1. Findlay Brown - Emeralds


    from Marie Mamonia Added 81 0 0

    Findlay Brown - Emeralds

    + More details
    • Momento Solo


      from John Coombes Added

      A dancer arrives early at the studio. She has the place to herself. She is alone for a brief moment, just her, her thoughts and her dreams. dancer: Irma Carpino camera assistant: Stefano Critelli editor: Nigel Lodge director/camera operator: John Coombes music: Slowlight by Moby, with thanks to MobyGratis take 3

      + More details
      • The Sun & The Moon by Thee Slowlight group.


        from Nick Evans Added 538 0 0

        Katia and I have a kind of open group, SLOWLIGHT whoever's visiting us in the Molino in Asturias or practising Yoga in Mysore can pick up an instrument and join in. We recoded some songs in Wales with Iwan Morgan and this was the first to come out sounding OK. We play in local cultural centres, churches, beaches, weddings, and in our Yoga school. The songs are a psychedelic devotional with influences ranging from the Incredible String band to Crass stopping at Bonnie Prince Billy, Beach House and Current 93 along the way (although it sounds like none of the above really). I like the idea that we all reflect one another's light, and the moon is of course the sun's first reflection. I dedicate the song to my dearly departed father Colin Huw Evans and my beloved Yoga master Sri K. Pattabhi Jois R.I.P. The video was made with the guiding hand of Tiago Machado and myself. Thanks for listening and watching.

        + More details
        • Slow Light - Mikio Kozuma, Tokyo Institute of Technology


          from Kavli Frontiers of Science Added 161 0 0

          Slow Light Mikio Kozuma, Tokyo Institute of Technology 1. Introduction While lights are the fastest and the most robust carriers of information, it is difficult to localize and store them. Recently, a novel scheme to store the photonic information in an atomic ensemble was proposed [1], which is based on the phenomenon of ultraslow light propagation [2]. Ultraslow light propagation is made possible by electromagnetically induced transparency (EIT) [3], which is a technique for turning an opaque medium for a weak probe light into a transparent one with the help of anadditional control light. There is a steep dispersion within the transparency window, so that the speed of the probe light pulse is significantly reduced in the EIT medium. Eventually the probe pulse is completely localized in the atomic medium. Cutting off the control light enables us to map the photonic information on the atomic spin information. 2. How to realize quantum memory Proof-of-principle experiments were simultaneously performed by two groups [4,5], where a weak laser pulse was stored in an atomic ensemble and after a while the light pulse whose temporal waveform was similar to the original one was retrieved. These great demonstrations triggered the research to realize the quantum memory. In order to demonstrate the quantum memory, what kind of thing should we perform? Classical electromagnetism says the light is an oscillating electromagnetic field and itis thus represented as a dot in a plane where the transverse and the longitudinal axes are sinω t and cosω t , respectively. However, quantum mechanics says these two components behave as a position and a momentum of a particle, which means the light can not be represented as a dot due to the uncertainty principle. In other words, quantum property of the light field exists in its fluctuation. In order to demonstrate quantum memory, we have to store such a quantum fluctuation of the light field in the atomic medium. 3. Our experimental challenge The uncertainty principle allows us to generate very special light field, i.e., the squeezed vacuum state, where the fluctuation of X is squeezed and that of P is enhanced. Since the squeezed vacuum is the field whose quantum fluctuation is manipulated, storing such a state should be the best demonstration of the quantum memory. EIT was successfully observed for the squeezed vacuum state [6] and very recently ultraslow propagation of the squeezed vacuum was also realized [7,8]. Now the final success is very close. References [1] “Quantum memory for photons: Dark-state polaritons”, M. Fleischhauer and M. D. Lukin, Physical Review A 65, 022314 (2002). [2] “Light speed reduction to 17 meters per second in an ultracold atomic gas”, L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, Nature 397, 594 (1999). [3] “Electromagnetically induced transparency”, S. E. Harris, Physics Today 50, 36 (1997). [4] “Observation of coherent optical information storage in an atomic medium using halted light pulses”, C. Liu, Z. Dutton, C. H. Behroozi, and L .V. Hau, Nature 409, 490 (2001). [5] “Storage of light in atomic vapor”, D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, Physical Review Letters 86, 783 (2001). [6] “Electromagnetically induced transparency with squeezed vacuum”, D. Akamatsu, K. Akiba, and M. Kozuma, Physical Review Letters 92, 203602 (2004). [7] “Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4”, T. Tanimura, D. Akamatsu, Y. Yokoi, A. Furusawa and M. Kozuma, Optics Letters 31, 2344 (2006). [8] “Ultraslow propagation of a squeezed vacuum with electromagnetically induced transparency”, D. Akamatsu, Y. Yokoi, T. Tanimura, A. Furusawa, and M. Kozuma, arXiv.org e-print archive, quant-ph/0611097.

