197 research outputs found
WETTABILITY OF PCB SURFACE FINISHES
Tato bakalářská práce se zabývá měřením smáčecích charakteristik pomocí metody smáčecích vah u vzorků různých povrchových úprav od firmy Gatema. Věnuje se vlivu izotermálního stárnutí a přetavovacích procesů na smáčecí charakteristiky povrchových úprav ENIG, bezolovnatý HAL a imerzní cín. U povrchové úpravy imerzním cínem je sledován vliv intermetalické vrstvy na celkovou smáčivost. Dále se zabývá smáčivostí vrstvy niklu, po odstripování zlata, u povrchové úpravy ENIG.This bachelor’s thesis with measuring of wetting characteristics by the wetting balance method for samples of different surface finishes from the firm Gatema. It deals with influence of the isothermal aging and reflow processes on wetting characteristics of surface finishes ENIG, HAL and immersion tin. The influence of intermetallic layer on the overall wettability is studied in case of the surface finish of immersion tin. Also deals with the wettability of the nickel layer, after stripped off gold, in case of the surface finish of ENIG.
Welding analysis of turbine rotor
Rešeršní bakalářská práce analyzuje možnosti svařování rotorů parních turbín s důrazem na efektivnost, produktivitu a ekonomičnost svarového postupu. Práce hodnotí možný výskyt defektů ve svarovém spoji a snahu jim předejít. Na základě literárních zdrojů je uvedena charakteristika materiálů turbín odolávajícím vysokým provozním teplotám. Svařovaný koncept rotoru je vyzdvihnut, protože má řadu výhod při užití u velkých parních turbín pro energetiku.A research bachelor thesis analyzes possibilities of welding on turbine rotors with emphasis on efficiency, productivity and economy of welding procedure. The work evaluates presence of failures in weld joint and effort to prevent them. Characteristics of turbine materials, which resist to high service temperatures are presented on the literature sources basis. Concept of welded turbine rotor is preferred, because it has many advantages in using big steam turbines for power industry.
Analysis of a proposal for a realistic loophole-free Bell test with atom-light entanglement
The violation of Bell inequalities where both detection and locality
loopholes are closed is crucial for device independent assessments of quantum
information. While of technological nature, the simultaneous closing of both
loopholes still remains a challenge. In Nat. Commun. 4:2104(2013), a realistic
setup to produce an atom-photon entangled state that could reach a loophole
free Bell inequality violation within current experimental technology was
proposed. Here we improve the analysis of this proposal by giving an analytical
treatment that shows that the state proposed in Nat. Commun. 4:2104(2013) could
in principle violate a Bell inequality for arbitrarily low photodetection
efficiency. Moreover, it is also able to violate a Bell inequality considering
only atomic and homodyne measurements eliminating the need to consider
inefficient photocounting measurements. In this case, the maximum
Clauser-Horne-Shimony-Holt (CHSH) inequality violation achievable is 2.29, and
the minimum transmission required for violation is about 68%. Finally, we show
that by postselecting on an atomic measurement, one can engineer superpositions
of coherent states for various coherent state amplitudes.Comment: 7 pages, 6 figures, to appear in Phys. Rev.
Quantum repeaters based on heralded qubit amplifiers
We present a quantum repeater scheme based on the recently proposed qubit
amplifier [N. Gisin, S. Pironio and N. Sangouard, Phys. Rev. Lett. 105, 070501
(2010)]. It relies on a on-demand entangled-photon pair source which uses
on-demand single-photon sources, linear optical elements and atomic ensembles.
Interestingly, the imperfections affecting the states created from this source,
caused e.g. by detectors with non-unit efficiencies, are systematically
purified from an entanglement swapping operation based on a two-photon
detection. This allows the distribution of entanglement over very long
distances with a high fidelity, i.e. without vacuum components and multiphoton
errors. Therefore, the resulting quantum repeater architecture does not
necessitate final postselections and thus achieves high entanglement
distribution rates. This also provides unique opportunities for
device-independent quantum key distribution over long distances with linear
optics and atomic ensembles.Comment: 8 pages, 4 figure
Approaches for a quantum memory at telecommunication wavelengths
We report experimental storage and retrieval of weak coherent states of light
at telecommunication wavelengths using erbium ions doped into a solid. We use
two photon echo based quantum storage protocols. The first one is based on
controlled reversible inhomogeneous broadening (CRIB). It allows the retrieval
of the light on demand by controlling the collective atomic coherence with an
external electric field, via the linear Stark effect. We study how atoms in the
excited state affect the signal to noise ratio of the CRIB memory. Additionally
we show how CRIB can be used to modify the temporal width of the retrieved
light pulse. The second protocol is based on atomic frequency combs (AFC).
Using this protocol we also verify that the reversible mapping is phase
preserving by performing an interference experiment with a local oscillator.
These measurements are enabling steps towards solid state quantum memories at
telecommunication wavelengths. We also give an outlook on possible
improvements.Comment: 13 pages, 11 figure
Spin Wave Storage using Chirped Control Fields in Atomic Frequency Comb based Quantum Memory
It has been shown that an inhomogeneously broadened optical transition shaped
into an atomic frequency comb can store a large number of temporal modes of the
electromagnetic field at the single photon level without the need to increase
the optical depth of the storage material. The readout of light modes is made
efficient thanks to the rephasing of the optical-wavelength coherence similarly
to photon echo-type techniques and the re-emission time is given by the comb
structure. For on-demand readout and long storage times, two control fields are
used to transfer back and forth the optical coherence into a spin wave. Here,
we present a detailed analysis of the spin wave storage based on chirped
adiabatic control fields. In particular, we verify that chirped fields require
significantly weaker intensities than -pulses. The price to pay is a
reduction of the multimode storage capacity that we quantify for realistic
material parameters associated with solids doped with rare-earth-metal ions.Comment: 7 pages, 3 figure
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