Weak nonlinearities and cluster states

Sebastien G R Louis*, Kae Nemoto, W. J. Munro, T. P. Spiller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We propose a scalable approach to building cluster states of matter qubits using coherent states of light. Recent work on the subject relies on the use of single-photonic qubits in the measurement process. These schemes have a low initial success probability and low detector efficiencies cause a serious blowup in resources. In contrast, our approach uses continuous variables and highly efficient measurements. We present a two-qubit scheme, with a simple homodyne measurement system yielding an entangling operation with success probability 1/2. Then we extend this to a three-qubit interaction, increasing this probability to 3/4. We discuss the important issues of the overhead cost and the time scaling, showing how these can be vastly improved with access to this new probability range.

Original languageEnglish
Article number042323
JournalPhysical Review A
Issue number4
Publication statusPublished - 20 Apr 2007

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