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We report on the first experimental realization of the controlled-not (cnot) quantum gate and entanglement for two individual atoms of different isotopes and demonstrate a negligible cross talk between two atom qubits. The experiment is based on a strong Rydberg blockade for ^87Rb and ^85Rb atoms confined in two single-atom optical traps separated by 3. 8 μm. The raw fidelities of the cnot gate and entanglement are 0. 73±0. 01 and 0. 59±0. 03, respectively, without any corrections for atom loss or trace loss. Our work has applications for simulations of many-body systems with multispecies interactions, for quantum computing, and for quantum metrology.
Zeng et al. (Wed,) studied this question.