Entangled photons can now be controlled (Image: Dan Talson/Rex Features)

THERE is a simple rule of computing that holds true even in the weird quantum world: increase the number of units of information available and you boost computing power. Raising the number of quantum bits, or qubits, carries an even greater reward – every additional qubit doubles the computing power.

But raising the number of qubits has proven tricky because of the difficulty of reliably producing entangled particles. Now a team has designed a system that should fire out barrages of entangled photons with machine-gun regularity.

Existing methods of producing entangled …