Multi-Qubit Algorithms on a 6-Qubit Si/SiGe Processor

We demonstrate the execution of fundamental quantum algorithms on a six-qubit SiGe quantum dot processor compatible with industrial semiconductor processes. This platform features long T1 times (>350ms) and T*2 (20μs), high-fidelity single (>99.9% fidelity) and two qubit CZ gates (>99.3% fidelity), readout on all qubits, fast virtual-Z operations, and multi-qubit control across a linear quantum dot array.

We implemented key foundational algorithms for quantum information processing, including: quantum state teleportation (>90% fidelity), GHZ state preparation (>90% fidelity), and the Bernstein–Vazirani problem (>90% chance of getting the correct solution).

These experiments demonstrate the ability of our device to execute algorithmic primitives such as entanglement generation, multi-qubit interference, and arbitrary state preparation in a semiconductor spin-qubit platform.

Demonstrating these capabilities represents a significant milestone in advancing the Si/SiGe platform's practical utility. The results highlight silicon spin qubits potential for scalable and energy-efficient quantum computation. Next steps will be to enable intermediate and long-distance qubit connectivity through single electron shuttlers.