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Cross-talk in superconducting qubit lattices with tunable couplers—comparing transmon and fluxonium architectures

Lange, Florian, Lukas Heunisch, Holger Fehske +2 more

Quantum Science and TechnologyJan 1, 20260 citations

Superconducting 3D Transmon Qubits for Analog Quantum Simulations

Oscar Gargiulo, Stefan Oleschko, Phani Raja Muppalla +3 more

Bulletin of the American Physical SocietyMar 15, 20170 citations

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

Hayato Goto

Tunable couplers, which turn on and off the interaction between qubits, have emerged as a key means to achieve low error rates in superconducting quantum computers. Conventional devices using one transmon qubit exhibit unwanted residual coupling, though, especially at the high detuning that is desirable for suppressing crosstalk errors. To solve this critical problem, the author proposes a tunable coupler based on two transmons that satisfies the ideal conditions of no residual coupling and fast two-qubit gate operations at high detuning. This double-transmon coupler is expected to become standard for superconducting architectures by eliminating unwanted coupling during idle time.Tunable couplers, which turn on and off the interaction between qubits, have emerged as a key means to achieve low error rates in superconducting quantum computers. Conventional devices using one transmon qubit exhibit unwanted residual coupling, though, especially at the high detuning that is desirable for suppressing crosstalk errors. To solve this critical problem, the author proposes a tunable coupler based on two transmons that satisfies the ideal conditions of no residual coupling and fast two-qubit gate operations at high detuning. This double-transmon coupler is expected to become standard for superconducting architectures by eliminating unwanted coupling during idle time.

arXiv:2203.11451Physical Review AppliedSep 15, 202235 citations

Gate-compatible circuit quantum electrodynamics in a three-dimensional cavity architecture

Zezhou Xia, Jierong Huo, Zonglin Li +14 more

Semiconductor-based superconducting qubits offer a versatile platform for studying hybrid quantum devices in circuit quantum electrodynamics (QED) architecture. Most of these circuit QED experiments utilize coplanar waveguides, where the incorporation of dc gate lines is straightforward. Here, we present a technique for probing gate-tunable hybrid devices using a three-dimensional (3D) microwave cavity. A recess is machined inside the cavity wall for the placement of devices and gate lines. We validate this design using a hybrid device based on an InAs-Al nanowire Josephson junction. The coupling between the device and the cavity is facilitated by a long superconducting strip, the antenna. The Josephson junction and the antenna together form a gatemon qubit. We further demonstrate the gate-tunable cavity shift and two-tone qubit spectroscopy. This technique could be used to probe various quantum devices and materials in a 3D circuit QED architecture that requires dc gate voltages.Semiconductor-based superconducting qubits offer a versatile platform for studying hybrid quantum devices in circuit quantum electrodynamics (QED) architecture. Most of these circuit QED experiments utilize coplanar waveguides, where the incorporation of dc gate lines is straightforward. Here, we present a technique for probing gate-tunable hybrid devices using a three-dimensional (3D) microwave cavity. A recess is machined inside the cavity wall for the placement of devices and gate lines. We validate this design using a hybrid device based on an InAs-Al nanowire Josephson junction. The coupling between the device and the cavity is facilitated by a long superconducting strip, the antenna. The Josephson junction and the antenna together form a gatemon qubit. We further demonstrate the gate-tunable cavity shift and two-tone qubit spectroscopy. This technique could be used to probe various quantum devices and materials in a 3D circuit QED architecture that requires dc gate voltages.

arXiv:2311.07337Physical Review AppliedMar 18, 20248 citations

Weakly-tunable transmon qubits in a multi-qubit architecture

Jared Hertzberg, Nicholas T. Bronn, Antonio D. Corcoles +7 more

Bulletin of the American Physical SocietyMar 16, 20160 citations

Beyond the transmon: A new generation of superconducting qubits

David Schuster

Bulletin of the American Physical SocietyMar 5, 20190 citations

A Fast Tunable 3D-Transmon Architecture for Superconducting Qubit-Based Hybrid Devices

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