Researchers from Kyoto University and Hiroshima University have created a new technique to identify W states, a complex form of quantum entanglement. The advance could support progress in quantum computing and communication.
A team led by Shigeki Takeuchi demonstrated the method using three photons in a stable optical circuit. The device performs a quantum Fourier transformation based on the cyclic shift symmetry of W states. It distinguishes different three-photon W states in a single measurement without needing extensive adjustments during operation.
