Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots

Abstract

We propose a setup for universal and electrically controlled quantum information processing with hole spins in Ge/Si core/shell nanowire quantum dots (NW QDs). Single-qubit gates can be driven through electric-dipole-induced spin resonance, with spin-flip times shorter than 100 ps. Long-distance qubit-qubit coupling can be mediated by the cavity electric field of a superconducting transmission line resonator, where we show that operation times below 20 ns seem feasible for the entangling square-root-of-iSWAP gate. The absence of Dresselhaus spin-orbit interaction (SOI) and the presence of an unusually strong Rashba-type SOI enable precise control over the transverse qubit coupling via an externally applied, perpendicular electric field. The latter serves as an on-off switch for quantum gates and also provides control over the g factor, so single- and two-qubit gates can be operated independently. Remarkably, we find that idle qubits are insensitive to charge noise and phonons, and we discuss strategies for enhancing noise-limited gate fidelities.

6 pages main article + 12 pages supplement, 4 figures

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• Self-controlled growth of highly uniform Ge/Si hut wires for scalable qubit devices
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• Fully tunable longitudinal spin-photon interactions in Si and Ge quantum dots
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• Strongly Interacting Holes in Ge/Si Nanowires
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• Hamiltonian engineering for robust quantum state transfer and qubit readout in cavity QED
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• Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
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• Low-energy hole subband dispersions in a cylindrical Ge nanowire: the effects of the nanowire growth direction
• Longitudinal coupling between electrically driven spin-qubits and a resonator
• Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter
• Two-band description of the strong `spin'-orbit coupled one-dimensional hole gas in a cylindrical Ge nanowire
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