PM: Cavity-based Atomic Gravimeter

PM：腔体原子重力计

• 批准号: 2208029
• 负责人: Holger Mueller
• 金额: $ 118.01万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2027-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2208029&HistoricalAwards=false
• 关键词: PM; Cavity; based; Atomic; Gravimeter

Applying the principles of quantum mechanics holds promise to make extremely precise measurements, beyond the capabilities of more traditional methods. However, unwanted interactions of the quantum measurement device with the environment negate the advantages of quantum measurement in a process known as decoherence. One particularly interesting class of quantum measurement devices are atom interferometers. To avoid unwanted decoherence, they are usually performed with particles in free fall, but the available height limits these setups to time scales below 3 seconds. This project builds on an alternative approach, suspending atoms in a laser beam that forms a periodic, attractive potential for the atoms. The aim is to realize coherences for as long as several minutes, and thereby realize the most sensitive atomic device to measure gravity. This will then be applied to fundamental research in gravitational physics. In addition, the research will have broader impacts in contributing to UC Berkeley's efforts to educate a "quantum workforce" by offering hands-on training to undergraduate and graduate students.The proposal builds on the previous demonstration of 20-second coherences in a lattice-hold atom interferometer using an optical lattice formed by a resonant laser beam inside an optical resonator. Based on the observation that lowering the atom temperatures strongly increases the coherence, longer coherence times will be achieved by upgrading the experiment with a Bose-Einstein condensed (BEC) atomic sample. The next step will be to test whether the strongly reduced atomic temperature will lead to minutes of coherence time and a sensitivity of up to 2 nano-g in one second of integration time (where g is the earth's acceleration of free fall), realizing the world’s most sensitive atomic gravimeter. If this is successful, it will form the basis for the proposed test of the gravitational Aharonov-Bohm effect, in which a miniaturized test mass will form a "w"-shaped gravitational potential. Atomic wave packets will be brought to two points at which the potential does not apply forces on the atoms, and the Aharonov-Bohm induced phase shift will be recorded.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

应用量子力学原则有望进行极为精确的测量，超出了更传统的方法的能力。但是，量子测量设备与环境的不良相互作用在称为逆转的过程中否定了量子测量的优势。一类特别有趣的量子测量设备是原子干扰。为了避免不必要的破坏，通常会在自由秋季中用颗粒执行，但是可用的高度将这些设置限制为3秒以下的时间尺度。该项目以另一种方法为基础，将原子悬浮在激光束中，该原子构成了原子的周期性，有吸引力的潜力。目的是要长达几分钟，从而实现连贯性，从而实现最敏感的原子装置来测量重力。然后，这将应用于引力物理学的基本研究。 In addition, the research will have broader impacts in contributing to UC Berkeley's efforts to educate a "quantum workforce" by offering hands-on training to undergraduate and graduate students.The proposal builds on the previous demonstration of 20-second coherences in a lattice-hold atom interferometer using an optical lattice formed by a resonant laser beam inside an optical resonator.基于观察到降低原子温度会强烈提高相干性的观察结果，通过用Bose-Einstein凝结（BEC）原子样品升级实验来实现更长的相干时间。下一步将是测试强烈降低的原子温度是否会导致连贯时间的数分钟，并且在整合时间的一秒钟内（G是地球的自由下落加速），意识到世界上最敏感的原子重量表。如果这是成功的，它将构成对引力Aharonov-Bohm效应的拟议测试的基础，其中微型测试质量将形成“ W”形状的重力潜力。原子波包将被带到两个点，在这些点上，电位不在原子上施加力，并且将记录Aharonov-Bohm诱导的相移。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的审查标准来评估NSF的法定任务。

项目成果

Atomic gravimeter robust to environmental effects

• DOI: 10.1063/5.0163101
• 发表时间: 2023-08-07
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Panda，Cristian D. D.;Tao，Matt;Muller，Holger
• 通讯作者: Muller，Holger