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IonQ and Duke researchers reported 1,032 entangled ion-memory pairs per second at 87.9% fidelity. In their preprint, they cited estimates that links between error-corrected modules need roughly 10 to 100 times that rate.
In a preprint, Cisco and UC Santa Barbara researchers reported 4% or less decoherence with slow switching and at least 90% fidelity at 1 MHz. Conversion between photon encodings has not yet been demonstrated.
IonQ said it linked two of its commercial trapped-ion computers at a distance in work funded in part through an Air Force Research Laboratory agreement. The company gave no fidelity, entanglement rate, or distance and cited no paper.
The researchers placed both entanglement sources in one Brooklyn building and made the swap at a Manhattan data center. They reported measured rates above 0.65 swaps per second over deployed fiber, or more than 1.5 after a detector correction.
