Single-qubit gates with errors at the $10^{-7}$ level

Abstract

We report the achievement of single-qubit gates with sub-part-per-million error rates, in a trapped-ion ${}^{43}$Ca${}^{+}$ hyperfine clock qubit. We explore the speed/fidelity trade-off for gate times $4.4\le t_g\le 35\mu$s, and benchmark a minimum error per Clifford gate of $1.5(4)\times 10^{-7}$. Calibration errors are suppressed to $<10^{-8}$, leaving qubit decoherence ($T_2\approx 70$ s), leakage, and measurement as the dominant error contributions. The ion is held above a microfabricated surface-electrode trap which incorporates a chip-integrated microwave resonator for electronic qubit control; the trap is operated at room temperature without magnetic shielding.

References in corpus (24)

• Surface codes: Towards practical large-scale quantum computation
• Randomized Benchmarking of Quantum Gates
• Optimized Dynamical Decoupling in a Model Quantum Memory
• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• How to Enhance Dephasing Time in Superconducting Qubits
• Towards fault-tolerant quantum computing with trapped ions
• A Race Track Trapped-Ion Quantum Processor
• Erasure conversion for fault-tolerant quantum computing in alkaline earth Rydberg atom arrays
• High-fidelity trapped-ion quantum logic using near-field microwaves
• Experimental noise filtering by quantum control
• Robust and resource-efficient microwave near-field entangling ${}^9$Be${}^{+}$ gate
• Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
• Quantum Error Correction with Metastable States of Trapped Ions Using Erasure Conversion
• Single-Spin Spectrum-Analyzer for a Strongly Coupled Environment
• High fidelity state preparation and measurement of ion hyperfine qubits with I > 1/2
• Fast, high-fidelity addressed single-qubit gates using efficient composite pulse sequences
• Randomized Benchmarking using Non-Destructive Readout in a 2D Atom Array
• Ultra-low vibration pulse-tube cryocooler stabilized cryogenic sapphire oscillator with 10^-16 fractional frequency stability
• Robust and fast microwave-driven quantum logic for trapped-ion qubits
• Weak dissipation for high fidelity qubit state preparation and measurement
• Cryogenic ion trap system for high-fidelity near-field microwave-driven quantum logic
• Numerical optimization of amplitude-modulated pulses in microwave-driven entanglement generation
• Individually-addressed quantum gate interactions using dynamical decoupling
• Polarisation-insensitive state preparation for trapped-ion hyperfine qubits

Cited by in corpus (12)

• Transverse Polarization Gradient Entangling Gates for Trapped-Ion Quantum Computation
• Precision Polarization Tuning for Light Shift Mitigation in Trapped-Ion Qubits
• Single-Qubit Gates Beyond the Rotating-Wave Approximation for Strongly Anharmonic Low-Frequency Qubits
• Sampling Groups of Pauli Operators to Enhance Direct Fidelity Estimation
• Compatibility of trapped ions and dielectrics at cryogenic temperatures
• Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors
• Kilometer-Scale Ion-Photon Entanglement with a Metastable ${}^{88}$Sr${}^{+}$ Qubit
• Crosstalk Insensitive Trapped-Ion Entanglement through Coupling Matrix Engineering
• Existence of a robust optimal control process for efficient measurements in a two-qubit system
• Non-invasive mid-circuit measurement and reset on atomic qubits
• Zeeman Degenerate Sideband Cooling in ${}^{176}$Lu${}^{+}$
• Benchmarking non-Clifford gates using only Pauli twirling group