A5036062511- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Measurement and Uncertainty Evaluation
- Advanced Frequency and Time Standards
- Radioactive Decay and Measurement Techniques
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- History and advancements in chemistry
- Acoustic Wave Resonator Technologies
- Mechanical and Optical Resonators
- Geophysics and Sensor Technology
- Advanced Fiber Laser Technologies
- Advanced Materials Characterization Techniques
- Quantum Mechanics and Applications
- Quantum Information and Cryptography
University of California, Berkeley
2016-2020
Measurements of the fine-structure constant α require methods from across subfields and are thus powerful tests consistency theory experiment in physics. Using recoil frequency cesium-133 atoms a matter-wave interferometer, we recorded most accurate measurement to date: = 1/137.035999046(27) at 2.0 × 10-10 accuracy. multiphoton interactions (Bragg diffraction Bloch oscillations), demonstrate largest phase (12 million radians) any Ramsey-Bordé interferometer control systematic effects level...
The authors investigate Bloch oscillations of ultracold atoms in two superposed optical lattices that are accelerated away from one another a joint theoretical and experimental study. also demonstrate this setup can be used for coherently controlling superpositions momentum states atom interferometry.
Abstract Using an atom interferometer to measure the quotient of reduced Planck's constant and mass a cesium‐133 , most accurate measurement fine structure is recorded, at accuracy 0.20 parts per billion (ppb). multiphoton interactions (Bragg diffraction Bloch oscillations), largest phase (12 million radians) any Ramsey–Bordé controlled systematic effects level 0.12 ppb are demonstrated. Comparing Penning trap measurements with Standard Model prediction electron gyromagnetic anomaly based on...
We present a hybrid laser frequency stabilization method combining modulation transfer spectroscopy (MTS) and (FMS) for the cesium D2 transition. In typical pump-probe setup, error signal is combination of DC-coupled MTS AC-coupled FMS signal. This combines long-term stability former with high signal-to-noise ratio latter. addition, we enhance intensity stabilization. By measuring difference between two independent spectroscopies, investigate short-and stability. find 7.8 kHz characterized...
Bragg diffraction has been used in atom interferometers because it allows signal enhancement through multiphoton momentum transfer and suppression of systematics by not changing the internal state atoms. Its multi-port nature, however, can lead to parasitic interferometers, for intensity-dependent phase shifts primary distorts ellipses extraction. We study suppress these unwanted effects. Specifically, extraction ellipse fitting resulting systematic are calculated Monte Carlo simulations....
Correlating the signals from simultaneous atom interferometers has enabled some of most precise determinations fundamental constants. Here, we show that multiple with strategically chosen initial conditions ("offset conjugate interferometers" or OSCIs) can provide multi-channel readouts amplify suppress specific effects. This allows us to measure photon recoil, and thus fine structure constant, while being insensitive gravity gradients, general acceleration unwanted diffraction phases -...