An optical fusion gate for W-states

Details An optical fusion gate for W-states An optical fusion gate for W-states

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13j3003o&link_type=abstract

New Journal of Physics, Volume 13, Issue 10, pp. 103003 (2011).

Physics

Scientific paper

We introduce a simple optical gate to fuse arbitrary-size polarization entangled W-states to prepare larger W-states. The gate requires a polarizing beam splitter (PBS), a half-wave plate (HWP) and two photon detectors. We study, numerically and analytically, the necessary resource consumption for preparing larger W-states by fusing smaller ones with the proposed fusion gate. We show analytically that resource requirement scales at most sub-exponentially with the increasing size of the state to be prepared. We numerically determine the resource cost for fusion without recycling where W-states of arbitrary size can be optimally prepared. Moreover, we introduce another strategy that is based on recycling and outperforms the optimal strategy for the non-recycling case.

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