In what they claimed was a world first, researchers at NEC and the state-funded Institute of Physical and Chemical Research successfully demonstrated a circuit that can control the state of a pair of elemental particles and how strongly they interact with one another.
And unlike the recent unverified claims by D-Wave systems, they are actually publishing this like any scientific work, and in Science no less.
Quantum Coherent Tunable Coupling of Superconducting Qubits
A.O. Niskanen, et al., Science v.316, p.723 (2007)
Abstract: To do large-scale quantum information processing, it is necessary to control the interactions between individual qubits while retaining quantum coherence. To this end, superconducting circuits allow for a high degree of flexibility. We report on the time-domain tunable coupling of optimally biased superconducting flux qubits. By modulating the nonlinear inductance of an additional coupling element, we parametrically induced a two-qubit transition that was otherwise forbidden. We observed an on/off coupling ratio of 19 and were able to demonstrate a simple quantum protocol.
Maybe D-Wave Systems could learn from these people.
Zz.
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