Measurement-based entanglement of semiconductor spin qubits
Remy L. Delva, Jonas Mielke, Guido Burkard, J. R. Petta · Physical review. B./Physical review. B · 2024
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 $|{\mathrm{\ensuremath{\Psi}}}_{+}\ensuremath{\rangle}$ of $\ensuremath{\approx}61%$. By increasing the cavity outcoupling rate by a factor of 10, we are able to obtain an improvement of this metric to $\ensuremath{\approx}81%$ while maintaining a yield of 33%.