Modular tunable coupler for superconducting qubits

• URL: http://arxiv.org/abs/2207.06607v3
• Date: Mon, 1 May 2023 19:38:09 GMT
• Title: Modular tunable coupler for superconducting qubits
• Authors: Daniel L. Campbell, Archana Kamal, Leonardo Ranzani, Michael Senatore, and Matthew LaHaye
• Abstract summary: We propose a versatile and internally-tunable double-transmon coupler architecture that implements tunable coupling via flux-controlled interference in a three-junction dcSQUID. The DTC possesses an internally defined zero-coupling state that is independent of the coupled data qubits or circuit resonators.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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