Two-Qubit Couplings of Singlet-Triplet Qubits Mediated by One Quantum State

Understand

We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS).

• The QS can be provided by a quantum dot itself or by another confined system.
• The orbital energies of the QS are tunable using an electric gate close to the QS, which changes the interactions between the STQs independent of their single-qubit parameters.
• Short gating sequences exist for the controlled NOT (CNOT) operations.