Precision Measurements of s-wave Scattering Lengths in a Two-Component Bose-Einstein Condensate

Egorov, M. V.; Ivannikov, Valentin; Opanchuk, Bogdan; Hall, Budd L.; Hannaford, Peter; Sidorov, Andrei

doi:10.1364/iqec.2011.i1034

Cited by 2 publications

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“…3(a) were obtained for 1.25(40) × 10 4 atoms at a temperature of 320 (20) nK held in a confined trap {16.9, 451, 390} Hz, corresponding to n ≈ 1.24 (40). In the present situation, the coherence time is T 2 = 3.0(4) s and is mainly limited by the atom loss during T R that has a decay time of 3.2(2) s. This loss is probably due to spin exchanging collisions from atoms in state |1 towards the states |F = 2, m F = 0 (untrapped) and |F = 2, m F = 2 (trapped) [38]. One typical signature of this loss channel is the asymmetry of the probability for large T R .…”

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confidence: 81%

Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

et al. 2013

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The coherence of quantum systems is crucial to quantum information processing. Although superconducting qubits can process quantum information at microelectronics rates, it remains a challenge to preserve the coherence and therefore the quantum character of the information in these systems. An alternative is to share the tasks between different quantum platforms, for example, cold atoms storing the quantum information processed by superconducting circuits. Here we characterize the coherence of superposition states of 87 Rb atoms magnetically trapped on a superconducting atom chip. We load atoms into a persistent-current trap engineered next to a coplanar microwave resonator structure, and observe that the coherence of hyperfine ground states is preserved for several seconds. We show that large ensembles of a million of thermal atoms below 350 nK temperature and pure Bose-Einstein condensates with 3.5 Â 10 5 atoms can be prepared and manipulated at the superconducting interface. This opens the path towards the rich dynamics of strong collective coupling regimes.

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confidence: 81%

Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

et al. 2013

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“…Natural units for the Bogoliubov-de Gennes (BdG) equations in a linear potential V = −F z. The interaction constant in the quasi-1D geometries (first and second line) is g = 2hω ⊥ a s with transverse trapping frequency ω ⊥ /2π = 10 kHz and s-wave scattering length a s = 95 a 0 for Rb87 (Egorov et al, 2011). The trapped systems are considered in a harmonic confinement, the potential being linearised at the Thomas-Fermi radius.…”

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confidence: 99%

“…( 5) (Egorov et al 2011). The trapped systems are considered in a harmonic confinement, the potential being linearized at the Thomas-Fermi radius.…”

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confidence: 99%

Excitations at the border of a condensate

Diallo

Henkel

2015

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

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Abstract. We solve the Bogoliubov-de Gennes equations for an inhomogeneous condensate in the vicinity of a linear turning point. A stable integration scheme is developed using a transformation into an adiabatic basis. We identify boundary modes trapped in a potential whose shape is similar to a Hartree-Fock mean-field treatment. These modes are nonresonantly excited when bulk modes reflect at the turning point and contribute significantly to the spectrum of local density fluctuations.

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Precision Measurements of s-wave Scattering Lengths in a Two-Component Bose-Einstein Condensate

Cited by 2 publications

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Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

Excitations at the border of a condensate

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