Year: 2024
Type: article
Abstract: Combining superconducting resonators and quantum dots has triggered tremendous progress in quantum information, however, attempts at coupling a resonator to even charge parity spin qubits have resulted only in weak spin-photon coupling. Here, we integrate a zincblende InAs nanowire double quantum dot with strong spin-orbit interaction in a magnetic-field resilient, high-quality resonator. The quantum confinement in the nanowire is achieved using deterministically grown wurtzite tunnel barriers. Our experiments on even charge parity states and at large magnetic fields, allow us to identify the relevant spin states and to measure the spin decoherence rates and spin-photon coupling strengths. We find an anti-crossing between the resonator mode in the single photon limit and a singlet-triplet qubit with a spin-photon coupling strength of g/2π = 139 ± 4 MHz. This coherent coupling exceeds the resonator decay rate κ/2π = 19.8 ± 0.2 MHz and the qubit dephasing rate γ/2π = 116 ± 7 MHz, putting our system in the strong coupling regime.
Source: Nature Communications
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,652
Awards: Engineered Topological Superconductivity in van der Waals Heterostructures, G434337789, High Impedance Metamaterials for Quantum Simulation with Semiconductor/Superconductor Hybrid Circuits, Quantum-Transport Phenomena in Hybrid Devices based on Nanowires, Fluctuations, Sensing, and Information in Open Quantum Systems, QUSTEC: international, interdisciplinary and intersectoral doctoral programme in Quantum Science and Technologies, Andreev qubits for scalable quantum computation, G993971353
OpenAlex ID: W4391530946