Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session E05: Atom Interferometry Methods and Developments |
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Chair: Justin Brown, University of Southern California Room: 205 |
Tuesday, June 6, 2023 2:00PM - 2:12PM |
E05.00001: Cold atom experiments aboard the International Space Station Patrick B Boegel, Gabriel Müller, Matthias Meister, Naceur Gaaloul, Nicholas P Bigelow Bose-Einstein condensates (BECs) are expected to be systems for quantum sensing applications like navigation, relativistic geodesy and tests of the universality of free fall. The sensitivity of most such atom interferometers increases quadratically with the interrogation time, which makes it beneficial to extend the free fall time. To accomplish this goal NASA has launched the Cold Atom Lab (CAL) [1] to the International Space Station. |
Tuesday, June 6, 2023 2:12PM - 2:24PM |
E05.00002: Development of a miniature atomic accelerometer for spacecraft drag-free force measurement Mehdi Langlois, Saesun Kim, Yun-Jhih Chen, Sheng-Wey Chiow, Nan Yu Atom interferometers demonstrate state-of-the-art performance in inertial sensors. This technology can be used as an onboard three-axis absolute accelerometer in spacecraft for planetary science measurements. Such an instrument would allow us to measure non-gravitational forces on spacecraft such as atmospheric drag and solar radiation in order to obtain drag-free measurements, opening new possibilities for exploring diverse planetary environments. |
Tuesday, June 6, 2023 2:24PM - 2:36PM |
E05.00003: Single-photon transitions for atom-interferometric detectors Enno Giese, Alexander Bott, Fabio Di Pumpo Atom interferometers have evolved into a competitive tool for inertial sensing and tests of fundamental physics. Most proposals for the detection of dark matter or gravitational waves with atom interferometers rely on differential measurements of two spatially separated interferometers, operated with the same diffraction beams. To suppress differential laser phase noise on the timescale of light propagation that inevitably arises in Raman or Bragg diffraction, single-photon transitions are the method of choice for such sensors. In this contribution, we present a theoretical discussion of such single-photon transitions and distinguish between different processes: direct transitions and transitions induced by static magnetic fields. We explicitly derive the latter by consistently eliminating an auxiliary state and show the effect of hypothetical dark-matter fields on the process itself as well as gravity. Moreover, we study the influence of the atomic motion on the resonance condition during diffraction and find an effective time evolution of the system. |
Tuesday, June 6, 2023 2:36PM - 2:48PM |
E05.00004: Laser Wavefront Metrology using Point Source Atom Interferometry with 3-D imaging reconstruction Yiping Wang, Sean Gasiorowski, Kenneth DeRose, Murtaza Safdari, Kefeng Jiang, Sanha Cheong, Jonah Glick, Tejas Deshpande, Sharika Saraf, Michael Kagan, Ariel Schwartzman, Timothy Kovachy In atom interferometry, position dependent wavefront aberrations from the atom optics laser beam can induce phase shifts in the atom cloud and result in major systematic phase shift errors and dephasing. |
Tuesday, June 6, 2023 2:48PM - 3:00PM |
E05.00005: Nanofiber Tesbed for Atom Interferometry On-Chip Adrian S Orozco, Jongmin Lee Guided atom interferometers are promising candidates for reaching SWAP requirements to realize fieldable atom interferometer sensors. An all-optical atom guide on membrane integrated photonics is a promising candidate for miniaturizing quantum accelerometers and gyroscopes with design flexibility and scalability. To study atomic coherence in an evanescent-field optical dipole trap (EF-ODT) and validate the feasibility of all-optical atom trap on chip, we performed Rabi and Ramsey measurements on the nanofiber testbed using a magic-wavelength trap for Cs atoms and tested an EF-ODT with new trap wavelengths chosen for alumina membrane integrated photonics. In addition, we will show our progress on membrane integrated photonics, such as sub-Doppler cooled membrane MOTs with efficient atom loading and high optical power handling capability in vacuum. |
Tuesday, June 6, 2023 3:00PM - 3:12PM |
E05.00006: Quantum control of a Tractor Atom Interferometer Sebastian C Carrasco, Michael H Goerz, Alisher Duspayev, Bineet K Dash, Georg A Raithel, Vladimir S Malinovsky In this work, we discuss Tractor Atom Interferometry (TAI), in which 3D traps are employed to transport ultracold atoms on predetermined trajectories before recombining them for sensing purposes. Tight, uninterrupted confinement facilitates guaranteed recombination, avoids dispersion, and allows long holding times while keeping the device compact without sacrificing TAI sensitivity. The simplest way to program the TAI is to use slow trajectories that retain adiabaticity. However, to fully exploit the potential of TAI, it is crucial to speed up trajectories while maximizing sensitivity and robustness, i.e., suppressing detrimental nonadiabatic excitations and maximizing the available time for accumulating a differential phase. To do so, we employ novel optimal quantum control techniques to obtain optimal trajectories. We show that the splitting and recombination can be two orders of magnitude shorter by relaxing adiabaticity conditions for the case where the device functions as an accelerometer. |
