On-demand single-electron transfer between distant quantum dots. Electrons surfing on a sound wave as a platform for quantum optics with flying electrons.
Dipole coupling of a double quantum dot to a microwave resonator. Field tuning the g factor in InAs nanowire double quantum dots. Spin-orbit qubit in a semiconductor nanowire. Coherent quantum state storage and transfer between two phase qubits via a resonant cavity. Realization of three-qubit quantum error correction with superconducting circuits. Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics. Coherent manipulation of coupled electron spins in semiconductor quantum dots. Driven coherent oscillations of a single electron spin in a quantum dot. Our results demonstrate how the cQED architecture can be used as a sensitive probe of single-spin physics and that a spin–cavity coupling rate of about one megahertz is feasible, presenting the possibility of long-range spin coupling via superconducting microwave cavities. Furthermore, the strong spin–orbit interaction of indium arsenide allows us to drive spin rotations electrically with a local gate electrode, and the charge–cavity interaction provides a measurement of the resulting spin dynamics. The architecture allows us to achieve a charge–cavity coupling rate of about 30 megahertz, consistent with coupling rates obtained in gallium arsenide quantum dots 10. Here we combine the cQED architecture with spin qubits by coupling an indium arsenide nanowire double quantum dot to a superconducting cavity 8, 9. Circuit quantum electrodynamics (cQED) allows spatially separated superconducting qubits to interact via a superconducting microwave cavity that acts as a ‘quantum bus’, making possible two-qubit entanglement and the implementation of simple quantum algorithms 5, 6, 7. Although fast, 180-picosecond, two-quantum-bit (two-qubit) operations can be realized using nearest-neighbour exchange coupling 4, a scalable, spin-based quantum computing architecture will almost certainly require long-range qubit interactions. Electron spins trapped in quantum dots have been proposed as basic building blocks of a future quantum processor 1, 2, 3.
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