scholarly journals Fabrication of micro-magnetic traps for cold neutral atoms

2003 ◽  
Vol 3 (5) ◽  
pp. 450-464
Author(s):  
B. Lev
Keyword(s):  
Cold Atoms ◽  
Quantum Information Processing ◽  
Clean Room ◽  
Neutral Atoms ◽  
Magnetic Traps ◽  
Precise Control ◽  
Flat Substrate ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Bose Einstein

Many proposals for quantum information processing require precise control over the motion of neutral atoms, as in the manipulation of coherent matter waves or the confinement and localization of individual atoms. Patterns of micron-sized wires, fabricated lithographically on a flat substrate, can conveniently produce large magnetic-field gradients and curvatures to trap cold atoms and to facilitate the production of Bose-Einstein condensates. The intent of this paper is to provide the researcher who has access to a standard clean-room enough information to design and fabricate such devices.

An atom chip for the manipulation of ultracold atoms

2009 ◽  
Vol 87 (6) ◽  
pp. 633-638 ◽  
Author(s):  
O. Cherry ◽  
J. D. Carter ◽  
J. D.D. Martin
Keyword(s):  
Magnetic Field ◽  
Ultracold Atoms ◽  
Cold Atoms ◽  
Atom Chip ◽  
Adhesion Layer ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Lift Off ◽  
20 Nm ◽  
Si Wafer

We have fabricated an atom chip that magnetically traps laser cooled 87Rb by generating high magnetic-field gradients using micrometre scale current-carrying wires. The wires are fabricated on a Si wafer (with a 40 nm SiO2 layer) using 1.2 μm thick Au and a 20 nm thick adhesion layer, and are patterned with lift-off photolithography. We characterize the number and temperature of the cold atoms trapped by the chip.

Nuclear magnetic resonance microscopy

1989 ◽  
Vol 47 ◽  
pp. 828-829
Author(s):  
Paul C. Lauterbur
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Signal To Noise ◽  
Field Gradients ◽  
Useful Signal ◽  
Magnetic Field Gradients ◽  
Observation Times ◽  
Nuclear Magnetic

Nuclear magnetic resonance imaging can reach microscopic resolution, as was noted many years ago, but the first serious attempt to explore the limits of the possibilities was made by Hedges. Resolution is ultimately limited under most circumstances by the signal-to-noise ratio, which is greater for small radio receiver coils, high magnetic fields and long observation times. The strongest signals in biological applications are obtained from water protons; for the usual magnetic fields used in NMR experiments (2-14 tesla), receiver coils of one to several millimeters in diameter, and observation times of a number of minutes, the volume resolution will be limited to a few hundred or thousand cubic micrometers. The proportions of voxels may be freely chosen within wide limits by varying the details of the imaging procedure. For isotropic resolution, therefore, objects of the order of (10μm) may be distinguished.Because the spatial coordinates are encoded by magnetic field gradients, the NMR resonance frequency differences, which determine the potential spatial resolution, may be made very large. As noted above, however, the corresponding volumes may become too small to give useful signal-to-noise ratios. In the presence of magnetic field gradients there will also be a loss of signal strength and resolution because molecular diffusion causes the coherence of the NMR signal to decay more rapidly than it otherwise would. This phenomenon is especially important in microscopic imaging.

scholarly journals Coherent electron displacement for quantum information processing using attosecond single cycle pulses

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hicham Agueny
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Coherent Motion ◽  
Superposition State ◽  
Phase Information ◽  
Quantum Superposition ◽  
Single Cycle ◽  
Precise Control ◽  
Advanced Control ◽  
A Chain

AbstractCoherent electron displacement is a conventional strategy for processing quantum information, as it enables to interconnect distinct sites in a network of atoms. The efficiency of the processing relies on the precise control of the mechanism, which has yet to be established. Here, we theoretically demonstrate a new route to drive the electron displacement on a timescale faster than that of the dynamical distortion of the electron wavepacket by utilizing attosecond single-cycle pulses. The characteristic feature of these pulses relies on a vast momentum transfer to an electron, leading to its displacement following a unidirectional path. The scenario is illustrated by revealing the spatiotemporal nature of the displaced wavepacket encoding a quantum superposition state. We map out the associated phase information and retrieve it over long distances from the origin. Moreover, we show that a sequence of such pulses applied to a chain of ions enables attosecond control of the directionality of the coherent motion of the electron wavepacket back and forth between the neighbouring sites. An extension to a two-electron spin state demonstrates the versatility of the use of these pulses. Our findings establish a promising route for advanced control of quantum states using attosecond single-cycle pulses, which pave the way towards ultrafast processing of quantum information as well as imaging.

PFG NMR and internal magnetic field gradients in plant-based materials

2002 ◽  
Vol 20 (7) ◽  
pp. 567-573 ◽  
Author(s):  
Nikolaus Nestle ◽  
Asal Qadan ◽  
Petrik Galvosas ◽  
Wolfgang Süss ◽  
Jörg Kärger
Keyword(s):  
Magnetic Field ◽  
Internal Magnetic Field ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Pfg Nmr

Arrays of microscopic magnetic traps for cold atoms and their applications in atom optics

2002 ◽  
Vol 11 (5) ◽  
pp. 472-480 ◽  
Author(s):  
Yin Jian-Ping ◽  
Gao Wei-Jian ◽  
Hu Jian-Jun
Keyword(s):  
Cold Atoms ◽  
Atom Optics ◽  
Magnetic Traps
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