Dr. Adam T. Black Profile

Dr. Adam T. Black

Research Physicist at US Naval Research Lab

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Publications (5)

Proceedings Article | 13 March 2024 Presentation + Paper

Time-domain control of a spatial-domain atomic beam interferometer

Adam Black, Hans Haucke, Sunil Upadhyay, Ryan O'Donnell, Jonathan Kwolek

Proceedings Volume 12912, 129120K (2024) https://doi.org/10.1117/12.3011736

KEYWORDS: Interferometers, Raman spectroscopy, Vibration, Error analysis, Quantum interferometry, Spectral density, Aliasing, Sensors

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Proceedings Article | 8 March 2023 Presentation + Paper

Velocity‐modulated atom interferometry with enhanced dynamic range

Adam Black, Jonathan Kwolek

Proceedings Volume 12447, 124470W (2023) https://doi.org/10.1117/12.2657192

KEYWORDS: Interferometers, Phase shifts, Quantum interferometry, Modulation, Interferometry, Raman spectroscopy, Phase shift keying, Phase measurement, Phase interferometry

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Proceedings Article | 3 March 2022 Presentation + Paper

High-bandwidth, sub-Doppler atomic beam interferometry

Adam Black, Jonathan Kwolek

Proceedings Volume 12016, 1201603 (2022) https://doi.org/10.1117/12.2616923

KEYWORDS: Inertial navigation systems, Optical cooling, Raman spectroscopy, Interferometers, Interferometry, Phase measurement, Luminescence, Modulation, Doppler effect, Mirrors, Photodiodes

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Proceedings Article | 25 February 2020 Paper

Decoherence and dynamics in continuous 3D-cooled atom interferometry

Adam Black, Jonathan Kwolek, Charles Fancher, Mark Bashkansky

Proceedings Volume 11296, 1129607 (2020) https://doi.org/10.1117/12.2552540

KEYWORDS: Interferometers, Raman spectroscopy, Luminescence, Doppler effect, 3D metrology, Sensors, Clocks, Interferometry, Light scattering

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Proceedings Article | 13 May 2019 Paper

Experimental demonstration of a passive temperature stabilized quantum memory for storage of polarization qubits in a cold atomic ensemble

Thomas Akin, John Reintjes, Michal Piotrowicz, Adam Black, Alex Kuzmich, Mark Bashkansky

Proceedings Volume 10984, 1098405 (2019) https://doi.org/10.1117/12.2518484

KEYWORDS: Polarization, Crystals, Quantum communications, Calcite, Quantum memory, Photons, Temperature metrology, Interferometers, Phase measurement, Interferometry

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Interferometric stability of polarization-entangled photons in quantum repeaters for long time intervals is an important capability for future scalable quantum networks linked over distances greater than hundreds of kilometers. A quantum memory node is a necessary component of the quantum repeater, where entanglement is prepared and swapped to extend entangled states from remote to distant nodes. Room temperature fluctuations can have significant effects on phase stability of the polarization states stored in the quantum memory. Although common-path stabilization in a quantum memory has been demonstrated, passive stabilization to room temperature variations has not been realized. Our approach to the quantum memory uses a single collective excitation encoded in two separate spatial modes in a cold ensemble of rubidium atoms. The two spatial modes are combined into a single path using the birefringence of two calcite crystals. However, normal lab temperature changes introduces a phase shift between the ordinary and extraordinary pathways on the order of 2π. We demonstrate passive temperature stabilization by alignment of the ordinary path in one crystal to the extraordinary path in the second crystal and vice versa. We show a phase stability on the order of ten hours by homodyne detection of classical light modes exiting the interferometer. We corroborate the phase stability of the quantum memory with a correlation measurement between polarization states of a signal photon generated at the formation of the collective atomic excitation and a retrieved idler photon during the destruction of the atomic excitation. We measure a Bell-CHSH parameter for both the unstable configuration and for the stable configuration. For an unstable calcite crystal configuration, we do not measure a violation of the Bell-CHSH inequality¹ (S≤2) with S = 1.42 ± 0.087. For the stable calcite crystal configuration, we measure a violation of Bell-CHSH inequality (S>2) with S = 2.48±0.099.

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