A5055005428- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Geophysics and Sensor Technology
- Quantum Mechanics and Applications
- Advanced Materials Characterization Techniques
- Quantum Information and Cryptography
- Force Microscopy Techniques and Applications
- Experimental and Theoretical Physics Studies
- Quantum, superfluid, helium dynamics
- Diamond and Carbon-based Materials Research
- Advanced Thermodynamics and Statistical Mechanics
- Analytical Chemistry and Sensors
- Radioactive Decay and Measurement Techniques
Leibniz University Hannover
2016-2024
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
We demonstrate a quantum gravimeter by combining the advantages of an atom chip for generation, delta-kick collimation, and coherent manipulation freely falling Bose-Einstein condensates (BECs) with innovative launch mechanism based on Bloch oscillations double Bragg diffraction. Our high-contrast BEC interferometer realizes tens milliseconds free fall in volume as little one centimeter cube paves way measurements sub-μGal accuracies miniaturized, robust devices.Received 13 May...
Inertial sensors based on cold atoms have great potential for navigation, geodesy, or fundamental physics. Similar to the Sagnac effect, their sensitivity increases with space-time area enclosed by interferometer. Here, we introduce twin-lattice atom interferometry exploiting Bose-Einstein condensates. Our method provides symmetric momentum transfer and large areas in palm-sized sensor heads a performance similar present meter-scale devices.
We propose a terrestrial detector for gravitational waves with frequencies between 0.3 and 5 Hz based on atom interferometry. As key elements, we discuss two symmetric matter-wave interferometers, the first one single loop second featuring folded triple-loop geometry. The latter eliminates need atomic ensembles at femtokelvin energies imposed by Sagnac effect in other interferometric detectors. geometry also combines several advantages of current vertical horizontal matter wave antennas...
Compared to light interferometers, the flux in cold-atom interferometers is low and associated shot noise large. Sensitivities beyond these limitations require preparation of entangled atoms different momentum modes. Here, we demonstrate a source that compatible with state-of-the-art interferometers. Entanglement transferred from spin degree freedom Bose-Einstein condensate well-separated modes, witnessed by squeezing parameter -3.1(8) dB. Entanglement-enhanced atom promise unprecedented...
Recent developments in quantum technology have resulted a new generation of sensors for measuring inertial quantities, such as acceleration and rotation. These can exhibit unprecedented sensitivity accuracy when operated space, where the free-fall interrogation time be extended at will environment noise is minimal. European laboratories played leading role this field by developing concepts tools to operate these relevant environment, parabolic flights, towers, or sounding rockets. With...
Abstract The sensitivity of light and matter-wave interferometers to rotations is based on the Sagnac effect increases with area enclosed by interferometer. In case light, latter can be enlarged forming multiple fibre loops, whereas equivalent for remains an experimental challenge. We present a concept multi-loop atom interferometer scalable formed pulses. Our method will offer sensitivities as high $$2\times 10^{-11}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow>...
Abstract Matter-wave interferometry and spectroscopy of optomechanical resonators offer complementary advantages. Interferometry with cold atoms is employed for accurate long-term stable measurements, yet it challenged by its dynamic range cyclic acquisition. Spectroscopy features continuous signals large range, however generally subject to drifts. In this work, we combine the advantages both devices. Measuring motion a mirror matter waves interferometrically respect joint reference allows...
Abstract Out of a single Bose-Einstein condensate (BEC), we create two simultaneous interferometers, as employed for the differentiation between rotations and accelerations. Our method exploits precise motion control BECs combined with momentum transfer by double Bragg diffraction interferometry. In this way, scheme avoids complexity BEC sources can be readily extended to six-axis quantum inertial measurement unit. Graphical abstract
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
We provide an introduction into the field of atom optics and review our work on interferometry with cold atoms, in particular Bose-Einstein condensates. Here we emphasize applications sources this kind. discuss tests equivalence principle, a quantum tiltmeter, gravimeter.
Abstract We investigate time-domain optics for atomic quantum matter. Within a matter-wave analog of the thin-lens formalism, we study optical lenses different shapes and refractive powers to precisely control dispersion Bose–Einstein condensates. Anharmonicities lensing potential are incorporated in formalism with decomposition center-of-mass motion expansion atoms, allowing probe micrometer resolution. By arranging two time formed by potentials an dipole trap atom-chip trap, realize...
We provide an introduction into the field of atom optics and review our work on interferometry with cold atoms, in particular Bose-Einstein condensates. Here we emphasize applications sources this kind. discuss tests equivalence principle, a quantum tiltmeter, gravimeter.
Atom interferometers are sensitive to a wide range of forces by encoding their signals in interference patterns matter waves. To estimate the magnitude these forces, underlying phase shifts they imprint on atoms must be extracted. Up until now, extraction algorithms typically rely fixed model patterns' spatial structure, which if inaccurate can lead systematic errors caused by, for example, wavefront aberrations used lasers. In this paper we employ an algorithm based Principal Component...
We present the development of an atom chip system along with associated peripherals for a six-axis quantum inertial navigation sensor based on interferometry. Based mechanical measurement concepts, these sensors are expected to have high sensitivity and superior long-term stability compared conventional sensors. Furthermore, they enable offset-free absolute measurement. However, low rate proves be disadvantage. Compared classical sensors, thus exhibit complementary features, so that...