Superconducting coupler with exponentially large on-off ratio

Abstract

Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. However, most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio and without the need for fine-tuning. Our approach is based on a bus mode supplemented by an ancillary nonlinear resonator mode. Driving the ancillary mode leads to a coupler-state-dependent field displacement in the resonator which, in turn, results in an exponential suppression of real and virtual two-qubit interactions with respect to the drive power. A superconducting circuit implementation supporting the proposed mechanism is presented.

References in corpus (10)

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Cited by in corpus (10)

• Dynamics of Transmon Ionization
• Scalable High-Performance Fluxonium Quantum Processor
• Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits
• High-Coherence Kerr-cat qubit in 2D architecture
• Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers
• Quarter-wave Resonator Based Tunable Coupler for Xmon Qubits
• Control the qubit-qubit coupling in the superconducting circuit with double-resonator couplers
• Near-ultrastrong nonlinear light-matter coupling in superconducting circuits
• Flying-cat parity checks for quantum error correction
• Residual-$ZZ$-coupling suppression and fast two-qubit gate for Kerr-cat qubits based on level-degeneracy engineering