Atomic quantum phase studies with a longitudinal Stern-Gerlach interferometer

Robert, J.; Miniatura, Ch.; Gorceix, O.; Boiteux, S. Le; Lorent, V.; Reinhardt, Joachim; Baudon, J.

doi:10.1051/jp2:1992155

Cited by 30 publications

(34 citation statements)

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“…The small oscillations shown in Figure 1 are consistent with the predictions for the spin transition amplitudes of atomic spins experiencing a non-adiabatic evolution in an inhomogeneous magnetic field [35], evidenced experimentally in for metastable hydrogen atoms [36,37]. This profile is independent of the considered Larmor pulsation, which has been set to ωL = 10 6 rad/s in the numerical simulation.…”

Section: Efficiency Of a Stern-gerlach Device With An Helicoidal supporting

confidence: 83%

Shortcut to adiabaticity in a Stern-Gerlach apparatus

Impens

Guéry-Odelin

2017

Phys. Rev. A

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We show that the performances of a Stern-Gerlach apparatus can be improved by using a magnetic field profile for the atomic spin evolution designed through shortcut to adiabaticity technique. Interestingly, it can be made more compact -for atomic beams propagating at a given velocityand more resilient to a dispersion in velocity, in comparison with the results obtained with a standard uniform rotation of the magnetic field. Our results are obtained using a reverse engineering approach based on Lewis-Riesenfeld invariants. We discuss quantitatively the advantages offered by our configuration in terms of the resources involved and show that it drastically enhances the fidelity of the quantum state transfer achieved by the Stern-Gerlach device.

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Section: Efficiency Of a Stern-gerlach Device With An Helicoidal supporting

confidence: 83%

Shortcut to adiabaticity in a Stern-Gerlach apparatus

Impens

Guéry-Odelin

2017

Phys. Rev. A

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“…The spectrum shows a peak around the origin with the width corresponding to the kinetic energy spread of atoms in the beam source. [S0031-9007(96) PACS numbers: 32.80.Pj Various interferometric effects of neutral atomic beams have been demonstrated in recent years [1][2][3][4][5][6][7][8][9]. However, those experiments deal with the wave nature of a single atom.…”

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confidence: 99%

Observation of Two-Atom Correlation of an Ultracold Neon Atomic Beam

1996

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The intensity correlation spectrum of an ultracold 20 Ne atomic beam in the 1s 3 ͓3s : 1 P 0 ͔ state is experimentally studied. The spectrum shows a peak around the origin with the width corresponding to the kinetic energy spread of atoms in the beam source. [S0031-9007(96) PACS numbers: 32.80.Pj Various interferometric effects of neutral atomic beams have been demonstrated in recent years [1][2][3][4][5][6][7][8][9]. However, those experiments deal with the wave nature of a single atom. This is in sharp contrast to the case of optical beams, in which interesting results on many-photon correlation effects have been studied. This is partly due to the difference in the technical level of preparing samples. The invention of lasers and following development in nonlinear optics enabled us to work with optical beams with various statistical characteristics, whereas for particles with mass the only sample available for us was a beam of uncorrelated particles. For random particles the first order correlation is constant in time, and a nontrivial spectrum can be observed only in higher order correlations. Furthermore, to observe a many-particle correlation effect, at least two particles have to be found in a single external quantum state, which was prohibitively small with a conventional particle beam. This situation has changed considerably for a neutral atomic beam owing to the laser cooling technique. In a Bose-Einstein condensate of alkali gases, which has been reported recently by several groups [10][11][12], atoms are in a highly degenerate state. Even with commonly used laser-cooling techniques it is possible to achieve a density in which the probability of finding two atoms in the same mode is in an experimentally detectable range.We report in this Letter the first observation [13] of the second order correlation of a laser-cooled atomic beam, which is the atomic analogy of the Hambury Brown and Twiss experiment on an optical source [14]. An ultracold metastable 20 Ne atomic beam in the 1s 3 ͓3s : 3 P 0 ͔ state was generated by releasing atoms from a Ne trap in the 1s 5 ͓3s : 3 P 2 ͔ state by optical pumping [15]. We restricted the area of the detector to cover only the diffraction limited portion of the atomic beam source and measured the time-interval distribution between two atoms that successively hit the detector. The temporal correlation showed a peak around the origin that corresponded to the energy distribution of the atomic beam.The joint probability P͑r 1 , t; r 2 , t 1 t͒ of finding an atom at t and r 1 and then an another atom at a later time t 1 t and r 2 is P͑r 1 , t; r 2 , t 1 t͒ ͗Cjd y ͑r 1 , t͒d y ͑r 2 , t 1 t͒ 3 d͑r 2 , t 1 t͒d͑r 1 , t͒jC͘ , where d y ͑r, t͒ and d͑r, t͒ are the operators to create and annihilate the atom at r and t, respectively. The probability P͑t͒ of detecting two atoms separated in time by t is obtained by averaging the above expression on r 1 and r 2 over the detector surface and on t. In our experimental setup the evaluation of P͑t͒ is not difficult, if the atomic beam...

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“…Since the metastable 2s state of atomic hydrogen has a very long (122 ms) natural lifetime, the possibility of a fragmentation channel of H 2 into a pair of such metastable atoms would be perfectly suited for experiments, where manipulation of phase factors and the use of Stern-Gerlach interferometric techniques [10] is pursued, including time selection of events [11], delayed choice experiments [12] or double atom interferometry related to the quantum Zeno effect [13]. On the other hand, H 2 is the simplest neutral molecule, since it is made up of only four bodies.…”

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Fast metastable hydrogen atoms from H₂molecules: twin atoms

Trimeche

Houdoux

Rahmat

et al. 2015

EPJ Web of Conferences

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Abstract. It is a difficult task to obtain "twin atoms", i.e. pairs of massive particles such that one can perform experiments in the same fashion that is routinely done with "twin photons". One possible route to obtain such pairs is by dissociating homonuclear diatomic molecules. We address this possibility by investigating the production of metastable H(2s) atoms coming from the dissociation of cold H 2 molecules produced in a Campargue nozzle beam crossing an electron beam from a high intensity pulsed electron gun. Dissociation by electron impact was chosen to avoid limitations of target molecular excited states due to selection rules. Detectors placed several centimeters away from the collision center, and aligned with respect to possible common molecular dissociation channel, analyze the neutral fragments as a function of their time-of-flight (TOF) through Lyman-detection. Evidence for the first time observed coincidence of pairs of H(2s) atoms obtained this way is presented.

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Atomic quantum phase studies with a longitudinal Stern-Gerlach interferometer

Cited by 30 publications

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Shortcut to adiabaticity in a Stern-Gerlach apparatus

Shortcut to adiabaticity in a Stern-Gerlach apparatus

Observation of Two-Atom Correlation of an Ultracold Neon Atomic Beam

Fast metastable hydrogen atoms from H₂molecules: twin atoms

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Atomic quantum phase studies with a longitudinal Stern-Gerlach interferometer

Cited by 30 publications

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Shortcut to adiabaticity in a Stern-Gerlach apparatus

Shortcut to adiabaticity in a Stern-Gerlach apparatus

Observation of Two-Atom Correlation of an Ultracold Neon Atomic Beam

Fast metastable hydrogen atoms from H2molecules: twin atoms

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Fast metastable hydrogen atoms from H₂molecules: twin atoms