Two-Qubit EIT Gate Protocol
We have demonstrated the UK’s first neutral atom quantum gate using a novel protocol based on electromagnetically induced transparency (EIT) originally proposed by M. Müller, I. Lesanovsky and P. Zoller back in 2008, with our results published in Phys. Rev. Lett. 129, 200501 (2022).
We achieved a corrected CNOT gate fidelity of 0.82(6), mainly limited by available laser power, and used this gate to prepare a Bell state on two qubits.
This provides a scalable gate protocol capable of performing a native CNOT gate and maps to CNOTN gates with N targets for stabiliser measurements in quantum error correction, for which we proposed with experimental upgrades including performing excitation via the inverted 7P1/2 transition to reach intrinsic fidelities F>0.998.
For more details see our paper Phys. Rev. Lett. 129, 200501 (2022).