Temperature determination of cold atoms based on single-atom countings

Zhang, Pengfei; Guo, Yanqiang; Li, Zhuoheng; Zhang, Yuchi; Zhang, Yanfeng; Du, Jinjin; Li, Gang; Wang, Junmin; Zhang, Tiancai

doi:10.1364/josab.28.000667

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…The results of our numerical simulations of a large number of possible dynamical histories of the system are presented in Figs. 2(c) and 3(c) for max t Ω(x(t), 0)/Γ ∼ 10 2 , which is a regime that can be achieved experimentally [20,38] [in Fig. 3(c) we address the suboptimal case of α = 0.9 simply for convenience of calculations in light of the size of the truncated Hilbert space within which we have performed our quantum-jump calculations].…”

Section: A Discussion Of the Resultsmentioning

confidence: 97%

Transferring entanglement to the steady state of flying qubits

Guo

Zhang

et al. 2012

Phys. Rev. A

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The transfer of entanglement from optical fields to qubits provides a viable approach to entangling remote qubits in a quantum network. In cavity quantum electrodynamics, the scheme relies on the interaction between a photonic resource and two stationary intra-cavity atomic qubits. However, it might be hard in practice to trap two atoms simultaneously and synchronize their coupling to the cavities. To address this point, we propose and study entanglement transfer from cavities driven by an entangled external field to controlled flying qubits. We consider two exemplary non-Gaussian driving fields: NOON and entangled coherent states. We show that in the limit of long coherence time of the cavity fields, when the dynamics is approximately unitary, entanglement is transferred from the driving field to two atomic qubits that cross the cavities. On the other hand, a dissipationdominated dynamics leads to very weakly quantum-correlated atomic systems, as witnessed by vanishing quantum discord.

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Section: A Discussion Of the Resultsmentioning

confidence: 97%

Transferring entanglement to the steady state of flying qubits

Guo

Zhang

et al. 2012

Phys. Rev. A

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“…In principle, the fourfold degeneracy in the case of the TEM 10 mode with a vertical-oriented nodal line (see Figure 7(b)) and the duplicate degeneracy in the case of the TEM 01 mode with a horizon-oriented nodal line (see Figure 7(d)) will be eliminated completely because the mode symmetry is broken. Fortunately, our high-finesse micro-cavity has ~ 45-degree-tilted TEM 10 and TEM 01 modes, as shown in Figure 8. The frequency splitting between the TEM 10 and TEM 01 modes is ~ 82.5 MHz, so it is very easy to distinguish them.…”

Section: Determination Of the Trajectory Of Individual Atoms Passing mentioning

confidence: 91%

“…The inset shows the resonance peaks of the TEM 00 , TEM10 and TEM 01 modes. The frequency splitting between the TEM 10 and TEM 01 modes is ~ 82.5 MHz.…”

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confidence: 99%

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Realization and application of strong coupling of single cesium atoms with TEM 00 and TEM 10 modes of a high-finesse Fabry-Perot cavity

Wang

Zhang

et al. 2012

SPIE Proceedings

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Strong coupling of single cesium atoms with a high-finesse optical micro-cavity (the finesse of our Fabry-Perot-type micro-cavity is F = 3.3 x 10 5 and the cavity length is l c = 86 μm) has been realized for the both cases of TEM 00 and TEM 10 cavity modes in our experiments. The typical parameters are (g 00 , κ, γ) = 2π x (23.9, 2.6, 2.6) MHz and (g 10 , κ, γ) = 2π x (20.5, 2.6, 2.6) MHz for these two cases, respectively. Obviously our system reaches the strong coupling regime. The first application is to adopt strong coupling of free-fall individual atoms with the TEM 00 cavity mode for determining the effective temperature of laser-cooled atoms prepared in a magneto-optical trap located just above the micro-cavity. The second application is to employ strong coupling of free-fall individual atoms with the tilted TEM 10 cavity mode, in stead of TEM 00 mode, for more precisely tracking the trajectories of atoms passing through the cavity mode.

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“…Each involves the signal from only a small number of atoms, and there are artefacts from the initial cloud size and measurement-induced perturbation of the velocity distribution. Despite a variety of enhancements [8][9][10], precise interpretation of the results requires care [5,11].…”

Section: Introductionmentioning

confidence: 99%

Velocimetry of cold atoms by matter-wave interferometry

et al. 2019

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We present an elegant application of matterwave interferometry to the velocimetry of cold atoms whereby, in analogy to Fourier transform spectroscopy, the 1-D velocity distribution is manifest in the frequency domain of the interferometer output. By using stimulated Raman transitions between hyperfine ground states to perform a three-pulse interferometer sequence, we have measured the velocity distributions of clouds of freely-expanding 85 Rb atoms with temperatures of 34 µK and 18 µK. Quadrature measurement of the interferometer output as a function of the temporal asymmetry yields velocity distributions with excellent fidelity. Our technique, which is particularly suited to ultracold samples, compares favourably with conventional Doppler and time-of-flight techniques, and reveals artefacts in standard Raman Doppler methods. The technique is related to, and provides a conceptual foundation of, interferometric matterwave accelerometry, gravimetry and rotation sensing.

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Temperature determination of cold atoms based on single-atom countings

Cited by 13 publications

References 18 publications

Transferring entanglement to the steady state of flying qubits

Transferring entanglement to the steady state of flying qubits

Realization and application of strong coupling of single cesium atoms with TEM 00 and TEM 10 modes of a high-finesse Fabry-Perot cavity

Velocimetry of cold atoms by matter-wave interferometry

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