We investigate experiments of continuous-variable quantum information processing based on theteleportation scheme. Quantum teleportation, which is realized by a two-mode squeezed vacuum state andmeasurement-and-feedforward, is considered as an elementary quantum circuit as well as quantum commu-nication. Вy modifying ancilla states or measurement-and-feedforwards, we can realize various quantum cir-cuits which suffice for universal quantum computation. In order to realize the teleportation-based computa-tion we improve the level of squeezing, and fidelity of teleportation. With a high-fidelity teleporter we dem-onstrate some advanced teleportation experiments, i.e., teleportation of a squeezed state and sequentialteleportation of a coherent state. Moreover, as an example of the teleportation-based computation, we builda QND interaction gate which is a continuous-variable analog of a CNOT gate. A QND interaction gate isconstructed only with ancillary squeezed vacuum states and measurement-and-feedforwards. We also createcontinuous-variable four mode cluster type entanglement for further application, namely, one-way quantumcomputation.
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