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santecarloni

Tilting 'nanocups' double optical frequencies - physicsworld.com - 0 views

physicsworld.com/...47972

phy technology

shared by santecarloni on 29 Nov 11 - No Cached
  • santecarloni on 29 Nov 11
     
    A new type of structure for converting red light into blue has been unveiled by researchers in the US. Known as frequency doubling or second-harmonic generation (SHG), the conversion involves "nanocups", which are tiny, artificially designed 3D structures. SHG is used in light sources and in metrology applications - and the researchers believe that the new structures could be adapted to achieve frequency doubling in parts of the electromagnetic spectrum where it is currently not possible.
pacome delva

Physics - Atoms in a lattice keep time - 0 views

physics.aps.org/...PhysRevLett.103.063001

phy metrology atomic_clocks atom_interferometry

shared by pacome delva on 05 Aug 09 - Cached
  • If your wristwatch was as accurate as today’s atomic clocks, it would not gain or lose a second in 80 million years.
  • The NIST group traps and cools neutral 171Yb atoms and loads them into a one-dimensional lattice, so that about 30,000 atoms fill several hundred lattice sites.
  • Lemke et al. compare their optical lattice clock with the current standard atomic fountain clock and find that the accuracy of the Yb lattice clock potentially challenges the current standard.
jcunha

Kilogram conflict resolved at last - 3 views

www.nature.com/...flict-resolved-at-last-1.18550

technology science metrology

shared by jcunha on 15 Oct 15 - No Cached
  • jcunha on 15 Oct 15
     
    Apparently it's time for retirement of the Le Grand K, if all goes well until the middle of next year...
  • Ma Ru on 16 Oct 15
     
    "One method (...) involves counting the atoms in two silicon-28 spheres that each weigh the same as the reference kilogram." Sounds like a lengthy task, but someone must keep those physics PhD students busy, I guess...
jaihobah

Europe Unveils Its Vision for a Quantum Future - 0 views

www.technologyreview.com/...ts-vision-for-a-quantum-future

PHY INF NAN QM Computing Metrology Sensing

shared by jaihobah on 20 Dec 17 - No Cached
  • jaihobah on 20 Dec 17
     
    "...the European Commission announced in 2016 that it was investing one billion euros in a research effort known as the Quantum Technology Flagship. The goal for this project is to develop four technologies: quantum communication, quantum simulation, quantum computing, and quantum sensing. After almost two years, how is it going?" arxiv link to the actual report: http://arxiv.org/abs/1712.03773
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