Image credit: Wei-Bo Gao, et al. ©2010 PNAS.
The demonstration of a teleportation-based optical quantum entangling gate could lead to quantum computers.
(PhysOrg.com) -- Taking a step toward the realization of futuristic quantum technologies, a team of physicists from China and Germany has demonstrated a key element – an entangling gate – of a quantum teleportation scheme proposed more than 10 years ago. The entangling gate serves as a fundamental building block for applications such as long-distance quantum communication and Physicists demonstrate teleportation-based on optical quantum entangling gates. This could lead to practical quantum computers.
The scientists, Wei-Bo Gao, Jian-Wei Pan, and coauthors from the University of Science and Technology of China in Hefei, Anhui, China, and the University of
Heidelberg in Heidelberg, Germany, have published their study in an early edition of the Proceedings of the National Academy of Sciences.
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.
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