Demonstration of a universal one-way quantum quadratic phase gate

Abstract

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.

5 pages, 4 figures

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• Universal Quantum Computation with Continuous-Variable Cluster States
• Resource-efficient linear optical quantum computation
• Demonstration of a quantum nondemolition sum gate
• Demonstration of deterministic and high fidelity squeezing of quantum information
• 7 dB quadrature squeezing at 860 nm with periodically-poled KTiOPO4

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