A three-photon W state was generated with 30 times higher efficiency and 10 times lower pump power than a previous work by utilizing weak coherent light. The scheme can be naturally extended to higher order.
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(纸本)1557527709
A three-photon W state was generated with 30 times higher efficiency and 10 times lower pump power than a previous work by utilizing weak coherent light. The scheme can be naturally extended to higher order.
We study the measurement-induced non-Gaussian operation on the single- and two-mode Gaussian squeezed vacuum states with beam splitters and on-off type photon detectors, with which mixed non-Gaussian states are genera...
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We study the measurement-induced non-Gaussian operation on the single- and two-mode Gaussian squeezed vacuum states with beam splitters and on-off type photon detectors, with which mixed non-Gaussian states are generally obtained in the conditional process. It is known that the entanglement can be enhanced via this non-Gaussian operation on the two-mode squeezed vacuum state. We show that, in the range of practical squeezing parameters, the conditional outputs are still close to Gaussian states, but their second order variances of quantum fluctuations and correlations are effectively suppressed and enhanced, respectively. To investigate an operational meaning of these states, especially entangled states, we also evaluate the quantum dense coding scheme from the viewpoint of the mutual information, and we show that non-Gaussian entangled state can be advantageous compared with the original two-mode squeezed state.
The drying process of thin films of polymer solutions or colloidal suspensions with a pinned contact line is investigated theoretically. The time evolution of the surface shape is calculated by taking into account of ...
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The drying process of thin films of polymer solutions or colloidal suspensions with a pinned contact line is investigated theoretically. The time evolution of the surface shape is calculated by taking into account of the solvent evaporation, the internal flow driven by surface tension, and the gelation (or solidification) of the fluid. It is shown that the final shape of the solidified film changes from dot-type to ring-type as the initial concentration of solute increases, or the evaporation rate decreases, but this is due to a rather intricate balance of the change of the solvent evaporation rate and the change of viscosity.
Particles within plasma etching equipment stick to the wafer and cause defects, resulting in large scale integrated circuit (LSI) yield reduction. We observed the behavior of particles resuspended in a vacuum chamber ...
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In this paper, the quantum interference of a mode-locked two-photon state, which is a new phenomenon that has recently been experimentally observed, is analyzed. We show some interference fringes that will be observed...
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In this paper, the quantum interference of a mode-locked two-photon state, which is a new phenomenon that has recently been experimentally observed, is analyzed. We show some interference fringes that will be observed in an unbalanced Mach-Zehnder interferometer.
We propose two interesting methods of generating the four-photon W state. These methods use parametric down-conversion processes, linear optical elements, and commercial photon detectors, which are readily feasible un...
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We propose two interesting methods of generating the four-photon W state. These methods use parametric down-conversion processes, linear optical elements, and commercial photon detectors, which are readily feasible under current technology. They can also be used to generate the three-photon W state, the three-photon Greenberger-Horne-Zeilinger state, and the three-photon maximally entangled photon-number state (a typical photon-number entanglement state) by simply changing some experimental components or their parameters. Moreover, assuming we have photon number-resolving detectors, these methods can develop into methods that generate a general n-photon W state. They are expected to become powerful tools for experimental investigations of multipartite entanglement and its applications to quantum information processing.
An experimental scheme for producing a four-photon entangled W state directly from the parametric down-conversion of a two-crystal geometry is proposed. In our scheme, only linear optical elements and photon detectors...
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An experimental scheme for producing a four-photon entangled W state directly from the parametric down-conversion of a two-crystal geometry is proposed. In our scheme, only linear optical elements and photon detectors are required. Sophisticated and fragile interferometric setups are unnecessary.
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