Abstract

New continuous variable quantum protocols such as cluster state computation [1] and quantum error correction [2] require an increasing number of modes to be entangled in a specific way. Current multi-partite entanglement schemes tend to employ one detection scheme per entangled mode, which introduces an inherent lack of flexibility and is detrimental to its scalability. These optical setups are built to produce one set of outputs or to perform one given protocol; in order to change the output the optical hardware itself must be modified. Here, we demonstrate a system which offers the flexibility to switch between desired outputs, by measuring all of the entangled modes simultaneously with just one detection system [3]. The switching is done in real time, via software only, requiring no modification of the optical setup. This is achieved by applying calculated electronic gain functions to spatial regions of optical modes co-propagating in one beam.

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