Quantum-dot computing
Gerard J Milburn · Physics World · 2003
A quantum computer would put the latest PC to shame. Not only would such a device be faster than a conventional computer, but by exploiting the quantum-mechanical principle of superposition it could change the way we think about information processing. However, two key goals need to be met before a quantum computer becomes reality. The first is to be able to control the state of a single quantum bit (or “qubit”) and the second is to build a two-qubit gate that can produce “entanglement” between the qubit states. Now Xiaoqin Li at the University of Michigan and co-workers have passed a significant milestone in solid-state quantum computing by demonstrating a two-qubit logic gate using electron – hole pairs in a single quantum dot (X Li et al. 2003 Science 301 809–811).