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- M. Kozuma, L. Deng, E. W. Hagley, J. Wen, R. Lutwak, K. Helmerson +2 others
- 1999

We have observed Bragg diffraction of a Bose-Einstein condensate of sodium atoms by a moving, periodic, optical potential. The coherent process of Bragg diffraction produced a splitting of the condensate with unidirectional momentum transfer. Using the momentum selectivity of the Bragg process, we separated a condensate component with a momentum width… (More)

- M. Kozuma
- 2006

Various atom-photon entangled states can be generated by utilizing corresponding conservation law. In particular, higher-dimensional entanglement between an atomic ensemble and a photon is expected to arise from angular momentum conservation law. Here we demonstrate entanglement of or-bital angular momentum states by utilizing atomic collective excitation… (More)

We construct a Mach-Zehnder interferometer using Bose-Einstein condensed rubidium atoms and optical Bragg diffraction. In contrast to interferometers based on normal diffraction, where only a small percentage of the atoms contribute to the signal, our Bragg diffraction interferometer uses all the condensate atoms. The condensate coherence properties and… (More)

We report the generation of a continuous-wave squeezed vacuum resonant on the Rb D1 line (795 nm) using periodically poled KTiOPO4 (PPKTP) crystals. With a frequency doubler and an optical parametric oscillator based on PPKTP crystals, we observed a squeezing level of -2.75+/-0.14 dB and an antisqueezing level of +7.00+/-0.13 dB. This system could be… (More)

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