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In large quantum systems, multipartite entanglement can be found in many inequivalent classes. Preparing states of arbitrary size in different classes is important for performing a wide range of quantum protocols. states, in particular, constitute a class with a variety of quantum networking protocols. However, all known schemes for preparing polarization encoded photonic states are probabilistic, with resource requirements increasing at least sub-exponentially. We propose a deterministic scheme for preparing states of size of any power of 2, which requires no prior entanglement and can be performed locally. We introduce an all-optical setup that can efficiently double the size of states of arbitrary size. Our scheme advances the use of states in real-world quantum networks and could be extended to other physical systems.
© 2016 Optical Society of America
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