Weak non-linearities and cluster states

Details Weak non-linearities and cluster states Weak non-linearities and cluster states

2007-04-16

arxiv.org/abs/0704.1931v1

Phys. Rev. A 75, 042323 (2007)

Physics

Quantum Physics

5 pages, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.75.042323

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.

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