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Quantum computers are expected to achieve a significant speed-up overclassical computers in solving a range of computational problems. Chains ofions held in a linear Paul trap are a promising platform for constructing suchquantum computers, due to their long coherence times and high quality ofcontrol. Here we report on the construction of a small, five-qubit, universalquantum computer using $^{88}\text{Sr}^{+}$ ions in an RF trap. All basicoperations, including initialization, quantum logic operations, and readout,are performed with high fidelity. Selective two-qubit and single-qubit gates,implemented using a narrow linewidth laser, comprise a universal gate set,allowing realization of any unitary on the quantum register. We review the mainexperimental tools, and describe in detail unique aspects of the computer: theuse of robust entangling gates and the development of a quantum coherentfeedback system through EMCCD camera acquisition. The latter is necessary forcarrying out quantum error correction protocols in future experiments.

A trapped ion quantum computer with robust entangling gates and quantum coherent feedback