Spin Decoherence in Superconducting Atom Chips

Skagerstam, Bo-Sture; Hohenester, Ulrich; Eiguren, Asier; Rekdal, Per Kristian

doi:10.1103/physrevlett.97.070401

Cited by 54 publications

(96 citation statements)

References 34 publications

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“…It turns out that Eqs. (21)(22)(23) can still be used, provided the assumption |ǫ(ω)| ≫ 1 holds. This is indeed the case for a typical atomic magnetic dipole moment and a conducting surface.…”

Section: B Distance Dependence Of the Green's Tensorsmentioning

confidence: 99%

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Temperature dependence of the magnetic Casimir-Polder interaction

et al. 2009

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We analyze the magnetic dipole contribution to atom-surface dispersion forces. Unlike its electrical counterpart, it involves small transition frequencies that are comparable to thermal energy scales. A significant temperature dependence is found near surfaces with a nonzero dc conductivity, leading to a strong suppression of the dispersion force at T > 0. We use thermal response theory for the surface material and discuss both normal metals and superconductors. The asymptotes of the free energy of interaction and of the entropy are calculated analytically over a large range of distances. Near a superconductor, the onset of dissipation at the phase transition strongly changes the interaction, including a discontinuous entropy. We discuss the similarities with the Casimir interaction between two surfaces and suggest that precision measurements of the atom-surface interaction may shed light upon open questions around the temperature dependence of dispersion forces between lossy media.PACS numbers: 03.70.+k -theory of quantized fields; 34.35.+a -interactions of atoms with surfaces; 42.50.Pq -cavity quantum electrodynamics; 42.50.Nn -quantum optical phenomena in conducting media.

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Section: B Distance Dependence Of the Green's Tensorsmentioning

confidence: 99%

“…These losses are a main obstacle for technical applications and further down-scaling of atom chips. Predictions that superconducting materials reduce the spin-flip induced losses significantly have recently been backed by trap lifetime measurements [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the magnetic Casimir-Polder interaction

et al. 2009

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“…consider a normal conducting slab as well as a superconducting slab, as described in Ref. [7]. To the best of our knowledge, this is not done for a general spin or dipole orientation, despite the fact that it in principle has been known for a * Electronic address: per.rekdal@uni-graz.at † Electronic address: boskag@phys.ntnu.no culations.…”

Section: Introductionmentioning

confidence: 99%

Decay processes in the presence of thin superconducting films

Rekdal

Skagerstam

2007

Phys. Rev. A

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In a recent paper [Phys. Rev. Lett. 97, 070401 (2006)] the transition rate of magnetic spin-flip of a neutral two-level atom trapped in the vicinity of a thick superconducting body was studied. In the present paper we will extend these considerations to a situation with an atom at various distances from a dielectric film. Rates for the corresponding electric dipole-flip transition will also be considered. The rates for these atomic flip transitions can be reduced or enhanced, and in some situations they can even be completely suppressed. For a superconducting film or a thin film of a perfect conducting material various analytical expressions are derived that reveals the dependence of the physical parameters at hand.

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“…One demonstrated advantage of superconductors over conventional conductors is the significant reduction of near-field noise in current-carrying structures leading to low atomic heating rates and enhanced spin-flip lifetimes [9][10][11][12][13][14]. Proposals in this area advocate experimental designs for coherent coupling with atomic or molecular quantum systems that exploit the distinct properties of superconductors [15][16][17][18][19][20][21][22].…”

mentioning

confidence: 99%

“…These proposed novel trapping schemes are of particular interest due to the potential low noise provided by the combination of induced magnetization and the reduced near-field noise of the superconducting material [12][13][14]. One possible application is guiding in double structures which is of great interest for integrated atom interferometers.…”

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Programmable trap geometries with superconducting atom chips

et al. 2010

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We employ the hysteretic behavior of a superconducting thin film in the remanent state to generate different traps and flexible magnetic potentials for ultra-cold atoms. The trap geometry can be programmed by externally applied fields. This new approach for atom-optics is demonstrated by three different trap types realized on a single micro-structure: a Z-type trap, a double trap and a bias field free trap. Our studies show that superconductors in the remanent state provide a new versatile platform for atom-optics and applications in ultra-cold quantum gases.PACS numbers: 37.10.Gh, 03.75.Be, 74.78.NaThe use of superconductors in atom chips [1-3] is a recent development, presenting new opportunities for atom optics [4][5][6][7][8]. One demonstrated advantage of superconductors over conventional conductors is the significant reduction of near-field noise in current-carrying structures leading to low atomic heating rates and enhanced spin-flip lifetimes [9][10][11][12][13][14]. Proposals in this area advocate experimental designs for coherent coupling with atomic or molecular quantum systems that exploit the distinct properties of superconductors [15][16][17][18][19][20][21][22].In a previous paper we have demonstrated that the remanent magnetization created by vortices can be used to trap ultra cold atoms without applying a transport current [23]. Other groups have created quadrupole type traps [24] and have shown that vortices modify the trapping potential created by a transport current in a Z-type trap [25]. In this article, we show that the unique response of superconductors to applied magnetic field enables programmable magnetic trap geometries for ultra cold atoms. We demonstrate this new approach by generating three different atom trap geometries on a fixed superconducting micro-structure. We can choose the geometry by applying a suitable external magnetic field sequence. The trapping potentials are generated by spatial magnetic patterns imprinted on a thin film, using the hysteretic response of type-II superconductors.The three different geometries we realize in this article to demonstrate this new approach are shown schematically in Fig.

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Spin Decoherence in Superconducting Atom Chips

Cited by 54 publications

References 34 publications

Temperature dependence of the magnetic Casimir-Polder interaction

Temperature dependence of the magnetic Casimir-Polder interaction

Decay processes in the presence of thin superconducting films

Programmable trap geometries with superconducting atom chips

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