High fidelity gates and states in a 5 Xmon qubit Josephson quantum processor, part I: architecture
ORAL
Abstract
One of the greatest challenges in building a quantum architecture is to combine high fidelity logic gates with a multiqubit system. Here, we demonstrate high fidelity gates in a 5 Xmon qubit quantum processor using a multiqubit architecture which combines coherence, control and connectivity. The qubits are arranged in a linear chain with nearest neighbor coupling, have individual control and readout, and reach $T_1$ values up to 57 $\mu$s. We characterize single qubit gates with a fidelity above 99.9 \% for all qubits. Using the frequency tunability of the qubits, we employ a novel implementation of a fast, adiabatic two-qubit controlled-phase gate, measuring fidelities up to 99.45 \%.
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