Benchmarking a high-fidelity mixed-species entangling gate

Abstract

We implement a two-qubit logic gate between a ${}^{43}{\mathrm{Ca}}^{+}$ hyperfine qubit and a ${}^{88}{\mathrm{Sr}}^{+}$ Zeeman qubit. For this pair of ion species, the S--P optical transitions are close enough that a single laser of wavelength $402\mathrm{nm}$ can be used to drive the gate, but sufficiently well separated to give good spectral isolation and low photon scattering errors. We characterize the gate by full randomized benchmarking, gate set tomography and Bell state analysis. The latter method gives a fidelity of $99.8(1)\%$, comparable to that of the best same-species gates and consistent with known sources of error.

References in corpus (44)

• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Experimental issues in coherent quantum-state manipulation of trapped atomic ions
• Randomized Benchmarking of Quantum Gates
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• High-fidelity quantum logic gates using trapped-ion hyperfine qubits
• High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• Deterministic delivery of remote entanglement on a quantum network
• High-Fidelity Universal Gate Set for ${}^9$Be${}^{+}$ Ion Qubits
• Circuit Quantum Electrodynamics with a Spin Qubit
• Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography
• High-fidelity readout of trapped-ion qubits
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Strong Coupling of a Single Electron in Silicon to a Microwave Photon
• High-rate, high-fidelity entanglement of qubits across an elementary quantum network
• Fast quantum logic gates with trapped-ion qubits
• Coupling Nitrogen Vacancy Centers in Diamond to Superconducting Flux Qubits
• Characterizing large-scale quantum computers via cycle benchmarking
• Preparation and coherent manipulation of pure quantum states of a single molecular ion
• Sympathetic cooling of ${}^{9}B{e}^{+}$ and ${}^{24}M{g}^{+}$ for quantum logic
• Demonstration of entanglement-by-measurement of solid state qubits
• Errors in trapped-ion quantum gates due to spontaneous photon scattering
• Multi-Element Logic Gates for Trapped-Ion Qubits
• Phase Control of Trapped Ion Quantum Gates
• Quantum gate teleportation between separated qubits in a trapped-ion processor
• High-fidelity trapped-ion quantum logic using near-field microwaves
• Repeated multi-qubit readout and feedback with a mixed-species trapped-ion register
• Randomized Benchmarking of Multi-Qubit Gates
• Coherent Error Suppression in Multi-Qubit Entangling Gates
• Normal modes of trapped ions in the presence of anharmonic trap potentials
• Multi-Species Trapped Ion Node for Quantum Networking
• Robust and resource-efficient microwave near-field entangling ${}^9$Be${}^{+}$ gate
• Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
• Low temperature dynamics and laser-cooling of two-species Coulomb chains for quantum logic
• Robust, self-consistent, closed-form tomography of quantum logic gates on a trapped ion qubit
• BASE - The Baryon Antibaryon Symmetry Experiment
• Direct photonic coupling of a semiconductor quantum dot and a trapped ion
• Minimally complex ion traps as modules for quantum communication and computing
• Memory coherence of a sympathetically cooled trapped-ion qubit
• Dual-Species, Multi-Qubit Logic Primitives for Ca+/Sr+ Trapped-Ion Crystals
• Subspace benchmarking high-fidelity entangling operations with trapped ions
• Probing Qubit Memory Errors at the Part-per-Million Level
• Laser cooling and trapping of Yb from a thermal source

Cited by in corpus (32)

• Noisy intermediate-scale quantum (NISQ) algorithms
• Distributed Quantum Computing across an Optical Network Link
• Noisy intermediate-scale quantum computers
• A quantum network of entangled optical atomic clocks
• Native qudit entanglement in a trapped ion quantum processor
• $\text{omg}$ Blueprint for trapped ion quantum computing with metastable states
• Cavity-enhanced quantum network nodes
• Robust Quantum Memory in a Trapped-Ion Quantum Network Node
• Mid-circuit qubit measurement and rearrangement in a ${}^{171}$Yb atomic array
• Verifiable blind quantum computing with trapped ions and single photons
• The Character of Motional Modes for Entanglement and Sympathetic Cooling of Mixed-Species Trapped Ion Chains
• A Wavelength-Insensitive, Multispecies Entangling Gate for Group-2 Atomic Ions
• Universal Parity Quantum Computing
• High-fidelity indirect readout of trapped-ion hyperfine qubits
• Experimental Bayesian calibration of trapped ion entangling operations
• Isotope-Selective Laser Ablation Ion-Trap Loading of ${}^{137}{\mathrm{Ba}}^{+}$ using a ${\mathrm{BaCl}}_2$ Target
• Benchmarking quantum logic operations relative to thresholds for fault tolerance
• Operational, gauge-free quantum tomography
• Entangling gates for trapped-ion quantum computation and quantum simulation
• Applications of Universal Parity Quantum Computation
• Adaptive projected variational quantum dynamics
• Low-temperature environments for quantum computation and quantum simulation
• Characterizing quantum instruments: from non-demolition measurements to quantum error correction
• High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes
• Self-consistent state and measurement tomography with fewer measurements
• A Comparison of Calcium Sources for Ion-Trap Loading via Laser Ablation
• Experimental realization of direct entangling gates between dual-type qubits
• Fast mixed-species quantum logic gates for trapped-ion quantum networks
• Improving trapped-ion-qubit memories via code-mediated error-channel balancing
• Bichromatic UV detection system for atomically-resolved imaging of ions
• Quantum computing hardware in the cloud: Should a computational chemist care?
• Schrödinger cat states of a macroscopic charged particle co-trapped with an ion