An optical fusion gate for w-states

Ş K. Özdemir, E. Matsunaga, T. Tashima, T. Yamamoto, M. Koashi, N. Imoto

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


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 basedon recycling and outperforms the optimal strategy for the non-recycling case.

Original languageEnglish (US)
Article number103003
JournalNew Journal of Physics
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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