Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session D05: Quantum Metrology and Sensing ILive

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Chair: Sofia Economou, Virginia Tech Room: D139140 
Tuesday, June 2, 2020 2:00PM  2:12PM Live 
D05.00001: Experimental realisation of a BEC waveguide Sagnac atom interferometer Katarzyna Krzyzanowska, Jorge Ferreras, Kevin Henderson, Changhyun Ryu, Malcolm Boshier Sagnac atom interferometers in which atoms move in freefall can function as highperformance rotation sensors. However, the comparatively large physical size of such devices is a problem in some important applications. This issue motivates the development of waveguide Sagnac atom interferometers because they offer the prospect of a large enclosed total area in a small physics package. We are developing a Sagnac atom interferometer utilizing Bosecondensed rubidium atoms confined to a waveguide formed from a collimated laser beam. Deltakick cooling is used to prepare lowdensity atomic wavepackets with a temperature of 300pK. The low temperature reduces the impact of interatomic interactions, as well as the expansion of the wavepacket during the interferometer cycle. The BEC is split, reflected and recombined with a series of Bragg pulses while the waveguide moves transversely so that the wavepacket trajectories enclose an area. We have achieved an enclosed area of 0.8 mm\textsuperscript{2} with a coherence time of 80ms. In this talk, we will describe recent progress on the experiment and discuss important systematic errors in this type of atom interferometer. [Preview Abstract] 
Tuesday, June 2, 2020 2:12PM  2:24PM Live 
D05.00002: Scaling twodimensional arrays of strontium atoms in optical tweezers for manybody physics and precision metrology William Eckner, Aaron Young, William Milner, Matthew Norcia, Nathan Schine, Dhruv Kedar, Jun Ye, Adam Kaufman Ultracold atoms in optical lattices and tweezer arrays have independently provided flexible environments for studies of manybody quantum physics and opticalfrequency metrology. Here we present on a new platform for creating twodimensional optical potentials loaded with hundreds of strontium atoms, each in its threedimensional groundstate. The building blocks for this platform are tweezers and lattices, between which atoms can be adiabatically transferred, and where each potential can independently address the diverse challenges posed by each step in an experimental sequence. We then leverage this new technology toward the development of a precise optical atomic clock with longlived atomatom coherence and high relative frequency stability. By `Rydbergdressing' the metastable clock state, we plan to introduce switchable, longrange interactions in a tunable twodimensional array of 50200 atoms. This would allow for studies of the metrological usefulness of highlyentangled `squeezedstates,' as well as investigations into a broad class of interacting manybody spin systems, such as the transversefield Ising model. [Preview Abstract] 
Tuesday, June 2, 2020 2:24PM  2:36PM Live 
D05.00003: Absolute vector magnetometry with atomic vapor by referencing to microwave polarization Christopher Kiehl, Tobias Thiele, Daniel Wagner, TingWei Hsu, Mark O. Brown, Cindy A. Regal, Svenja Knappe Many of the applications of sensitive magnetometers, ranging from precision measurements, darkmatter searches, and timekeeping to biological imaging, navigation, and exploration, can benefit from full vector detection. Several options have been explored to extend atomic magnetometers based on hot vapor cells, which are the most sensitive uncooled sensors, to the vector domain. While lengthy and mechanically complicated calibration algorithms exist, directional accuracy with these sensors remains elusive due to the lack of a stable and precise reference to calibrate drifts in relative axes orientation that are often defined by bias coil or beam propagation directions. In this talk, I will describe an approach to sensitive and accurate vector magnetometry in a hot vapor cell that exploits the 3D structure of a microwave field as a stable reference. Using an algorithmic construct, we first map the full polarization ellipse of a microwave field from the Rabi oscillations observed between hyperfine magnetic sublevels driven with different microwave polarization components. Importantly, our construct reveals typically unknown systematics such as coil misalignments, background fields, Stark shifts, and pressure shifts to within our measurement sensitivities. With the polarization ellipse acting as a calibrated reference, we are able to use solely Rabi measurements to absolutely determine both the direction and magnitude of an unknown magnetic field. [Preview Abstract] 
Tuesday, June 2, 2020 2:36PM  2:48PM Live 
D05.00004: Phase estimation of coherent states through photon counting and optimized feedback Matthew DiMario, Elohim Becerra Optical interferometric measurements are an essential tool in many areas of physics where a single mode of light can be used to learn about the properties of a physical system. Coherent states of light are favorable states in such measurements, as information can be mapped into the phase of such states, while being robust under losses. The difficulty however, lies in extracting this information with minimal uncertainty, especially in a singleshot measurement. The CramerRao lower bound (CRLB) is the fundamental limit for this uncertainty, given a physical probe state. A physically realizable singleshot measurement strategy that reaches this limit of precision, or even outperforms the ideal heterodyne measurement given by twice the CRLB, has yet to be experimentally demonstrated. We propose and implement a singleshot measurement for phase estimation of coherent states based on coherent displacement operations, single photon counting, and fast feedback. Our demonstration surpasses the ideal heterodyne measurement limit without correcting for detection efficiency in our implementation. This performance is achieved by realtime optimization of the displacement operation conditioned on the detection history as the measurement progresses. [Preview Abstract] 
