Coherence of bose condensates

Wallis, H.; Röhrl, A.; Naraschewski, M.; Schenzle, A.; Miesner, H.-J.

doi:10.1080/09500349708231844

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…The wavefunction for this ground state then plays a role analogous to the amplitude of a coherent field for the condensate [8][9][10][11]. Numerical simulations based on the ground-state wavefunction are in very good agreement with the results of experiment [12,13].…”

Section: Introductionsupporting

confidence: 57%

Coherence length for a trapped Bose gas

Barnett¹,

Franke‐Arnold²,

Arnold³

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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Matter waves can be assigned a coherence length analogous to the corresponding quantity in optics. We show that there is a dramatic increase in coherence length associated with the appearance of Bose-Einstein condensation in a trapped ideal Bose gas. The large increase in coherence length occurs even for temperatures just below the critical temperature at which only a small proportion of the trapped atoms is to be found in the ground state.

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Section: Introductionsupporting

confidence: 57%

Coherence length for a trapped Bose gas

Barnett¹,

Franke‐Arnold²,

Arnold³

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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“…The achievement of Bose-Einstein condensation in dilute alkali gases [2][3][4], however, has revived interest in such direct experimental access. Indeed, after a number of theoretical studies [5][6][7][8][9][10][11], it has become possible to demonstrate off-diagonal long range order as made manifest by an interference experiment [12] and that finding has been confirmed by excellent agreement between experiment and theory [13,14].…”

Section: Introductionmentioning

confidence: 99%

Spatial coherence and density correlations of trapped Bose gases

1999

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We study first and second order coherence of trapped dilute Bose gases using appropriate correlation functions. Special attention is given to the discussion of second order or density correlations. Except for a small region around the surface of a Bose-Einstein condensate the correlations can be accurately described as those of a locally homogeneous gas with a spatially varying chemical potential. The degrees of first and second order coherence are therefore functions of temperature, chemical potential, and position. The second order correlation function is governed both by the tendency of bosonic atoms to cluster and by a strong repulsion at small distances due to atomic interactions. In present experiments both effects are of comparable magnitude. Below the critical temperature the range of the bosonic correlation is affected by the presence of collective quasi-particle excitations. The results of some recent experiments on second and third order coherence are discussed. It is shown that the relation between the measured quantities and the correlation functions is much weaker than previously assumed.Comment: RevTeX, 25 pages with 7 Postscript figure

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“…Output coupling realizes a crucial element in turning a Bose condensate into an atom laser [14], although the sudden release of a condensate by switching off the trapping potential can already be regarded as a crude form of such a laser. The creation of a controlled, quasicontinuous output from a Bose condensate would allow one to monitor the phase of a condensate and study phase diffusion and other decoherence processes, as recently suggested by several authors [12,[15][16][17][18][19][20].…”

mentioning

confidence: 99%

“…If the rf coupling scheme is applied to two condensates, observations of the interference between output pulses from each of the condensates can create a definite phase relation between the two trapped condensates through the quantum measurement process. Measurements on subsequent pulses can then be used to verify the initial phase measurement (for a noninteracting condensate) or to observe the phase diffusion due to the mean-field interaction [12,[15][16][17][18][19][20]. For an ideal Bose condensate, repetitive pulses as observed in Fig.…”

mentioning

confidence: 99%

Output Coupler for Bose-Einstein Condensed Atoms

et al. 1997

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We have demonstrated an output coupler for Bose condensed atoms in a magnetic trap. Short pulses of rf radiation were used to create Bose condensates in a superposition of trapped and untrapped hyperfine states. The fraction of out-coupled atoms was adjusted between 0% and 100% by varying the amplitude of the rf radiation. This configuration produces output pulses of coherent atoms and can be regarded as a pulsed "atom laser." [S0031-9007(96)02255-7]

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Coherence of bose condensates

Cited by 9 publications

References 22 publications

Coherence length for a trapped Bose gas

Coherence length for a trapped Bose gas

Spatial coherence and density correlations of trapped Bose gases

Output Coupler for Bose-Einstein Condensed Atoms

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