Tuesday, June 6, 2023 3:12PM - 3:24PM |
E05.00007: Quantum metrology with a trapped atom interferometer interrogated for one minute Cristian D Panda, Matthew Tao, Miguel Ceja, Andrew Reynoso, Holger Müller Precise control of quantum states allows atom interferometers to explore fundamental physics and perform inertial sensing. For atomic fountain interferometers, the measurement time is limited by the available free-fall time in meters-long apparatus to a few seconds. We instead realize atom interferometry with a coherent spatial superposition state held by an optical lattice for longer than 1 minute, more than 25 times longer than any atomic fountain interferometer. This performance was made possible by recent advances in the understanding and control of coherence-limiting mechanisms. An order of magnitude increase in sensitivity enables near-term applications such as gravimetry measurements, searches for fifth forces, or fundamental probes into the non-classical nature of gravity. |
Tuesday, June 6, 2023 3:24PM - 3:36PM |
E05.00008: Investigating the feasibility of a trapped atom interferometer with movable traps Gayathrini Premawardhana, Jonathan Kunjummen, Jacob M Taylor Atom interferometers can be used to obtain information about accelerations and fields, whether this may be in the investigation of fundamental aspects of physics, such as measuring fundamental constants or testing gravity, or as part of a measurement device, such as an accelerometer [1,2,3]. Achieving adequate coherence times remains a priority, and this can be realized by holding the atoms in a trap as an alternative to increasing their free fall time [1]. We are developing a concept for such a trapped atom interferometer, with tweezer traps movable in one or more dimensions, as such movement is expected to award us with more spatial and temporal information than with a stationary trap. In order to quantitatively investigate certain aspects related to the feasibility of experimentally realizing such a setup, we aim to understand some effects of noise from a tweezer’s laser intensity fluctuations. Modeling a tweezer trap as a simple harmonic oscillator, we aim to understand how the coherence can be affected in the presence of such noise, while specifically looking at the effects of any harmonic oscillator transitions that could arise. |
Tuesday, June 6, 2023 3:36PM - 3:48PM |
E05.00009: Realization of a guided matter wave gradiometer Changhyun Ryu, Kevin C Henderson A gradiometer has been developed to measure of the gradient of various fields and forces through differential measurements. Atom interferometers in free space have been used to realize one of the most sensitive gradiometers with separate clouds of atoms by implementing parallel atom interferometers. However, the required significant interrogation time results in a large free fall distance, making it difficult to develop a portable sensor and increase the sensitivity for the most critical applications. To realize a gradiometer in a compact setup without lowering sensitivity, we developed a guided matter wave gradiometer. Atoms were trapped radially within a waveguide, realized with a single laser beam, to increase the interrogation time without the large free fall distance. An acceleration of atoms along the axial direction of the waveguide beam was measured with two clouds of atoms to realize a gradiometer. A coherent interrogation time of 150 ms was demonstrated. The acceleration difference between two clouds of atoms due to the magnetic field gradient was measured to demonstrate the gradiometer operation. In this talk, the current progress of this project will be presented. |
Tuesday, June 6, 2023 3:48PM - 4:00PM |
E05.00010: Cold and Continuous Atom Interferometer with Advanced Sensing Techniques Jonathan M Kwolek, Adam T Black We present new measurements of a continuous atomic interferometer designed for inertial sensing. The interferometer is derived from an atom source which emits a continuous beam of sub-Doppler cooled atoms while simultaneously mitigating near-resonant scattered light. Enabled by the unique properties of the atom source, the derived interferometer demonstrates continuous measurement exhibiting high contrast and low noise. We describe and characterize the concept of rapid switching of intertial sensitivity, much faster than the characteristic time-scale of a typical matter-wave interferometer, including a noise analysis and comparison with traditional methods Our work here inspires future cold-atom architectures which can measure with both high sensitivity and high bandwidth. |
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