Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/app112311309
Keywords
flux qubit; galvanic coupling; inductive interaction
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This study investigates the galvanic coupling schemes of superconducting flux qubits and finds that the inductive coupling strength needs to be exactly included to satisfy the criteria of fault-tolerant quantum computing.
We investigate the galvanic coupling schemes of superconducting flux qubits. From the fundamental boundary conditions, we obtain the effective potential of the coupled system of two or three flux qubits to provide the exact Lagrangian of the system. While usually the two-qubit gate has been investigated approximately, in this study we derive the exact inductive coupling strength between two flux qubits coupled directly and coupled through a connecting central loop. We observe that the inductive coupling strength needs to be included exactly to satisfy the criteria of fault-tolerant quantum computing.
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