Apparatus for providing Bell fusion based on error correction

Abstract

An apparatus for providing Bell fusion comprises a measurement unit configured to apply a Bell fusion operator to a plurality of Bell blocks 10-1, 10-n corresponding to pairs of photons 1-m in a quantum entanglement state to sequentially measure a zeroth level 10 of a Bell state for each of the plurality of Bell blocks; a selection unit configured to select a Bell fusion operator to be applied to a next Bell block of the plurality of Bell blocks based on a result of measuring a zeroth level of Bell state for a previous Bell block corresponding to the next Bell block; and an identification unit configured to identify a first level of Bell state for a Bell box 20 including the plurality of Bell blocks based on a result of measuring a zeroth level of Bell state for each of the plurality of Bell blocks. A second level for a Bell network is also identified. Bell fusion is achieved using linear optics. Quantum error correction is achieved through a hierarchical Bell state measurement in a feed-forward method increasing the success probability of fusion. Limiting the number of failure for the Bell state measurement improves the limitation of photon losses.

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