A natural heavy-hole flopping mode qubit in germanium
arXiv:2012.10214 · doi:10.1103/PhysRevResearch.3.013194
Abstract
Flopping mode qubits in double quantum dots (DQDs) allow for coherent spin-photon hybridization and fast qubit gates when coupled to either an alternating external or a quantized cavity electric field. To achieve this, however, electronic systems rely on synthetic spin-orbit interaction (SOI) by means of a magnetic field gradient as a coupling mechanism. Here we theoretically show that this challenging experimental setup can be avoided in heavy-hole (HH) systems in germanium (Ge) by utilizing the sizeable cubic Rashba SOI. We argue that the resulting natural flopping mode qubit possesses highly tunable spin coupling strengths that allow for one- and two-qubit gate times in the nanosecond range when the system is designed to function in an optimal operation mode which we quantify.
13 pages, 8 figures
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- Transmission-based noise spectroscopy for quadratic qubit-resonator interactions
- Quantum gates in coupled quantum dots controlled by coupling modulation
- Spin-photon coupling using circular double quantum dots
- Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
- Photon-mediated entanglement between spin qubits beyond the dispersive regime