Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large Josephson junction
Y. D. Wang, P. Zhang, D. L. Zhou, C. P. Sun
DOI 10.1103/PhysRevB.70.224515 · Physical Review B
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Abstract
We propose a theoretical protocol for quantum logic gates between two Josephson junction charge-phase qubits through the control of their coupling to a large junction whose Josephson coupling energy is much larger than its Coulomb charge energy. In the low excitation limit of the large junction, it behaves effectively as a quantum data-bus mode of a harmonic oscillator. Our protocol can be fast since it does not require the data-bus to stay adiabatically in its ground state, as such it can be implemented over a wide parameter regime independent of the data-bus quantum state.
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