A new technique developed by researchers at the Massachusetts Institute of Technology (MIT) removes common errors in the operation of a two-quantum bit (qubit).
MIT's Youngkyu Sung and colleagues extended the concept of tunable couplers, which enable on-and-off switching of two-qubit interactions to control operations while maintaining the qubits.
The tunable couplers were prone to errors from residual unwanted interactions between the qubits and between the qubits and the coupler, and the new method reduces such errors.
The researchers tapped higher energy levels of the coupler to neutralize the interactions.
MIT's William D. Oliver said the technique realized 99.9% fidelity for the two major two-qubit gate models, the Controlled-Z gates and iSWAP gates.
From MIT News
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