Atom radio-frequency interferometry

Abstract

We realize and model a Rydberg-state atom interferometer for measurement of phase and intensity of radio-frequency (RF) electromagnetic waves. A phase reference is supplied to the atoms via a modulated laser beam, enabling atomic measurement of the RF wave's phase without an external RF reference wave. The RF and optical fields give rise to closed interferometric loops within the atoms' internal Hilbert space. In our experiment, we construct interferometric loops in the state space $\{6P_{3/2},90S_{1/2},91S_{1/2},90P_{3/2}\}$ of cesium and employ them to measure phase and intensity of a 5 GHz RF wave in a room-temperature vapor cell. Electromagnetically induced transparency on the $6S_{1/2}$ to $6P_{3/2}$ transition serves as an all-optical interferometer probe. The RF phase is measured over a range of $\pi$, and a sensitivity of 2 mrad is achieved. RF phase and amplitude measurements at sub-millimeter optical spatial resolution are demonstrated.

5 pages, 4 figures

References in corpus (4)

• Atom Interferometers
• Sub-Wavelength Imaging and Field Mapping via EIT and Autler-Townes Splitting In Rydberg Atoms
• Assessment of Rydberg Atoms for Wideband Electric Field Sensing
• Rydberg atoms for radio-frequency communications and sensing: atomic receivers for pulsed RF field and phase detection

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• Hyperfine Structure of $n{P}_{1/2}$ Rydberg States in ${}^{85}$Rb
• Non-Linearities In Atomic Quantum Receivers: Harmonic And Intermodulation Distortion
• Superheterodyne Rydberg S-band receiver with a multi-tone local oscillator based on an atomic transition loop