acceleration of gravity using Bloch oscillations of ultracold atoms in a vertical standing wave

An obvious determination of the acceleration of gravity g can be deduced from the measurement of the velocity of falling atoms using a pi-pi pulses sequence of stimulated Raman transitions. By using a vertical standing wave to hold atoms against gravity, we expect to improve the relative accuracy by increasing the upholding time in the gravity field and to minimize the systematic errors induced by inhomogeneous fields, owing to the very small spatial amplitude of the atomic center-of-mass wavepacket periodic motion. We also propose to use such an experimental setup nearby a Watt balance. By ex…

State of the art in the determination of the fine structure constant and the ratio $h/m_\mathrm{u}$

The fine structure constant $α$ and the ratio $h/m_{\mathrm{u}}$ between the Planck constant and the unified atomic mass are keystone constants for the determination of other fundamental physical constants, especially the ones involved in the framework of the future International System of units. This paper presents how these two constants, which can be deduced from one another, are measured. We will present in detail the measurement of $h/m_\mathrm{Rb}$ performed by atomic interferometry at the Laboratoire Kastler Brossel in Paris. This type of measurement also allows a test of the standard m…