High-fidelity quantum logic gates using trapped-ion hyperfine qubits

Abstract

We demonstrate laser-driven two-qubit and single-qubit logic gates with fidelities 99.9(1)% and 99.9934(3)% respectively, significantly above the approximately 99% minimum threshold level required for fault-tolerant quantum computation, using qubits stored in hyperfine ground states of calcium-43 ions held in a room-temperature trap. We study the speed/fidelity trade-off for the two-qubit gate, for gate times between 3.8$\mu$s and 520$\mu$s, and develop a theoretical error model which is consistent with the data and which allows us to identify the principal technical sources of infidelity.

1 trap, 2 ions, 3 nines. Detailed write-up of arXiv:1406.5473 including single-qubit gate data also

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• Robust shaped pulses for arrays of superconducting or semiconductor spin qubits with fixed Ising coupling
• Engineering Strong Beamsplitter Interaction between Bosonic Modes via Quantum Optimal Control Theory
• Fault-tolerant fidelity based on few-qubit codes: Parity-check circuits for biased error channels
• Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits
• Barenco gate implementation using driven two- and three-qubit spin chains
• From Independent to Joint: Enhancing Quantum Phase and Correlation Factor Estimation by Squeezed Reservoir Engineering
• Novel permanent magnet array geometries for scalable trapped-ion quantum computing in a laser-free entanglement architecture
• Entanglement dynamics via Geometric phases in Trapped-ions
• Two-qubit quantum Fourier transform and entanglement protected by circulant symmetry
• Long-distance coupling of spin qubits via topological magnons
• Ion-Trap Chip Architecture Optimized for Implementation of Quantum Error-Correcting Code
• Efficient Three-Dimensional Sub-Doppler Cooling of ${}^{40}$Ca${}^{+}$ in a Penning Trap
• Analysis of quantum information processors using quantum metrology
• The Virtual Quantum Device (VQD): A tool for detailed emulation of quantum computers