Demonstration of a quantum nondemolition sum gate

Details Demonstration of a quantum nondemolition sum gate Demonstration of a quantum nondemolition sum gate

2008-08-05

arxiv.org/abs/0808.0551v1

Phys. Rev. Lett. 101, 250501 (2008).

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.250501

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 fields. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U.L. Andersen [\pra {\bf 71}, 042308 (2005)], solely based on offline squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.

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