Modular tunable coupler for superconducting qubits

Abstract

The development of modular and versatile quantum interconnect hardware is a key next step in the scaling of quantum information platforms to larger size and greater functionality. For superconducting quantum systems, fast and well-controlled tunable circuit couplers will be paramount for achieving high fidelity and resource efficient connectivity, whether for performing two-qubit gate operations, encoding or decoding a quantum data bus, or interfacing across modalities. Here we propose a versatile and internally-tunable double-transmon coupler (DTC) architecture that implements tunable coupling via flux-controlled interference in a three-junction dcSQUID. Crucially, the DTC possesses an internally defined zero-coupling state that is independent of the coupled data qubits or circuit resonators. This makes it particular attractive as a modular and versatile design element for realizing fast and robust linear coupling in several applications such as high-fidelity two-qubit gate operations, qubit readout, and quantum bus interfacing.

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Cited by in corpus (15)

• Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
• Modular quantum processor with an all-to-all reconfigurable router
• Cyclic solid-state quantum battery: Thermodynamic characterization and quantum hardware simulation
• Tunable coupler to fully decouple and maximally localize superconducting qubits
• Dynamical blockade of a reservoir for optimal performances of a quantum battery
• Boosting energy transfer between quantum devices through spectrum engineering in the dissipative ultrastrong coupling regime
• High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
• Efficient two-qutrit gates in superconducting circuits using parametric coupling
• Collisional charging of a transmon quantum battery
• State Preparation in a Jaynes-Cummings Lattice with Quantum Optimal Control
• Capacitively Shunted Double-Transmon Coupler Realizing Bias-Free Idling and High-Fidelity CZ Gate
• Quantum Shortcut to Adiabaticity for State Preparation in a Finite-Sized Jaynes-Cummings Lattice
• Bosonic Entanglement and Quantum Sensing from Energy Transfer in two-tone Floquet Systems
• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
• Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance