Enhancing strontium clock atom interferometry using quantum optimal control

Chen, Zilin; Louie, Garrett; Wang, Yiping; Deshpande, Tejas; Kovachy, Tim

doi:10.1103/physreva.107.063302

Cited by 6 publications

(2 citation statements)

References 88 publications

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“…The idea is to exploit some particularities of quantum systems, such as ability to form quantum superpositions or even quantum entanglement, which can be very sensitive to environmental conditions and thus react very sensitively to external forces. Quantum sensors are currently used in many fields of fundamental physics, including cosmology in the search for dark matter (21)(22)(23)(24)(25)(26).…”

Section: Quantum Sensing and Metrologymentioning

confidence: 99%

“…Non-classical quantum correlation, such as spin-squeezing (40), super-radiant clocks, and lasers (39,42) have been investigated and strontium-based experiments aimed at testing fundamental laws of physics have been designed (41,43,44). Lastly, many laboratories worldwide have developed strontium atomic interferometers (21,42,44,45).…”

Section: Quantum Sensing and Metrologymentioning

confidence: 99%

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Matter-wave interferometry for quantum sensing

Pessoa Junior

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This dissertation reports on advancements in the construction of a quantum sensor for gravimetry based on matter interferometry. Ultra-cold strontium atoms (in the order of 1 µK) within a ring cavity in the bad cavity regime constitute the experimental setup and two distinct approaches were adopted for the comprehension of the system's operation. The first involved simulations of Ramsey-Bordé pulse sequence, specifically the π/2-π-π/2-spin echo sequence using the 689 nm transition of strontium. The sequence is commonly employed in matter interferometers and the simulations provided insights for future measurements. The expected precision of our system is within ∆g/g < 10 −8 , showcasing its potential accuracy. The second approach focused on monitoring Bloch oscillations resulting from the interaction between atoms and cavity light, which induces a frequency proportional to the external force, in our case, gravity. Efforts were made during the experiment towards confirming the system's regime, leading to a significant observation of nonlinear Normal-mode splitting due to high saturation in the strong coupling regime, exhibiting a bi-stable behaviour.

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Section: Quantum Sensing and Metrologymentioning

confidence: 99%

Section: Quantum Sensing and Metrologymentioning

confidence: 99%

Matter-wave interferometry for quantum sensing

Pessoa Junior

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Test of the gravitational redshift with single-photon-based atomic clock interferometers

Liu,

Xu,

Luo

et al. 2024

Quantum Front

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The gravitational redshift (GR), as predicted by Einstein’s general theory of relativity, posits that two identical clocks situated at different gravitational potentials will tick at different rates. In this study, we explore the impact of the GR on a single-photon-based atom interferometer and propose a corresponding testing scheme. Our approach conceptualizes the atom interferometer as two coherent atomic clocks positioned at distinct elevations, which is referred to as an atomic clock interferometer, allowing us to derive the GR-induced phase shift. This effect becomes significant due to the notable energy difference between the two atomic internal states, comparable to other relativistic effects in single-photon-based atomic clock interferometers. Furthermore, our proposed scheme incorporates the velocity of the laser device to effectively mitigate other relativistic effects. The ensuing analysis indicates an anticipated GR test precision at the 10−5 level for our proposed approach.

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Enhancing the sensitivity of atom-interferometric inertial sensors using robust control

Saywell,

Carey,

Light

et al. 2023

Nat Commun

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Atom-interferometric quantum sensors could revolutionize navigation, civil engineering, and Earth observation. However, operation in real-world environments is challenging due to external interference, platform noise, and constraints on size, weight, and power. Here we experimentally demonstrate that tailored light pulses designed using robust control techniques mitigate significant error sources in an atom-interferometric accelerometer. To mimic the effect of unpredictable lateral platform motion, we apply laser-intensity noise that varies up to 20% from pulse-to-pulse. Our robust control solution maintains performant sensing, while the utility of conventional pulses collapses. By measuring local gravity, we show that our robust pulses preserve interferometer scale factor and improve measurement precision by 10× in the presence of this noise. We further validate these enhancements by measuring applied accelerations over a 200 μg range up to 21× more precisely at the highest applied noise level. Our demonstration provides a pathway to improved atom-interferometric inertial sensing in real-world settings.

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Enhancing strontium clock atom interferometry using quantum optimal control

Cited by 6 publications

References 88 publications

Matter-wave interferometry for quantum sensing

Matter-wave interferometry for quantum sensing

Test of the gravitational redshift with single-photon-based atomic clock interferometers

Enhancing the sensitivity of atom-interferometric inertial sensors using robust control

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