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Jinpeng Yuan et al.
Summary: In this study, the generation of 1D and 2D vortex-beam arrays is proposed and demonstrated using forked-photonic lattices in a three-level Rb-85 atomic medium. The input Gaussian probe beam experiences phase superposition and is diffracted into vortex-beam arrays. The efficiency of high-order diffractions can be enhanced by tuning the two-photon detuning and power of the coupling beams. The experimental results agree well with numerical simulations, suggesting that atomic systems are a fertile platform for creating and controlling vortex-beam arrays.
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Yafen Cai et al.
Summary: Due to the exaggerated properties of highly excited atomic states, a Rydberg-atom-based microwave receiver holds promise for achieving superior performances in microwave metrology and communication compared to conventional antennas. However, developing long-distance communication applications based on Rydberg atomic receiver remains challenging due to the simultaneous requirements of low bit error rate (BER), high symbol rate, and weak carrier amplitude. The key to tackling this problem is to encode the information with a proper scheme that maintains high sensitivity and robustness of the Rydberg atomic receiver. By using Rydberg atom-based heterodyne detection for the reception of phase-modulated microwave field, we demonstrated more than one order of magnitude improvement in reception sensitivity compared to the previously investigated amplitude-modulation scheme. Therefore, we achieved low BER communication with a high symbol rate of 12 k bit/s and a weak carrier amplitude of 13 mu V cm-1 simultaneously. Furthermore, we also demonstrated the compatibility of our scheme with frequency-division-multiplexing communication.
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Summary: The Rydberg atom-based microwave electric field sensor has high sensitivity for weak RF-field detection. Selection of Rydberg states with larger electric dipole moment is beneficial to enhance the sensitivity, and we choose Rydberg states with its principal quantum number up to n similar to 80. We study the probe laser transmission response to a microwave field for these chosen high Rydberg states at room temperature. It agrees well with theoretical simulation based on an optical Bloch equation with considered microwave-atom interaction and Doppler broadening effect. In our experiment, the microwave sensing sensitivity based on 85Rb transition vertical bar 78S > -> vertical bar 78P(3/2)> arrives at 5.102(49) nV cm(-1) Hz(-1/2) at 1 kHz.
APPLIED PHYSICS LETTERS
(2023)
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Summary: A Rydberg atom-based mixer was developed to measure the phase of a radio frequency (RF) field by converting it to an all-optical phase detector through amplitude modulation (AM) of the LO RF field. The study shows a linear relationship between the amplitude of the beat signal and the phase of the SIG RF field within a certain range.
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Summary: Combining Rydberg atoms with a deep learning model allows for the sensitivity of Rydberg atoms to be utilized while reducing the impact of noise, without the need to solve the master equation. This technology is expected to benefit Rydberg-based MW field sensing and communication.
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D. A. Anderson et al.
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Shaohua Li et al.
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FRONTIERS IN PHYSICS
(2022)
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Optics
Jinpeng Yuan et al.
Summary: A mechanism for improving the sensitivity of microwave electric field measurement is presented using dual-MW-dressed electromagnetically induced transparency in a Rb-85 atomic coherent system. By introducing an auxiliary MW field and adjusting its frequency and power, the sensitivity of MW E-field measurement is improved by about two orders of magnitude. This mechanism is applicable for all frequency bands covered by Rydberg energy levels and opens up a novel pathway for high-sensitivity MW E-field measurement with Rydberg atoms.
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(2022)
Article
Optics
Li-Zheng Liu et al.
Summary: This research demonstrates the use of discrete variables in distributed quantum phase estimation, achieving improved phase measurement accuracy through parallel mode entanglement and multiple passes of a phase shifter.
Article
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Amy K. Robinson et al.
Summary: The study demonstrates the use of a Rydberg atom-based sensor for determining the angle of arrival of an incident RF wave by measuring phase differences inside an atomic vapor cell. Comparisons with simulation and theory show the potential for using atom-based phase measurements to determine the angle of arrival of an RF field.
APPLIED PHYSICS LETTERS
(2021)
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Shaohua Li et al.
Summary: We measured the quantum defects of Rb-85 P-3/2 and F-7/2-series Rydberg levels in a room temperature vapor cell using microwave-assisted EIT spectroscopy, obtaining accurate results through a novel microwave optical three-photon excitation method and measurements of Stark shifts. Forced extraction of quantum defects was done using a modified Rydberg-Ritz formula, providing a check on advanced theoretical calculations and promoting the application of quantum simulations and sensors.
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(2021)
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Feng-Dong Jia et al.
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