Fig. 2: Non-destructive stabilizer measurements with real-time feedforward.
From: Fault-tolerant operation of a logical qubit in a diamond quantum processor
a, Circuit diagram for the deterministic preparation of a four-qubit GHZ entangled state \(({| {\rm{\psi }}\rangle }_{+}=(| 0000\rangle +| 1111\rangle )/\sqrt{2})\) using a measurement of the stabilizer XXXX. b, Measured expectation values of the 15 operators that define the ideal state. The obtained fidelity with the target state is 0.86(1), confirming genuine multipartite entanglement. Grey bars show the ideal expectation values. Error bars are one standard deviation.
