Coherent control of a triangular exchange-only spin qubit

Abstract

We demonstrate coherent control of a three-electron exchange-only spin qubit with the quantum dots arranged in a close-packed triangular geometry. The device is tuned to confine one electron in each quantum dot, as evidenced by pairwise charge stability diagrams. Time-domain control of the exchange coupling is demonstrated and qubit performance is characterized using blind randomized benchmarking, with an average single-qubit gate fidelity F = 99.84%. The compact triangular device geometry can be readily scaled to larger two-dimensional quantum dot arrays with high connectivity.

References in corpus (8)

• Semiconductor Spin Qubits
• Universal control of a six-qubit quantum processor in silicon
• Scalable gate architecture for densely packed semiconductor spin qubits
• Quantum error correction with silicon spin qubits
• Universal logic with encoded spin qubits in silicon
• Operating semiconductor quantum processors with hopping spins
• Fast and high-fidelity state preparation and measurement in triple-quantum-dot spin qubits
• High-precision real-space simulation of electrostatically-confined few-electron states

Cited by in corpus (9)

• Single-step high-fidelity three-qubit gates by anisotropic chiral interactions
• Multi-qubit DC gates over an inhomogeneous array of quantum dots
• Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
• Omnidirectional shuttling to avoid valley excitations in Si/SiGe quantum wells
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Negative exchange interaction in Si quantum dot arrays via valley-phase induced ${\mathbb{Z}}_2$ gauge field
• Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits
• Comparison of spin-qubit architectures for quantum error-correcting codes
• Jenga-Krotov algorithm: Efficient compilation of multi-qubit gates for exchange-only qubits