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Phys Rev Lett. 2014 Mar 28;112(12):120505. Epub 2014 Mar 26.

Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb.

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Department of Physics, University of Virginia, Charlottesville, Virginia 22903, USA.
School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.


We report the experimental realization and characterization of one 60-mode copy and of two 30-mode copies of a dual-rail quantum-wire cluster state in the quantum optical frequency comb of a bimodally pumped optical parametric oscillator. This is the largest entangled system ever created whose subsystems are all available simultaneously. The entanglement proceeds from the coherent concatenation of a multitude of Einstein, Podolsky, and Rosen pairs by a single beam splitter, a procedure which is also a building block for the realization of hypercubic-lattice cluster states for universal quantum computing.

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