Two-qubit entangling gates within arbitrarily long chains of trapped ions

摘要: Ion trap quantum computers are based on modulating the Coulomb interaction between atomic ion qubits using external forces. However, spectral crowding of collective motional modes could pose a challenge to control such interactions for large numbers qubits. Here, we show that high-fidelity gate operations still possible with very trapped crystals by small and fixed number modes, simplifying scaling computers. We present analytical work shows need not couple motion distant ions, allowing parallel entangling gates crosstalk error falls off as inverse cube distance pairs. also experimentally demonstrate fully connected set seventeen $^{171}\mathrm{Yb}^{+}$ simple laser pulse shapes primarily just few modes.