Evolution of coherent dark states

Liu, L.; Bellanca, M. J.; Metcalf, Harold

doi:10.1103/physreva.65.043401

Cited by 9 publications

(13 citation statements)

References 11 publications

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“…1 of Ref. [5]). Atoms moving V VSR ≡ ω z /k experience a linearly polarized electric field vector that 'rotates' at precisely their Larmor frequency in the atomic reference frame, therefore they remain orthogonal to the field and thus stay in the dark state.…”

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confidence: 88%

“…In this Letter, we review our experiment that generated an ultra-slow atomic beam of metastable helium by velocity selective resonance (VSR). [4,5] Then we present a model to produce an ultra-slow atomic beam of 87 Rb from a magneto-optical trap (MOT) or an optical molasses. With VSR the velocity of the atomic beam is determined by an applied magnetic field, and the launch temperature of the atoms may be below T r .…”

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confidence: 99%

“…The state |Ψ N C is dark to the laser fields because the amplitudes for excitation of each of its two constituents have equal magnitudes but opposite signs, and thus atomic population is trapped in |Ψ N C . If a magnetic field B is applied along the kvectors (z-axis) of the light field, the M J = ±1 states undergo opposite Zeeman shifts ±hω z , and the stationary (trapped) condition is met for atoms moving at velocity V VSR ≡ −ω z /k [4,5] . The electric field of such laser beams has the wellknown "corkscrew" configuration.…”

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confidence: 99%

“…For B = 0 = ω Z , V VSR = 0 and the situation is identical to VSCPT. [4,5] The consequence of |Ψ N C being a dark state is that atoms can be accumulated at v = V VSR , which depends only on the applied magnetic field B. Because the state given by Eq.…”

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confidence: 99%

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Ultra-Slow Atomic Beam Generation by Velocity Selective Resonance

Cheng

Wang

et al. 2008

Chinese Phys. Lett.

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We describe a method to generate an ultra-slow atomic beam by velocity selective resonance (VSR). A VSR experiment on a metastable helium beam in a magnetic field is presented and the results show that the transverse velocity of the deflected beam can be cooled and precisely controlled to less than the recoil velocity, depending on the magnitude of the magnetic field. We extend this idea to a cold atomic cloud to produce an ultra-slow 87 Rb beam that can be used as a source of an atomic fountain clock or a space clock.

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confidence: 99%

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Ultra-Slow Atomic Beam Generation by Velocity Selective Resonance

Cheng

Wang

et al. 2008

Chinese Phys. Lett.

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“…Population control in quantum systems, namely transfer of electrons from an ensemble of atoms all in the same initial state to specified final states, is used in problems ranging from coherent population trapping [1, 2,3,4,5], including electromagnetically induced transparency [6,7,8,9], and quantum computing [10,11,12,13,14,15,16], to chemical dynamics [17,18]. These problems are modeled in terms of an n-level (often 3-level) atom interacting with a strong external field [19,20,21,22,23,24].…”

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Complete population transfer in a degenerate three-state atom

Rakhimov¹,

Shakov²,

McGuire³

2004

Phys. Rev. A

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We find conditions required to achieve complete population transfer, via coherent population trapping, from an initial state to a designated final state at a designated time in a degenerate 3-level atom, where transitions are caused by an external interaction. Complete population transfer from an initially occupied state 1 to a designated state 2 occurs under two conditions. First, there is a constraint on the ratios of the transition matrix elements of the external interaction. Second, there is a constraint on the action integral over the interaction, or "area", corresponding to the phase shift induced by the external interaction. Both conditions may be expressed in terms of simple odd integers.

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