Universal control of four singlet-triplet qubits

Universal control of four neighboring $S$–$T_{-}$ hole-spin qubits in a $2\times 4$ germanium quantum-dot ladder. This is a polarized-triplet variant of the canonical $S$–$T_0$ encoding.

Key Results

• Average single-qubit gate fidelities of 99.49(8)–99.84(1)%.
• Bell-state fidelities of 73(1)–90(1)% between neighboring qubit pairs.
• Remote Bell-state fidelity of 75(2)% across the array.

Links

• Journal: Nature Nanotechnology
• arXiv: 2312.16101

Zoo Links

• singlet-triplet-qubit