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Although two-qubit entangling gates are necessary for universal quantumcomputing, they are notoriously difficult to implement with high fidelity.Recently, tunable couplers have become a key component for realizinghigh-fidelity two-qubit gates in superconducting quantum computers. However, itis still difficult to achieve tunable coupling free of unwanted residualcoupling for highly detuned qubits, which are desirable for mitigatingqubit-frequency crowding or errors due to crosstalk between qubits. We thuspropose a design for this kind of tunable coupler, which we call adouble-transmon coupler, because this is composed of two transmon qubitscoupled through a common loop with an additional Josephson junction.Controlling the magnetic flux in the loop, we can achieve not only fasthigh-fidelity two-qubit gates, but also no residual coupling during idle time,where computational qubits are highly detuned fixed-frequency transmons. Theproposed coupler is expected to offer an alternative approach tohigher-performance superconducting quantum computers.

Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits