Tunable coupling architecture of several QUBITS using superconducting fixed-frequency QUBITS

摘要

Various embodiments provide a coupling mechanism, an activation method, and a square grid. The coupling mechanism has two qubits (102, 104) and a tunable coupling qubit (106) that activates an interaction between the two qubits (102, 104) by modulating a frequency of the tunable coupling qubit. The tunable coupling qubit (106) capacitively couples the two qubits (102, 104). The tunable coupling qubit (106) is modulated on a difference frequency of the two qubits (102, 104). The difference frequency can be considerably greater than anharmonicity of the two qubits (102, 104). The tunable coupling qubit (106) may be separated by two electrodes separated by a two Josephson junctions superconducting quantum interference unit (SQUID) ring, or by a single electrode having a ground coupling SQUID ring with the two qubits (102 , 104). The SQUID ring is controlled by an inductively coupled flux bias line positioned in the center of the tunable coupling qubit.