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Continuous-variable quantum information processing with squeezed states of light

  • Quantum Informatics. Quantum Information Processors
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Abstract

We investigate experiments of continuous-variable quantum information processing based on the teleportation scheme. Quantum teleportation, which is realized by a two-mode squeezed vacuum state and measurement-and-feedforward, is considered as an elementary quantum circuit as well as quantum communication. By modifying ancilla states or measurement-and-feedforwards, we can realize various quantum circuits which suffice for universal quantum computation. In order to realize the teleportation-based computation we improve the level of squeezing, and fidelity of teleportation. With a high-fidelity teleporter we demonstrate some advanced teleportation experiments, i.e., teleportation of a squeezed state and sequential teleportation of a coherent state. Moreover, as an example of the teleportation-based computation, we build a QND interaction gate which is a continuous-variable analog of a CNOT gate. A QND interaction gate is constructed only with ancillary squeezed vacuum states and measurement-and-feedforwards. We also create continuous-variable four mode cluster type entanglement for further application, namely, one-way quantum computation.

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Authors and Affiliations

  1. Department of Applied Physics, School of Engineering, The University of Tokyo, 113-8656, Tokyo, Japan

    H. Yonezawa & A. Furusawa

  2. Japan Science and Technology (JST) Agency, CREST, 103-0028, Tokyo, Japan

    H. Yonezawa & A. Furusawa

Authors
  1. H. Yonezawa
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  2. A. Furusawa
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Yonezawa, H., Furusawa, A. Continuous-variable quantum information processing with squeezed states of light. Opt. Spectrosc. 108, 288–296 (2010). https://doi.org/10.1134/S0030400X10020189

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  • DOI: https://doi.org/10.1134/S0030400X10020189

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