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Journal Article

Demonstration of a universal one-way quantum quadratic phase gate


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

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Miwa, Y., Yoshikawa, J.-i., van Loock, P., & Furusawa, A. (2009). Demonstration of a universal one-way quantum quadratic phase gate. PHYSICAL REVIEW A, 80(5): 050303. doi:10.1103/PhysRevA.80.050303.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6B9F-D
We demonstrate a quadratic phase gate for one-way quantum computation in the continuous-variable regime. This canonical gate, together with phase-space displacements and Fourier rotations, completes the set of universal gates for realizing any single-mode Gaussian transformation such as arbitrary squeezing. As opposed to previous implementations of measurement-based squeezers, the current gate is fully controlled by the local oscillator phase of the homodyne detector. Verifying this controllability, we give an experimental demonstration of the principles of one-way quantum computation over continuous variables. Moreover, we can observe sub-shot-noise quadrature variances in the output states, confirming that nonclassical states are created through cluster computation.