Towards a guided atom interferometer based on a superconducting atom chip

Müller, Tobias M.; Wu, Xihu; Mohan, Anand; Eyvazov, A; Wu, Yuping; Dumke, Rainer

doi:10.1088/1367-2630/10/7/073006

Cited by 16 publications

(19 citation statements)

References 41 publications

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“…It is known that, usually, the sheet critical current density of YBCO films is not proportional to their thickness. At 77 K for d f ~300 nm the typical sheet critical value is 1.110 4 A/m; for d f = 600÷800 nm, J c = (1.2÷2.1)10 4 A/m [ 29,56]. Respectively, ch B equals to 140 G or is in the range 150÷260 G. In some experiments the superconductor temperature was higher, 83 K [ 28,29], and the sheet critical current density decreased to 0.410 4 A/m for d f = 300 nm.…”

Section: Discussionmentioning

confidence: 99%

“…[ 51,52,53]. In atom trap experiments, the niobium (Nb) [ 14,15,19,27,54,55], magnesium diboride (MgB 2 ) [ 25,26], and high-temperature YBCO [ 28,29,56] films have been employed.The critical temperature of Nb films is about 9.5 K; usually, their thickness is within the range 400÷900 nm and the chip operation temperature is 4-6 K [ 14, 15, 19, 27, 54, 55]. Under such conditions the critical sheet current density c J of Nb films is in the range (1.6÷3.6)10 4 A/m.…”

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confidence: 99%

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3D modeling of magnetic atom traps on type-II superconductor chips

Prigozhin

Barrett

2014

Supercond. Sci. Technol.

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Magnetic traps for cold atoms have become a powerful tool of cold atom physics and condense matter research. The traps on superconducting chips allow one to increase the trapped atom life-and coherence time by decreasing the thermal noise by several orders of magnitude compared to that of the typical normal-metal conductors. A thin superconducting film in the mixed state is, usually, the main element of such a chip.Using a finite element method to analyze thin film magnetization and transport current in type-II superconductivity, we study magnetic traps recently employed in experiments. The proposed approach allows us to predict important characteristics of the magnetic traps (their depth, shape, distance from the chip surface, etc.) necessary when designing magnetic traps in cold atom experiments.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

3D modeling of magnetic atom traps on type-II superconductor chips

Prigozhin

Barrett

2014

Supercond. Sci. Technol.

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“…In the area of magnetic trapping of ultracold atoms, considerable attention has been recently devoted to the interaction of atomic clouds with the surfaces of both superconducting atom chips [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and superconducting solid state devices [17][18][19][20]. Technological advances will allow a new generation of fundamental experiments and applications involving the control of the interface between atomic systems and quantum solid state devices.…”

Section: Introductionmentioning

confidence: 99%

“…This can be achieved by coating the chip surface with a reflective metal film. The metal film can also protect the superconductor when it is operated near the critical current density, to avoid possible * Electronic address: Fermani@ntu.edu.sg † Permanent address: Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Road, Glassboro, New Jersey, USA quenching [7]. However, the presence of the metal film above the superconducting layer may increase the near field noise significantly.…”

Section: Introductionmentioning

confidence: 99%

Heating rate and spin flip lifetime due to near-field noise in layered superconducting atom chips

Fermani

Müller

Zhang

et al. 2010

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

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We theoretically investigate the heating rate and spin flip lifetimes due to near field noise for atoms trapped close to layered superconducting structures with the superconductor in the Meissner state. In particular, we compare the case of a gold layer deposited above a superconductor with the case of a bare superconductor. We study a niobium-based and a YBa2Cu3O7−x (YBCO)-based chip. For both niobium and YBCO chips at a temperature of 4.2 K, we find that the deposition of the gold layer can have a significant impact on the heating rate and spin flip lifetime, as a result of the increase of the near field noise. At a chip temperature of 77 K, this effect is less pronounced for the YBCO chip.

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“…Similar film deposition methods as in [5] are used for the fabrication of the high-T c chip described in [6]. A 600-800-nm film of YBCO is grown by epitaxy on a yttria-stabilized zirconia (YSZ) single-crystal substrate in order to match the lattice parameters.…”

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confidence: 99%

Cryogenic Atom Chips

et al. 2011

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It is quite remarkable to observe that in 1995, when Weinstein and Libbrecht wrote their seminal article on microscopic atomic traps [1], the very same research group published experimental results on long-lived neutral atom traps in a cryogenic environment [2]. They reported trapping lifetimes of nearly 10 minutes for magnetostatic traps created by centimeter-size superconducting coils. Moreover they claimed that "with a cryogenic system one can use superconducting magnets and SQUID detectors to trap and non-destructively sense spin-polarized atoms". This sentence foresees some of the possibilities of cryogenic atom chips using superconducting materials. Low temperatures and superconductivity do not only offer ultrahigh vacuum conditions and high currents without dissipation. They also open the way to a new class of experiments where ultra-cold atoms will be integrated on a chip together with solid-state devices whose coherent manipulation is only possible at low temperatures. A good example of such a device is a Superconducting Quantum Interference Device (SQUID) coupled to the magnetic moment of the trapped atomic cloud [3]. Other interesting candidates like coplanar waveguide resonators or the nano-electro-mechanical system (NEMS) are also worth mentioning.It took some time after the initial proposal of [1] to develop and operate the first atom chips (see Chapter 1) at room temperature and an even longer time to operate them in cryogenic conditions. The first results on superconducting atom chips were reported at ENS Paris in 2006 [4] and at NTT Basic research labs in 2007 [5]. Many groups in the world are now building experiments along this line of research and exciting developments are expected. The first part of this chapter (Section 10.2) will present a review of the existing experiments on cryogenic chips. We will try to show by which aspects they may be similar to or differ from equivalent roomtemperature setups. In Section 10.3 we will give a few examples of new experiments that could be carried out with cryogenic chips. Atom Chips. Edited by Jakob Reichel and Vladan Vuletić

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Towards a guided atom interferometer based on a superconducting atom chip

Cited by 16 publications

References 41 publications

3D modeling of magnetic atom traps on type-II superconductor chips

3D modeling of magnetic atom traps on type-II superconductor chips

Heating rate and spin flip lifetime due to near-field noise in layered superconducting atom chips

Cryogenic Atom Chips

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