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Coupled Three-Mode Squeezed Vacuum
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Multipartite entanglement is a key resource for various quantum information tasks. Here, we present a scheme for generating genuine tripartite entanglement via nonlinear optical processes. We derive, in the Fock basis, the corresponding output state which we termed the coupled three-mode squeezed vacuum. We find unintuitive behaviors arise in intensity squeezing between two of the three output modes due to the coupling present. We also show that this state can be genuinely tripartite entangled.
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Fully-connected three-mode squeezed vacuum: Gaussian entanglement, steering, and collective photon subtraction
In the symmetric fully-connected three-mode squeezed vacuum, all pairwise Gaussian steering vanishes exactly while collective one-versus-two steering and collective-mode photon-subtraction Wigner negativity remain nonzero.
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