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Magnetically tunable singlet-triplet spin qubit in a four-electron coupled quantum dot

Tuning a qubit’s level spacing into resonance with other qubits is vital for coupling them into a quantum network. This is not possible with traditional two-electron self-assembled qubits. This paper presented the design and first measurements of a novel four-electron qubit, which features a fully tunable ground state splitting. These results were first presented in an invited talk at the 2013 Rank Prize Symposium on “Semiconductor Nano-photonics for Quantum Information Science”, where they were very well-received. It has led to a collaboration with ETH Zurich (the Imamoglu group), developing a proposal for long-distance multi-qubit coupling.