Fluxon-based gate controls of capacitively coupled flux-based-phase qubits
Shigemasa Matsuo, Kanoko Furuta, Toshiyuki Fujii, Katsuhiko Nagai, Noriyuki Hatakenaka · Applied Physics Letters · 2007
The authors propose a scheme for controlling the gate operation for qubit-qubit interactions in superconducting flux-based phase qubits using a moving fluxon. The basic unit is composed of three capacitively coupled flux-based phase qubits. One of the qubits acts as a switch connecting the other two (two logical qubits) with an identical energy separation. The fluxon controls the energy separation of the switch qubit via its inductive coupling, leading to the resonance among qubits appropriately adjusting the fluxon velocity. As a result, the resonance is capable of performing a gate operation between two logical qubits.