Physicists demonstrate teleportation-based optical quantum entangling gate: The work builds on earlier research by D. Gottesman and I. L. Chuang, who theoretically showed in 1999 that a quantum gate can be built by teleporting qubits (the basic units of quantum information) with the help of certain entangled states. In quantum teleportation techniques, unknown quantum states are transferred from one location to another through the use of entanglement. One of the key requirements of the "GC scheme" is the ability to perform single-qubit logic operations for quantum computations.
In the new study, Gao, Pan, and coauthors have experimentally demonstrated the feasibility of the GC scheme by demonstrating a logic gate based on quantum teleportation for two photonic qubits. Further, the scientists demonstrated the entangling gate using two different methods – one with a six-photon interferometer to realize controlled-NOT gates, and the other with four-photon hyperentanglement to realize controlled-Phase gates.