High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions

Abstract

We study the speed/fidelity trade-off for a two-qubit phase gate implemented in ${}^{43}$Ca${}^{+}$ hyperfine trapped-ion qubits. We characterize various error sources contributing to the measured fidelity, allowing us to account for errors due to single-qubit state preparation, rotation and measurement (each at the $\sim 0.1\%$ level), and to identify the leading sources of error in the two-qubit entangling operation. We achieve gate fidelities ranging between $97.1(2)\%$ (for a gate time $t_g=3.8\mu$s) and $99.9(1)\%$ (for $t_g=100\mu$s), representing respectively the fastest and lowest-error two-qubit gates reported between trapped-ion qubits by nearly an order of magnitude in each case.

Preliminary report; more details to be given in a future version. 1 trap, 2 ions, 3 nines

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• Laser Cooling and Hyperfine Measurements of Radium-225 Ions
• Minimum Synthesis Cost of CNOT Circuits
• Quantum Theory from Principles, Quantum Software from Diagrams
• Barenco gate implementation using driven two- and three-qubit spin chains
• Analysis of quantum information processors using quantum metrology
• Novel permanent magnet array geometries for scalable trapped-ion quantum computing in a laser-free entanglement architecture
• Efficient Three-Dimensional Sub-Doppler Cooling of ${}^{40}$Ca${}^{+}$ in a Penning Trap
• Multilevel Electromagnetically Induced Transparency Cooling
• Entanglement dynamics via Geometric phases in Trapped-ions
• Ion-Trap Chip Architecture Optimized for Implementation of Quantum Error-Correcting Code
• Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits
• Programming quantum computers using 3-D puzzles, coffee cups, and doughnuts
• Single-photon quantum regime of artificial radiation pressure on a surface acoustic wave resonator
• Fault-tolerant Quantum Error Correction Using a Linear Array of Emitters
• Robust shaped pulses for arrays of superconducting or semiconductor spin qubits with fixed Ising coupling
• The Virtual Quantum Device (VQD): A tool for detailed emulation of quantum computers
• Robust Oscillator-Mediated Phase Gates Driven by Low-Intensity Pulses
• Long-distance coupling of spin qubits via topological magnons
• Enhanced ion-cavity coupling through cavity cooling in the strong coupling regime
• Interplay of magnetic states and hyperfine fields of iron dimers on MgO(001)
• Quantum Computation
• Fault-tolerant fidelity based on few-qubit codes: Parity-check circuits for biased error channels
• An optically-heated atomic source for compact ion trap vacuum systems
• Engineering Strong Beamsplitter Interaction between Bosonic Modes via Quantum Optimal Control Theory
• Two-qubit quantum Fourier transform and entanglement protected by circulant symmetry
• Geometric and holonomic quantum computation
• Robust entanglement by continuous dynamical decoupling of the J-coupling interaction
• From Independent to Joint: Enhancing Quantum Phase and Correlation Factor Estimation by Squeezed Reservoir Engineering