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The new work shows how a well-specified bath affects the qubits in a crystal which behaves as a very primitive quantum computer.
When two Josephson junctions are connected through a standard capacitor, the application of a small a.c. voltage pulse to the first qubit can cause the two qubits to oscillate between two combined states.
The resolution of this addressing technique is about two thousandths of a millimetre - over a length of one millimetre, therefore, several hundred qubits could be stored.
But to perform the logic operations vital to a quantum computer, two qubits have to become entangled.
The ability to couple qubits to photons, demonstrated by the Yale group, could allow qubits on a chip to be wired together via a ‘quantum information bus’ carrying single photons.
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