501 research outputs found
Squeezing at 946nm with periodically-poled KTiOPO_4
We report generation of squeezed vacuum in sideband modes of continuous-wave
light at 946 nm using a periodically poled KTiOPO_4 crystal in an optical
parametric oscillator. At the pump power of 250 mW, we observe the squeezing
level of -5.6+/-0.1 dB and the anti-squeezing level of +12.7+/-0.1 dB. The pump
power dependence of the observed squeezing/anti-squeezing levels agrees with
the theoretically calculated values when the phase fluctuation of locking is
taken into account.Comment: 3 pages, 3 figures, submitted to Optics Letter
Generation of continuous-wave broadband Einstein-Podolsky-Rosen beams using periodically-poled lithium niobate waveguides
Continuous-wave light beams with broadband Einstein-Podolsky-Rosen
correlation (Einstein-Podolsky-Rosen beams) are created with two independent
squeezed vacua generated by two periodically-poled lithium niobate waveguides
and a half beam splitter.Comment: 4 pages, 3 figure
High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables
We experimentally demonstrate continuous-variable quantum teleportation
beyond the no-cloning limit. We teleport a coherent state and achieve the
fidelity of 0.700.02 that surpasses the no-cloning limit of 2/3.
Surpassing the limit is necessary to transfer the nonclassicality of an input
quantum state. By using our high-fidelity teleporter, we demonstrate
entanglement swapping, namely teleportation of quantum entanglement, as an
example of transfer of nonclassicality.Comment: revised version, 4 pages, 4 figure
KANBAYASHI Tsunemichi, KAYA Noriko, and TSUNODA Katsuhisa (eds.), Tradition and Transformation in Aesthetics of East Asian Calligraphy, Tokyo: Sangensha Publishers Inc., 2018 <Book Review>
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