Topologically protected quantum entanglement emitters
This study was published in Nature Photonics last week. The experiments implement a topological ring resonator lattice using silicon photonics. A bright pump beam injected into opposite edges of the lattice can then generates two- and four-photon quantum states via four-wave mixing. The relative phase of the two pump beams can be used to control the degree of entanglement of the generated photons. This is to the best of my knowledge the first work to demonstrate generation of four-photon quantum states using a topological lattice.
What I found most surprising about this study is the author list, which includes PsiQuantum CEO Jeremy L. O’Brien under a University of Western Australia affiliation. Getting into Western Australia during the pandemic and their border closure (not even visitors from other Australian states allowed in) must have been quite a challenge!
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