A single-photon W state can identify random-versus-uniform phase plates with error ~1/(2N), beating a sequential local photon whose error stays at 1/4.
A single photon interacts with a phase plate, and subse- quently, a quantum bit-flip operation is applied
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Identification of Phase Plate Properties Using Photonic Quantum Sensor Networks
A single-photon W state can identify random-versus-uniform phase plates with error ~1/(2N), beating a sequential local photon whose error stays at 1/4.