Quantum computing has made another advance along the path from theorists' darling to working device.
A circuit of four superconducting qubits. Scientists have succeeded in entangling three of these. M.NEELEYThe concept depends on entanglement, a strange phenomenon in which the quantum states of spatially separated systems, called 'qubits', become intrinsically linked. The entanglement of two or more qubits sets up a 'superposition' of states in which calculations can run in parallel — in principle allowing a quantum computer to race through problems that it would take a classical computer eons to solve.
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