Superconducting quantum devices

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Charge pumping in carbon nanotubes

Physica E Low-dimensional Systems and Nanostructures Elsevier 34:1-2 (2006) 662-665

Authors:

VI Talyanskii, P Leek, M Buitelaar, CG Smith, D Anderson, G Jones, J Wei, D Cobden
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Charge pumping and current quantization in surface acoustic-wave-driven carbon nanotube devices

SEMICONDUCTOR SCIENCE AND TECHNOLOGY 21:11 (2006) S69-S77

Authors:

MR Buitelaar, PJ Leek, VI Talyanskii, CG Smith, D Anderson, GAC Jones, J Wei, DH Cobden
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Charge Pumping in Carbon Nanotubes

(2005)

Authors:

Peter Leek, Mark Buitelaar, Valery Talyanskii, Charles Smith, David Anderson, Geb Jones, Jiang Wei, David Cobden
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Charge pumping in carbon nanotubes

PHYSICAL REVIEW LETTERS 95:25 (2005) ARTN 256802

Authors:

PJ Leek, MR Buitelaar, VI Talyanskii, CG Smith, D Anderson, GAC Jones, J Wei, DH Cobden
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Calibration of the cross-resonance two-qubit gate between directly-coupled transmons

Phys. Rev. Applied 12 064013-064013

Authors:

AD Patterson, J Rahamim, T Tsunoda, P Spring, S Jebari, K Ratter, M Mergenthaler, G Tancredi, B Vlastakis, M Esposito, PJ Leek

Abstract:

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 a $\hat{ZX}_{-\pi/2}$ 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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