Observation of velocity-tuned multiphoton ‘‘Doppleron’’ resonances in laser-cooled atoms

Tollett, J. J.; Chen, J.; Story, J. G.; Ritchie, N. W. M.; Bradley, C. C.; Hulet, Randall G.

doi:10.1103/physrevlett.65.559

Cited by 39 publications

(12 citation statements)

References 10 publications

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“…The numerous narrow spikes in Fig. 3 are not numerical noise, but higher-order resonances somewhat related to "doppleron" resonances [15,16]. They are typically unobservable under experimental conditions due to decoherence and deviations from pure two-level behavior.…”

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confidence: 99%

Four-color stimulated optical forces for atomic and molecular slowing

2013

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Stimulated optical forces offer a simple and efficient method for providing optical forces far in excess of the saturated radiative force. The bichromatic force, using a counterpropagating pair of two-color beams, has so far been the most effective of these stimulated forces for deflecting and slowing atomic beams. We have numerically studied the evolution of a two-level system under several different bichromatic and polychromatic light fields, while retaining the overall geometry of the bichromatic force. New insights are gained by studying the time-dependent trajectory of the Bloch vector, including a better understanding of the remarkable robustness of bi-and polychromatic forces with imbalanced beam intensities. We show that a four-color polychromatic force exhibits great promise. By adding new frequency components at the third harmonic of the original bichromatic detuning, the force is increased by nearly 50% and its velocity range is extended by a factor of three, while the required laser power is increased by only 33%. The excited-state fraction, crucial to possible application to molecules, is reduced from 41% to 24%. We also discuss some important differences between polychromatic forces and pulse trains from a high-repetition-rate laser.

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confidence: 99%

Four-color stimulated optical forces for atomic and molecular slowing

2013

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“…2e for v > 20) [13]. In addition, for large k ee ′ , Doppleron resonant coupling to |ẽ ′ (x) [20] occurs at moderate speeds v with 2nk ee ′ v ≈ ∆ for integer n (the sharp dips of the black curve in Fig. 2e near v = 70, 80), and leads to heating.…”

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confidence: 99%

Pulsed Sisyphus Scheme for Laser Cooling of Atomic (Anti)Hydrogen

Brown

Phillips

et al. 2011

Phys. Rev. Lett.

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We propose a laser cooling technique in which atoms are selectively excited to a dressed metastable state whose light shift and decay rate are spatially correlated for Sisyphus cooling. The case of cooling magnetically trapped (anti)hydrogen with the 1S-2S-3P transitions by using pulsed ultraviolet and continuous-wave visible lasers is numerically simulated. We find a number of appealing features including rapid three-dimensional cooling from ∼1 K to recoil-limited, millikelvin temperatures, as well as suppressed spin-flip loss and manageable photoionization loss.

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“…which can be accomplished by means of doppleron absorbers [24], photon-number resolving detectors, or Nfold coincidence counting. The last two approaches are more convenient than the first, as they exploit the full photon statistics so that the N value need not be predetermined.…”

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confidence: 99%

“…This situation can be simulated, at least in principle, by inserting immediately in front of the lens a screen divided into small sections each of area s F such that if less than N photons reach one section, they are absorbed, otherwise they are coherently transmitted. Such a screen does not currently exist, but in principle one could be built, e.g., by using doppleron materials [24]. Then, if the object is illuminated by the focused coherent states described above, only N photons that originate at r o , successfully transit the screen within one of its area-s F segments, and get detected at r i can can contribute to the image at that point.…”

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confidence: 99%

Sub-Rayleigh-diffraction-bound quantum imaging

et al. 2009

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The spatial resolution of an imaging apparatus is limited by the Rayleigh diffraction bound, a consequence of the imager's finite spatial extent. We show some N-photon strategies that permit resolution of details that are smaller than this bound, attaining either a 1 / ͱ N enhancement ͑standard quantum limit͒ or a 1/ N enhancement ͑Heisenberg-like scaling͒ over standard techniques. In the incoherent imaging regime, the methods presented are loss resistant, since classical light sources suffice. Our results may be of importance in many applications: microscopy, telescopy, lithography, metrology, etc. Quantum effects have been used successfully to provide resolution enhancement in imaging procedures. Among the many proposals that have been made ͓1͔, arguably the most famous is the quantum lithography procedure ͓2͔. These methods take advantage of the fact that the effective wavelength of a multiphoton light state is shorter than its electromagnetic field wavelength: the light generation, propagation, and detection can be performed at optical wavelengths, where it is simple to manipulate, whereas the quantum correlations in the employed states allow one to perform imaging at the shorter multiphoton wavelength. Such proposals are then based on entangled or squeezed light sources, as entanglement or squeezing are necessary for efficient quantum enhancements ͓3͔. If, however, efficiency considerations are dropped, it is also possible to employ classical-state light sources and post-selection at the detection stage to filter desirable quantum states from the classical light ͓4͔. In fact, in many practical situations efficiency considerations do not play any role, as the quantum enhancement is typically of the order of the square root of the number of entangled systems ͓3͔, whereas in practical situations the complexity of generating the required quantum states has a much worse scaling. Many post-selection imaging procedures employing only classical light sources have been proposed and analyzed ͓5-17͔, and cover a wide range of interesting situations. Analogous methods have been employed successfully also in fields not directly related to imaging ͓18͔.Here we show how one can achieve a resolution enhancement beyond what the apparatus' structural limits impose for conventional imaging, i.e., the Rayleigh diffraction bound x R . In particular we show that employing appropriate light sources together with N-photon coincidence photodetection yields a resolution ϳx R / ͱ N. A resolution ϳx R / N can also be obtained by introducing, at the lens, a device that is opaque when it is illuminated by fewer than N photons. The first type of enhancement-a 1 / ͱ N standard quantum limit ͑SQL͒ for imaging-is an N-photon quantum process, but it is roughly equivalent to the classical procedure of averaging the arrival positions of N photons that originate from the same point on the object. The second type of enhancement-a 1 / N Heisenberg-like scaling for imagingis a quantum phenomenon that derives from treating the N photons as a single...

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Observation of velocity-tuned multiphoton ‘‘Doppleron’’ resonances in laser-cooled atoms

Cited by 39 publications

References 10 publications

Four-color stimulated optical forces for atomic and molecular slowing

Four-color stimulated optical forces for atomic and molecular slowing

Pulsed Sisyphus Scheme for Laser Cooling of Atomic (Anti)Hydrogen

Sub-Rayleigh-diffraction-bound quantum imaging

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