          + More details
          • Slow Light - Lene Vestergaard Hau, Harvard University


            from Kavli Frontiers of Science Added 418 5 0

            Ultra-slow light in Bose-Einstein condensates: Shocking matter and transforming light. Lene Vestergaard Hau Lyman Laboratory, Harvard University www.deas.harvard.edu/haulab Light pulses have been slowed in a Bose-Einstein condensate to only 17 m/s, more than seven orders of magnitude lower than the light speed in vacuum. Associated with the dramatic reduction factor for the light speed is a spatial compression of the pulses by the same large factor. A light pulse, which is 1-2 miles long in vacuum, is compressed to a size of ~50 microns, and at that point it is completely contained within the atom cloud. This further allows the light pulse to be completely stopped and stored in the atomic medium for up to several milliseconds, and subsequently regenerated with no loss. With the most recent extension of the method, the light roadblock, light pulses have been compressed from 2 miles to only 1-2 microns. The system has been used to generate Quantum Shock Waves in Bose-Einstein condensates. These dramatic excitations result in the formation of solitons and quantized vortices: the superfluid analogue of tornadoes. The vortices are created far out of equilibrium, in pairs of opposite circulation, and the observations reveal directly the process of superfluid breakdown.

            + More details
            • Slow Light - Toshihiro Nakanishi, Kyoto University


              from Kavli Frontiers of Science Added 82 0 1

              Slow Light Toshihiro Nakanishi, Kyoto University Owing to recent development of experimental techniques in quantum electronics, it has been possible to change the speed of light dramatically in a medium. The speed of light, which is c=300,000km/m in a vacuum, can be reduced to less than the speed of car. Moreover, one can momentarily stop the light pulse in the medium. The process conserves not only the shape of the pulse, but also the quantum property of the light. The slow light and stopped light has been attracting attentions from many researchers, because they have a lot of applications such as storage of non-classical light, extremely large nonlinearity, and so on. Before the discussion of the slow light, we have to clarify the definition of the speed. Group velocity is appropriate to represent the propagation speed of wavepackets, because it describes the propagation speed of the pulse envelope. The group velocity in a medium depends on the refractive index nand its frequency derivative dn/dω. In the medium whose refractive index decreases rapidly with respect to the frequency, the group velocity becomes larger than c. (Some textbooks describe that superluminal group velocity is forbidden, but it is not true.) If the refractive index increases rapidly with the frequency, the group velocity becomes extremely small. Hence, we have to manage the profile of the refractive index in order to control the group velocity. Extremely small group velocity can be realized by utilizing electromagnetically induced transparency (EIT), which is a method to nullify absorption of a probe laser using an auxiliary laser called a control laser. The disappearance of the absorption takes place in a narrow frequency region called an EIT window. The refractive index is closely related to the absorption, so the refractive index as well as the absorption varies significantly in the EIT window. When the spectrum of the light pulse is restricted in the EIT windows, the pulse travels at extremely small group velocity without any absorption. Professor Hau and her co-workers successfully reduced the group velocity to 17m/s in a laser-cooled atomic gas in 1999. The group velocity in the EIT medium is a function of the intensity of the control laser, and it is possible to stop the light pulse in the EIT medium by turning the control laser off during the slow propagation. The control laser is turned on again, the stopped light starts to run. In 2001, two groups succeeded to demonstrate the storage of laser light, which does not have quantum property. The storage of non-classical light has been one of challenging topics, which are essential for the development of quantum information technologies. In the presentation, we introduce the definitions of light speed, and review some interesting issues that cover the superluminal propagation, slow light propagation, and stopped light.

              + More details
              • Happy Birthday!


                from Luk Simoens Added 170 3 0

                A birthday never to forget . A big thank you to Moby for letting me use his wonderful music.

                + More details
                • Slowlight -Copper Mirrors


                  from Starchild & The New Romantic Added 2,578 50 5


                  + More details

                  What are Tags?


                  Tags are keywords that describe videos. For example, a video of your Hawaiian vacation might be tagged with "Hawaii," "beach," "surfing," and "sunburn."