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Electromagnetically induced holographic imaging with Rydberg atoms
摘要： Electromagnetically induced holographic imaging using strongly interacting Rydberg atoms is investigated via electromagnetically induced grating (EIG). We consider two schemes, i.e., by direct detection of holographic imaging pattern, known as electromagnetically induced classical holographic imaging (EICHI), and by employing entangled photon pairs for imaging which is called as electromagnetically induced quantum holographic imaging (EIQHI). Both the schemes are employed to obtain 1D and 2D holographic imaging. In EICHI and EIQHI, amplitude and phase information of EIG can be imaged with controllable image variation in size. It is noticed that holographic imaging is influenced by van der Waals (vdW) effect present in Rydberg atoms.
关键词： Electromagnetically induced grating,Rydberg atoms,Quantum imaging,Electromagnetically induced holographic imaging,van der Waals effect
更新于2025-09-23 15:23:52
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Coupling Rydberg Atoms to Microwave Fields in a Superconducting Coplanar Waveguide Resonator
摘要： Rydberg helium atoms traveling in pulsed supersonic beams have been coupled to microwave fields in a superconducting coplanar waveguide (CPW) resonator. The atoms were initially prepared in the 1s55s 3S1 Rydberg level by two-color two-photon laser excitation from the metastable 1s2s 3S1 level. Two-photon microwave transitions between the 1s55s 3S1 and 1s56s 3S1 levels were then driven by the 19.556 GHz third-harmonic microwave field in a quarter-wave CPW resonator. This superconducting microwave resonator was fabricated from niobium nitride on a silicon substrate and operated at temperatures between 3.65 and 4.30 K. The populations of the Rydberg levels in the experiments were determined by state-selective pulsed electric field ionization. The coherence of the atom-resonator coupling was studied by time-domain measurements of Rabi oscillations.
关键词： quantum electrodynamics,Rydberg atoms,microwave fields,superconducting coplanar waveguide resonator
更新于2025-09-23 15:21:01
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Laser Trapping of Circular Rydberg Atoms
摘要： Rydberg atoms are remarkable tools for quantum simulation and computation. They are the focus of an intense experimental activity, mainly based on low-angular-momentum Rydberg states. Unfortunately, atomic motion and levels lifetime limit the experimental timescale to about 100 μs. Here, we demonstrate two-dimensional laser trapping of long-lived circular Rydberg states for up to 10 ms. Our method is very general and opens many opportunities for quantum technologies with Rydberg atoms. The 10 ms trapping time corresponds to thousands of interaction cycles in a circular-state-based quantum simulator. It is also promising for quantum metrology and quantum information with Rydberg atoms, by bringing atom-field interaction times into unprecedented regimes.
关键词： circular Rydberg states,quantum computation,Rydberg atoms,quantum simulation,laser trapping
更新于2025-09-23 15:19:57
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Measurement of the Rydberg Constant with Trapped Rydberg Atoms
摘要： A measurement of the Rydberg constant using cold circular Rydberg atoms is proposed. Since these atoms have long lifetimes, negligible quantum electrodynamics and no nuclear-overlap corrections, the measurement can shed new light on the “proton radius puzzle”. The atoms are trapped in an optical lattice. Transitions are driven using a lattice-modulation technique to perform Doppler-free sub-THz spectroscopy; the transition frequencies yield the Rydberg constant. The selected transitions are free of ?rst-order Zeeman and Stark shifts. Systematic uncertainties due to lattice-induced shifts, core-polarization, second-order Zeeman and Stark shifts, etc are estimated.
关键词： optical lattice,proton radius,sub-THz spectroscopy,Rydberg constant,precision measurements,Rydberg atoms
更新于2025-09-10 09:29:36
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Evolution of Atomic Entanglement for Different Cavity-Field Statistics in Single-Mode Two-Photon Process
摘要： We study the evolution of entanglement for a pair of two-level Rydberg atoms passing one after the other into an ideal cavity filled with a single mode radiation field. The atoms interact with the cavity field via two-photon transitions. The initial joint state of two atoms that enter the cavity one after the other is unentangled. Interactions intervened by the single mode cavity photon field brings out the final two-atom mixed entangled type state. We use the well known measure appropriate for the mixed states, i.e. the entanglement of formation to quantify the entanglement. We calculate the entanglement of formation of the joint two-atom state as a function of the Rabi angle, for the Fock state field, coherent field and thermal field respectively inside the cavity. The change in the magnitude of atomic entanglement with cavity photon number has been discussed.
关键词： cavity quantum electrodynamics,two-photon transitions,entanglement of formation,entanglement,Rydberg atoms
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - High-Intensity Electric Field Measurements with Rydberg Vapors
摘要： Measurements of radio-frequency (RF) electric fields using EIT spectroscopy of Rydberg states in atomic vapors have garnered significant interest in recent years. Here we describe recent work extending the approach to measurements of high-intensity RF electric fields above 1 kV/m and continuous-frequency RF measurement capability.
关键词： RF,metrology,electric field measurements,quantum sensors,Rydberg atoms
更新于2025-09-10 09:29:36
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State resolved investigation of F?rster resonant energy transfer in collisions between polar molecules and Rydberg atoms
摘要： We perform a comprehensive investigation of F?rster resonant energy transfer in a room-temperature thermal mixture of ammonia molecules and rubidium Rydberg atoms. Fully state-resolved measurement of the Rydberg-atom populations is achieved by combining millimeter-wave state transfer with state-selective ?eld ionization. This allows aspects of the energy transfer process such as state dependence, ammonia pressure dependence, and dependence on the energy resonance condition to be investigated in detail. Our results pave the way for future quantum experiments combining polar molecules and Rydberg atoms.
关键词： state dependent collisions,polar molecules,Rydberg atoms,F?rster resonant energy transfer
更新于2025-09-09 09:28:46
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Dynamics of two Rydbeg atoms successively interacting with a detuned thermal field
摘要： The entanglement between two identical two-level atoms successively passing a vacuum or a thermal cavity has been investigated taking into account the detuning. The cases when atoms are initially prepared in the separable two-atom or Bell type entangled atomic states have been considered. It has been shown that thermal ?eld can produce the entanglement between Rydberg atoms successively passing a cavity for all considered initial atomic states. For separable initial atomic states and vacuum state of the cavity the presence of detuning leads to decreasing of the degree of atomic entanglement. For entangled initial atomic states and vacuum state of the cavity the presence of detuning leads to decreasing of the entanglement amplitude oscillations. We have also derived that for thermal ?eld the increasing of the mean photon number leads to decreasing of the entanglement, but the entanglement increases as the detuning increases. For thermal ?eld and small detuning we have established that the e?ect of sudden death and birth of entanglement takes place and that for large detuning such e?ect vanishes. Results of the computer simulation are presented.
关键词： thermal cavity,Rydberg atoms,entanglement,detuning
更新于2025-09-04 15:30:14