Splitting the Raman beamsplitter

Abstract

We present an atom interferometry technique in which the beamsplitter is split into two separate operations. A microwave pulse first creates a spin-state superposition, before optical adiabatic passage spatially separates the arms of that superposition. Despite using a thermal atom sample in a small ($600\mu$m) interferometry beam, this procedure delivers an efficiency of $99\%$ per $\hslash k$ of momentum separation. Utilizing this efficiency, we first demonstrate interferometry with up to $16\hslash k$ momentum splitting and free-fall limited interrogation times. We then realize a single-source gradiometer, in which two interferometers measuring a relative phase originate from the same atomic wavefunction. Finally, we demonstrate a resonant interferometer with over 100 adiabatic passages, and thus over $400\hslash k$ total momentum transferred.

6 pages, 4 figures

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• ELGAR -- a European Laboratory for Gravitation and Atom-interferometric Research
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• Twin-lattice atom interferometry
• Using an atom interferometer to infer gravitational entanglement generation
• Momentum Entanglement for Atom Interferometry
• Atom Interferometry with Floquet Atom Optics
• Geometric control of collective spontaneous emission
• Multi-Dimensional Atom Optics and Interferometry
• Quantum test of the Universality of Free Fall using rubidium and potassium
• Atom-interferometric test of the universality of gravitational redshift and free fall
• Coherence limits in lattice atom interferometry at the one-minute scale
• Scalable, symmetric atom interferometer for infrasound gravitational wave detection
• Optimal Floquet Engineering for Large Scale Atom Interferometers
• Proof-of-principle demonstration of vertical gravity gradient measurement using a single proof mass double-loop atom interferometer
• Bi-selective pulses for large-area atom interferometry
• Suppressed spontaneous emission for coherent momentum transfer
• Atom interferometry with coherent enhancement of Bragg pulse sequences
• Robust Quantum Control via Multipath Interference for Thousandfold Phase Amplification in a Resonant Atom Interferometer
• Technologies for the ELGAR large scale atom interferometer array
• Atomic spin-wave control and spin-dependent kicks with shaped subnanosecond pulses
• Enhancing fiber atom interferometer by in-fiber laser cooling
• Fast control of atom-light interaction in a narrow linewidth cavity
• Atom interferometry using ${\sigma }^{+}$-${\sigma }^{-}$ Raman transitions between $F=1,m_F=\mp 1$ and $F=2,m_F=\pm 1$
• Spinor matterwave control with nanosecond spin-dependent kicks
• Analog Stabilization of an Electro-Optic I/Q Modulator with an Auxiliary Modulation Tone
• Controlling the dynamical scale factor in a trapped atom Sagnac Interferometer