Thread by @fgrosshans

Now at #MCQS, Valentina Parigi from @lkb_lab on Reconfigurable optical implementation of quantum complex networks
#LTQI

@lkb_lab .@vparigi81’s synchonously pumped OPO (SPOPO) leads to a complex multimode entanglement structure. She then uses multimode homodyne detection to characterize the corresponding 16-mode covariance matrix.
Eigenmodes found from diagonalization are Hermite-Gauss modes
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@lkb_lab @vparigi81 .@vparigi: showed that all 151k+ partitions of 10 frequency modes are not separable: we are indeed in a multipartite entanglement case.
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@lkb_lab @vparigi81 @vparigi .@vparigi81 : The Bloch Messiah decomposition rewrites the operation S done by the SPOP as S=R₁^T Δ R₂ , where R are basis change, and Δ is squeezing. Since input is vaccum, we can forget R₂, so Sp R₁^T Δ.
She applies it to cluster states
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.@vparigi81 now looks at quantum complex networks, through cluster/graph states. She looks at the network dynamics of harmonic oscillators with spring like coupling following a graph #LTQI #MCQS

.@vparigi81 can use her SPOPO to simulate such networks. See arxiv:1708.08726 arxiv.org/abs/1708.08726
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.@vparigi81 wants to use her system to probe several kind of 50-nodes complex networks. Work is being done to allow the detection of this many nodes (currently 16 modes)
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.@vparigi81 also want to introduce non-Gaussian operations in her networks, via photon subtraction #LTQI #MCQS

@lkb_lab .@vparigi81’s talk at #MCQS on Reconfigurable optical implementation of quantum complex networks is avaiable at

#LTQI