Double-sided coaxial circuit QED with out-of-plane wiring

Rahamim, Joseph; Behrle, Tanja; Peterer, Michael; Patterson, Andrew D.; Spring, Peter; Tsunoda, Takahiro; Manenti, Riccardo; Tancredi, Giovanna; Leek, Peter

doi:10.1063/1.4984299

Cited by 38 publications

(33 citation statements)

References 25 publications

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“…A sketch of the experimental device is shown in FIG.1 (a). It is a two-qubit version of the coaxial circuit QED architecture presented in [15]. Coaxially-shaped transmon qubits ('coaxmons') lying in one plane on the upper surface of a substrate are capacitively coupled to individual readout resonators on the lower surface of the substrate.…”

Section: Methodsmentioning

confidence: 99%

Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons

et al. 2019

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Quantum computation requires the precise control of the evolution of a quantum system, typically through application of discrete quantum logic gates on a set of qubits. Here, we use the cross-resonance interaction to implement a gate between two superconducting transmon qubits with a direct static dispersive coupling. We demonstrate a practical calibration procedure for the optimization of the gate, combining continuous and repeated-gate Hamiltonian tomography with step-wise reduction of dominant two-qubit coherent errors through mapping to microwave control parameters. We show experimentally that this procedure can enable aẐX −π/2 gate with a fidelity F = 97.0(7)%, measured with interleaved randomized benchmarking. We show this in a architecture with out-of-plane control and readout that is readily extensible to larger scale quantum circuits.

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Section: Methodsmentioning

confidence: 99%

Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons

et al. 2019

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“…5. This model is based on an architecture in which universal quantum control and readout have been demonstrated [31,32]. For the purpose of probing cavity-mediated cross-talk qubit couplers and readout circuitry are not included in the model, although we illustrate how a nearest-neighbor capacitive-coupling network might be implemented in Fig.…”

Section: Fe Simulation Of Monolithic Superconducting Qubit Devicementioning

confidence: 99%

Modeling Enclosures for Large-Scale Superconducting Quantum Circuits

et al. 2020

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Superconducting quantum circuits are typically housed in conducting enclosures in order to control their electromagnetic environment. As devices grow in physical size, the electromagnetic modes of the enclosure come down in frequency and can introduce unwanted long-range cross-talk between distant elements of the enclosed circuit. Incorporating arrays of inductive shunts such as through-substrate vias or machined pillars can suppress these effects by raising these mode frequencies. Here, we derive simple, accurate models for the modes of enclosures that incorporate such inductive-shunt arrays. We use these models to predict that cavity-mediated interqubit couplings and drive-line cross-talk are exponentially suppressed with distance for arbitrarily large quantum circuits housed in such enclosures, indicating the promise of this approach for quantum computing. We find good agreement with a finite-element simulation of an example device containing more than 400 qubits.

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“…On the other hand, in the designs used by IBM [8] and Delft University of Technology [9], both of the electrodes are floated with respect to the ground, and the two capacitances are equal, i.e., C g = C g' . There is another approach using concentric circular electrodes without ground plane on chip, where their sample package serves as a ground [10], [11]. We employ asymmetric ground coupling capacitors C g C g' to the on-chip ground electrodes ( Fig.…”

Section: Superconducting Qubitsmentioning

confidence: 99%