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European Commission - EIT - 0 views

ec.europa.eu/index_en.htm technology EU eit research institute innovation
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    ACT is a bit too late for leadership on European Technology, but this looks like a science version of ESA - so this could be interesting for us to have an eye on it.
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http://eit.europa.eu/fileadmin/Content/Downloads/PDF/Official_documents/eit_Draft_Trien... - 5 views

eit.europa.eu/...l_Work_Programme_2010-2012.pdf innovation
shared by LeopoldS on 08 Jan 10 - No Cached
  • LeopoldS on 08 Jan 10
     
    have a look at this .... cooperation? becoming a centre?
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Light brought to a complete stop - 3 views

www.natureworldnews.com/...t-complete-stop-one-minute.htm science light
shared by Thijs Versloot on 29 Jul 13 - No Cached
  • Thijs Versloot on 29 Jul 13
     
    "When a control laser is fired at the crystal, a complex quantum-level reaction turns it the opaque crystal transparent. A second light source is beamed into the crystal before the control laser is shut off, returning the crystal to its opaque state. This leaves the light trapped inside the crystal, and the opacity of the crystal keeps the light trapped inside from bouncing around, effectively bringing light to a full stop." is the simple explanation, but I am not sure how this is actually possible with the current laws of physics
  • Isabelle Dicaire on 05 Aug 13
     
    There are two ways to make slow light: material slow light and structural slow light, where you either change the material or the structural properties of your system. Here they used eit to make material slow light, by inducing transparency inside an otherwise opaque material. As you change the absorption properties of a material you also change its dispersion properties, the so-called Kramers-Kronig relations. A rapid positive change in the dispersion properties of a material will give rise to slow light. To effectively stop light they switched off the control beam, bringing back the opaque state. Another control beam is then used to retrieve the probe pulse that was 'frozen' inside the medium. Light will be halted according to the population lifetime on the energy level (~ 100s). They used an evolutionary algorithm to find an optimal pulse preparation sequence to reach close to the maximum possible storage duration of 100s. Interesting paper!
  • Thijs Versloot on 06 Aug 13
     
    So it is not real storage then in a sense, as you are stimulating an excitation population which retains the phase information of your original pulse? Still it is amazing that they could store this up to 100s and retrieve it with a probe pulse, but light has never been halted.
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Slowed light breaks record - 0 views

physicsworld.com/...41246 phy slow_light quantum_computation quantum_cryptography BEC
shared by pacome delva on 16 Dec 09 - Cached
  • Kilometre-long pulses of light have been stored for over one second in a 0.1 mm cloud of ultracold atoms – before being revived and sent on their way. This latest demonstration of light storage using electromagnetically induced transparency (EIT) is the first to break the second barrier – using ultracold atoms and has the added bonus of preserving the quantum state of the incoming pulse. The physicists in the US who carried out the experiment say that the work could play a key role in quantum information technology.
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