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Phys Rev Lett. 2010 Jun 25;104(25):250503. Epub 2010 Jun 23.

Arbitrarily large continuous-variable cluster states from a single quantum nondemolition gate.

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Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.


We present a compact experimental design for producing an arbitrarily large optical continuous-variable cluster state using just one single-mode vacuum squeezer and one quantum nondemolition gate. Generating the cluster state and computing with it happen simultaneously: more entangled modes become available as previous modes are measured, thereby making finite the requirements for coherence and stability even as the computation length increases indefinitely.

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