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Journal Article

Demonstration of a Quantum Nondemolition Sum Gate

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Andersen,  Ulrik L.
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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van Loock,  Peter
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Yoshikawa, J.-i., Miwa, Y., Huck, A., Andersen, U. L., van Loock, P., & Furusawa, A. (2008). Demonstration of a Quantum Nondemolition Sum Gate. PHYSICAL REVIEW LETTERS, 101(25): 250501. doi:10.1103/PhysRevLett.101.250501.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6C47-7
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.