Tuesday, June 2, 2020 2:48PM  3:00PM Live 
D05.00005: Quantifying Nonclassicality via the Precision in Quantum Metrology Wenchao Ge, Kurt Jacobs, Saeed Asiri, Michael FossFeig, Suhail Zubairy The nonclassical properties of quantum states are of tremendous interest due to their potential applications in future technologies. It has recently been realized that the concept of a “resource theory” is a powerful approach to quantifying and understanding nonclassicality. An important goal in this endeavor is to find resource theoretic measures of nonclassicality that are “operational”, meaning that they also quantify the ability of quantum states to provide enhanced performance for specific tasks, such as precision sensing. In this talk, I will present an operational resource theoretic measure that makes a strong connection between nonclassicality and metrological power. I will also show that a balanced MachZehnder Interferometer provides a way to experimentally extract this measure. [Preview Abstract] 
Tuesday, June 2, 2020 3:00PM  3:12PM Live 
D05.00006: Beyond standard Heisenberg limit through manybody correlated tunneling Lushuai Cao, Xiaochun Duan, Xing Deng, Shoulong Chen It is well known that the uncertainty of classical measurement scales as 1/$\backslash $sqrt\textbraceleft N\textbraceright , where N refers to the total number of the copies of the probes. And in quantum measurement, the uncertainty can achieve an improved scaling of 1/N, using entangled or squeezed states as the probe. Recently, it has been experimentally proved that the scaling of the uncertainty could even reach 1/N\textasciicircum \textbraceleft k\textbraceright , by engineering a kbody interaction. In this talk, we propose that, instead of the kbody interaction, the kbody correlated tunneling could also give rise to a new scaling of 1/J\textasciicircum k, where J is the strength of the effective kbody tunneling. Moreover, we will introduce detailed measurement schemes based on the realizable kbody correlated tunnelings of ultracold atoms. These schemes are also analyzed by the calculation of the quantum and classical Fisher information, which confirms the new scaling in these setups. [Preview Abstract] 
Tuesday, June 2, 2020 3:12PM  3:24PM Live 
D05.00007: Quantum Measurements with an Electron Matter Wave Interferometer Benjamin McMorran, Alice Greenberg, Cameron Johnson, Amy Turner New developments in electron optics enable quantuminspired measurements with electrons. For example, nanoscale diffraction holograms can produce free electron wavefunctions with nontrivial phase profiles that provide a new way to probe the chirality and spatial coherence of nanoscale plasmonics. We report results demonstrating symmetrybreaking inelastic interactions between electron vortex beams and chiral nanoparticle clusters. Nanoscale material phase gratings can also serve as optimized beamsplitters for electrons. We used this in an electron MachZehnder interferometer with large path separation  up to 200 microns  and have demonstrated its use to measure and image electric and magnetic fields at the nanoscale. More recently, we demonstrated interactionfree measurements with this matter wave interferometer. These early demonstrations may also serve as key steps towards novel forms of electron microscopy and spectroscopy that could potentially be used to coherently probe quantum systems  perhaps even manipulate them  as well as image sensitive phase objects like biological molecules with atomic resolution. [Preview Abstract] 
Tuesday, June 2, 2020 3:24PM  3:36PM On Demand 
D05.00008: SubFourier Frequency Resolution with a Quantum Sensor Sara Mouradian, Eli Megidish, Neil Glikin, KaiIsaac Ellers, Harmut Haeffner Resolution of the frequency components of a timedependent signal is conventionally limited by the total measurement time. This limits spectroscopy of signals with short coherence times. Here, we demonstrate subFourier resolution of the frequency components of an incoherent signal with at most two frequencies using a quantum sensor. In particular, we pick a measurement time at which the quantum sensor will be in an eigenstate if there is only one frequency and perform a measurement in that basis. Thus, we take advantage of the fact that quantum projection noise approaches zero as the measured state approaches a basis state. Using this protocol, we are able to measure a frequency separation of 200Hz with a sensitivity of $11~Hz/\sqrt{\rm{Hz}}$ at a measurement time of only 2ms. [Preview Abstract] 
Tuesday, June 2, 2020 3:36PM  3:48PM Not Participating 
D05.00009: Optical properties of atoms in solid parahydrogen David Lancaster, Ugne Dargyte, Sunil Upadhyay, Jonathan Weinstein The favorable spin coherence properties of alkali atoms trapped in solid parahydrogen make them a promising experimental resource. %for use as singleatom quantum sensors. The optical properties of these atoms are key to using them as sensors and in other applications. % To date, our work has used absorption spectroscopy to probe largenumber samples. % To use single atoms as quantum sensors will require fluorescence detection methods. %is understanding their optical properties in the solid. This talk will describe our work to measure essential optical properties of atoms in parahydrogen: absorption, fluorescence, and optical cycling. Prospects for detecting single atoms in parahydrogen will be discussed. [Preview Abstract] 
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