Demonstration of Unconditional One-Way Quantum Computations for Continuous Variables
Ryuji Ukai, Noriaki Iwata, Yuji Shimokawa, Seiji Armstrong, Alberto Politi, Jun–ichi Yoshikawa, Peter van Loock, Akira Furusawa · Physical Review Letters · 2011
One-way quantum computation is a very promising candidate to fulfill the capabilities of quantum information processing. Here we demonstrate an important set of unitary operations for continuous variables using a linear cluster state of four entangled optical modes. These operations are performed in a fully measurement-controlled and completely unconditional fashion. We implement three different levels of squeezing operations and a Fourier transformation, all of which are accessible by selecting the correct quadrature measurement angles of the homodyne detections. Though not sufficient, these linear transformations are necessary for universal quantum computation.