Demonstration of a quantum nondemolition sum gate

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 componen...

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Bibliographic Details
Published inPhysical review letters Vol. 101; no. 25; p. 250501
Main Authors Yoshikawa, Jun-Ichi, Miwa, Yoshichika, Huck, Alexander, Andersen, Ulrik L, van Loock, Peter, Furusawa, Akira
Format Journal Article
LanguageEnglish
Published United States 19.12.2008
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Summary: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)10.1103/PhysRevA.71.042308], 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.101.250501