| 1. |
- Kruger, Peter, et al.
(författare)
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Coherent matter wave optics on an atom chip
- 2006
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Ingår i: Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference CLEO/QELS 2006 Conference on. ; , s. 1-2
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Konferensbidrag (refereegranskat)abstract
- Coherent manipulation of matter waves in microscopic trapping potentials facilitates both fundamental and technological applications. Here we focus on experiments with a microscopic integrated interferometer that demonstrate coherent operation on an atom chip.
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| 2. |
- Krüger, Peter, et al.
(författare)
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Cold atoms close to surfaces: measuring magnetic field roughness and disorder potentials
- 2005
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Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 19:1, s. 56-65
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Tidskriftsartikel (refereegranskat)abstract
- Microscopic atom optical devices integrated on atom chips allow to precisely control and manipulate ultra-cold ( T < 1 µK) neutral atoms and Bose-Einstein condensates (BECs) close to surfaces. The relevant energy scale of a BEC is extremely small (down to < 10 −11 eV). Consequently, BECs can be utilized as a sensor for variations of the potential energy of the atoms close to the surface. Here we describe how to use trapped atoms as a measurement device and analyze the performance and flexibility of the field sensor. We demonstrate microscopic magnetic imaging with simultaneous high spatial resolution (3 µm) and high field sensitivity (4 nT). With one dimensional BECs, we probe the magnetic field variations close to the surface at distances down to a few microns. Measurements of the magnetic field of a 100 µm wide current carrying wire imply that the magnetic field variations stem from residual variations of the current flow direction, resulting from local properties of the wire. These disorder potentials found near lithographically fabricated wires are two orders of magnitude smaller than those measured close to electroplated conductors.
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| 3. |
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| 4. |
- Wilzbach, Marco, et al.
(författare)
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Detecting neutral atoms on an atom chip
- 2006
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Ingår i: Fortschritte der Physik. - : Wiley-VCH Verlagsgesellschaft. - 0015-8208 .- 1521-3978. ; 54:8-10, s. 746-764
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Tidskriftsartikel (refereegranskat)abstract
- Detecting single atoms (qubits) is a key requirement for implementing quantum information processing on an atom chip. The detector should ideally be integrated on the chip. Here we present and compare different methods capable of detecting neutral atoms on an atom chip. After a short introduction to fluorescence and absorption detection we discuss cavity enhanced detection of single atoms. In particular we concentrate on optical fiber based detectors such as fiber cavities and tapered fiber dipole traps. We discuss the various constraints in building such detectors in detail along with the current implementations on atom chips. Results from experimental tests of fiber integration are also described. In addition we present a pilot experiment for atom detection using a concentric cavity to verify the required scaling.
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| 5. |
- Wilzbach, Marco, et al.
(författare)
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Simple integrated single-atom detector
- 2009
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Ingår i: Optics Letters. - : Optical Society of America. - 0146-9592 .- 1539-4794. ; 34:3, s. 259-261
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Tidskriftsartikel (refereegranskat)abstract
- We present a reliable and robust integrated fluorescence detector capable of detecting single atoms. The detector consists of a tapered lensed single-mode fiber for precise delivery of excitation light and a multimode fiber to collect the fluorescence. Both are mounted in lithographically defined SU-8 holding structures on an atom chip. Rb-87 atoms propagating freely in a magnetic guide are detected with an efficiency of up to 66%, and a signal-to-noise ratio in excess of 100 is obtained for short integration times.
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