One-shot measurement demonstrated for three-photon W-state entanglement
PhysicsUnverifiedUpdated:
An experiment reportedly identified three-photon W-state entanglement in one measurement. It demonstrates a measurement for a state whose remaining particles can retain useful entanglement after one is lost.
An optical circuit identifies W states with 87% accuracy
ScienceAlert reports that physicists from Kyoto University and Hiroshima University measured three-photon W-state entanglement with an optical device acting as an interferometer. The account says the experiment achieved an averaged measurement discrimination fidelity of 0.871 ± 0.039 and identified the W-state condition 87 percent of the time.
According to the account, multiparticle GHZ entangled states could be measured, while an entangled measurement of W states had not yet been experimentally demonstrated.
The team reportedly used a custom discrete Fourier transform optical circuit to make a one-shot measurement of a three-photon W state, rather than reconstructing the state through many measurements as in quantum tomography.
W states differ from GHZ states because, according to the account, useful entanglement remains among the other particles when one entangled particle is lost. The researchers describe the result as a step toward multiparticle measurements for photonic quantum computing, communication, and sensing.
Sources
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