Measurement-based entanglement of semiconductor spin qubits

Measurement-based entanglement (MBE) is a method for entangling quantum systems through the state projection that accompanies a parity measurement. We derive a stochastic master equation describing measurement-based entanglement of a pair of silicon double-dot flopping-mode spin qubits, develop numerical simulations to model this process, and explore what modifications could enable an experimental implementation of such a protocol. With device parameters corresponding to current qubit and cavity designs, we predict an overlap of the final state of the MBE protocol with the target Bell state |Ψ₊ of ≈61%. By increasing the cavity outcoupling rate by a factor of 10, we are able to obtain an improvement of this metric to ≈81% while maintaining a yield of 33%.