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27 papers · 2 filters
Fast polarimetry system for the application to spin quantum non-demolition measurement
M. Takeuchi, T. Takano, S. Ichihara +4
We report the development of a fast pulse polarimeter for the application to quantum non-demolition measurement of atomic spin (Spin QND). The developed system was tunable to the a…
Paramagnetic Faraday rotation with spin-polarized ytterbium atoms
M. Takeuchi, T. Takano, S. Ichihara +4
We report observation of the paramagnetic Faraday rotation of spin-polarized ytterbium (Yb) atoms. As the atomic samples, we used an atomic beam, released atoms from a magneto-opti…
Decoherence modes of entangled qubits within neutron interferometry
Reinhold A. Bertlmann, Katharina Durstberger, Yuji Hasegawa
We study two different decoherence modes for entangled qubits by considering a Liouville - von Neumann master equation. Mode A is determined by projection operators onto the eigens…
Multimode theory of measurement-induced non-Gaussian operation on wideband squeezed light
M. Sasaki, S. Suzuki
We present a multimode theory of non-Gaussian operation induced by an imperfect on/off-type photon detector on a splitted beam from a wideband squeezed light. The events are define…
Entanglement evaluation of non-Gaussian states generated by photon subtraction from squeezed states
Akira Kitagawa, Masahiro Takeoka, Masahide Sasaki +1
We consider the problem of evaluating the entanglement of non-Gaussian mixed states generated by photon subtraction from entangled squeezed states. The entanglement measures we use…
Squeezing at 946nm with periodically-poled KTiOPO_4
Takao Aoki, Go Takahashi, Akira Furusawa
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…