Demonstration of a universal one-way quantum quadratic phase gate

Details Demonstration of a universal one-way quantum quadratic phase gate Demonstration of a universal one-way quantum quadratic phase gate

2009-06-17

arxiv.org/abs/0906.3141v1

Phys. Rev. A 80, 050303(R) (2009)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevA.80.050303

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.

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