Very Long Baseline Atom Interferometry (VLBAI) corresponds to ground-based atomic matter-wave interferometry on large scales in space and time, letting the atomic wave functions interfere after free evolution times of several seconds or wave packet separation at the scale of meters. As inertial sensors, e.g., accelerometers, these devices take advantage of the quadratic scaling of the leading order phase shift with the free evolution time to enhance their sensitivity, giving rise to compelling experiments. With shot noise-limited instabilities better than $10^{-9}$ m/s $^2$ at 1 s at the horizon, VLBAI may compete with state-of-the-art superconducting gravimeters, while providing absolute instead of relative measurements. When operated with several atomic states, isotopes, or species simultaneously, tests of the universality of free fall at a level of parts in $10^{13}$ and beyond are in reach. Finally, the large spatial extent of the interferometer allows one to probe the limits of coherence at macroscopic scales as well as the interplay of quantum mechanics and gravity. We report on the status of the VLBAI facility, its key features, and future prospects in fundamental science.Very Long Baseline Atom Interferometry (VLBAI) corresponds to ground-based atomic matter-wave interferometry on large scales in space and time, letting the atomic wave functions interfere after free evolution times of several seconds or wave packet separation at the scale of meters. As inertial sensors, e.g., accelerometers, these devices take advantage of the quadratic scaling of the leading order phase shift with the free evolution time to enhance their sensitivity, giving rise to compelling experiments. With shot noise-limited instabilities better than $10^{-9}$ m/s$^2$ at 1 s at the horizon, VLBAI may compete with state-of-the-art superconducting gravimeters, while providing absolute instead of relative measurements. When operated with several atomic states, isotopes, or species simultaneously, tests of the universality of free fall at a level of parts in $10^{13}$ and beyond are in reach. Finally, the large spatial extent of the interferometer allows one to probe the limits of coherence at macroscopic scales as well as the interplay of quantum mechanics and gravity. We report on the status of the VLBAI facility, its key features, and future prospects in fundamental science.

arXiv:1909.08524CPT and Lorentz SymmetryApr 7, 202017 citations

Techniques for Macroscopic Scale Atom Interferometry

Tim Kovachy, Peter Asenbaum, Chris Overstreet +2 more

Bulletin of the American Physical SocietyJun 8, 20170 citations

Precision Atom Interferometry with Light Pulses

Brenton C. Young, Mark A. Kasevich, Steven Chu

Elsevier eBooksJan 1, 199741 citations

Light storage on the time scale of a minute

Yaroslav O. Dudin, Lin Li, A. Kuzmich

Light storage on the minute scale is an important capability for future scalable quantum information networks spanning intercontinental distances. We employ an ultracold atomic gas confined in a one-dimensional optical lattice for long-term light storage. The differential ac Stark shift of the ground-level microwave transition used for storage is reduced to a sub-Hz level by the application of a magic-valued magnetic field. The $1/e$ lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.Light storage on the minute scale is an important capability for future scalable quantum information networks spanning intercontinental distances. We employ an ultracold atomic gas confined in a one-dimensional optical lattice for long-term light storage. The differential ac Stark shift of the ground-level microwave transition used for storage is reduced to a sub-Hz level by the application of a magic-valued magnetic field. The $1/e$ lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.

Physical Review AMar 6, 2013199 citations

Demonstration of Long coherence Times in Guided Atom Interferometers

Saijun Wu, Edward Su, Tao Hong +1 more

Bulletin of the American Physical SocietyMay 17, 20060 citations

Quantum Tunneling and Coherence Validated via Atom Interferometry — E8 Intelligence Research

Andrew Stewart Caldin

FINDING: Quantum tunneling and macroscopic quantum coherence are experimentally validated, with atom interferometry providing the key mathematical framework for wave-function evolution at scale. | MATH: Schrödinger equation $i\hbar \frac{\partial \psi}{\partial t} = \hat{H}\psi$ ; tunneling probability $T \approx e^{-2\kappa L}$ where $\kappa = \sqrt{2m(V_0-E)}/\hbar$ ; atom interferometry phase $\Delta\phi = \frac{m}{\hbar} \oint \mathbf{g}\cdot d\mathbf{r} \, dt$ (gravitational phase shift); decoherence rate $\Gamma \propto \Lambda^2$ (where $\Lambda$ is the action scale, $\Lambda = m v L / \hbar$ ). | CONNECTION: The exponential tunneling factor $e^{-2\kappa L}$ mirrors the golden-ratio-related decay constant $\phi^{-1} = 0.618$ when $\kappa L = 0.2405$ (i.e., $e^{-0.481} \approx 0.618$ ) — a specific resonance condition. More fundamentally, the action $S/\hbar$ quantization links to root-system lattice structures (e.g., $E_8$ in topol Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.comFINDING: Quantum tunneling and macroscopic quantum coherence are experimentally validated, with atom interferometry providing the key mathematical framework for wave-function evolution at scale. | MATH: Schrödinger equation $ i\hbar \frac{\partial \psi}{\partial t} = \hat{H}\psi $; tunneling probability $ T \approx e^{-2\kappa L} $ where $ \kappa = \sqrt{2m(V_0-E)}/\hbar $; atom interferometry phase $ \Delta\phi = \frac{m}{\hbar} \oint \mathbf{g}\cdot d\mathbf{r} \, dt $ (gravitational phase shift); decoherence rate $ \Gamma \propto \Lambda^2 $ (where $ \Lambda $ is the action scale, $ \Lambda = m v L / \hbar $). | CONNECTION: The exponential tunneling factor $ e^{-2\kappa L} $ mirrors the golden-ratio-related decay constant $ \phi^{-1} = 0.618 $ when $ \kappa L = 0.2405 $ (i.e., $ e^{-0.481} \approx 0.618 $) — a specific resonance condition. More fundamentally, the action $ S/\hbar $ quantization links to root-system lattice structures (e.g., $ E_8 $ in topol Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

Aug 26, 20260 citations

10^{-9}

m/s

^2

at 1 s at the horizon, VLBAI may compete with state-of-the-art superconducting gravimeters, while providing absolute instead of relative measurements. When operated with several atomic states, isotopes, or species simultaneously, tests of the universality of free fall at a level of parts in

10^{13}

and beyond are in reach. Finally, the large spatial extent of the interferometer allows one to probe the limits of coherence at macroscopic scales as well as the interplay of quantum mechanics and gravity. We report on the status of the VLBAI facility, its key features, and future prospects in fundamental science.

1/e

lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.

i\hbar \frac{\partial \psi}{\partial t} = \hat{H}\psi

; tunneling probability

T \approx e^{-2\kappa L}

where

\kappa = \sqrt{2m(V_0-E)}/\hbar

; atom interferometry phase

\Delta\phi = \frac{m}{\hbar} \oint \mathbf{g}\cdot d\mathbf{r} \, dt

(gravitational phase shift); decoherence rate

\Gamma \propto \Lambda^2

(where

\Lambda

is the action scale,

\Lambda = m v L / \hbar

). | CONNECTION: The exponential tunneling factor

e^{-2\kappa L}

mirrors the golden-ratio-related decay constant

\phi^{-1} = 0.618

when

\kappa L = 0.2405

(i.e.,

e^{-0.481} \approx 0.618

) — a specific resonance condition. More fundamentally, the action

S/\hbar

quantization links to root-system lattice structures (e.g.,

E_8

in topol Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com