Demonstration of a Quantum Nondemolition Sum Gate

J. Yoshikawa, Y. Miwa, Alexander Huck, Ulrik Lund Andersen, P. van Loock, A. Furusawa

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Abstract

The sum gate is the canonical two-mode gate for universal quantum computation based on continuous quantum variables. It represents the natural analogue to a qubit C-NOT gate. In addition, the continuous-variable gate describes a quantum nondemolition (QND) interaction between the quadrature components of two light modes. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U. L. Andersen [Phys. Rev. A 71, 042308 (2005)], solely based on off-line squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.
Original languageEnglish
JournalPhysical Review Letters
Volume101
Issue number25
Pages (from-to)250501
ISSN0031-9007
DOIs
Publication statusPublished - 2008

Bibliographical note

Copyright 2008 American Physical Society

Keywords

  • CONTINUOUS VARIABLE SYSTEMS
  • CRITERION
  • ERROR-CORRECTION
  • OSCILLATOR

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