Universal gates for a metastable qubit in strontium-88
arXiv:2506.10714 · doi:10.1103/gj3b-5ngl
Abstract
Metastable atomic qubits are a highly promising platform for the realization of quantum computers, owing to their scalability and the possibility of converting leakage errors to erasure errors mid-circuit. Here, we demonstrate and characterize a universal gate set for the metastable fine-structure qubit encoded between the and states in bosonic strontium-88. We find single-qubit gate fidelities of 0.993(1), and two-qubit gate fidelities of 0.9945(6) after correcting for losses during the gate operation. Furthermore, we present a novel state-resolved detection scheme for the two fine-structure states that enables high-fidelity detection of qubit loss. Finally, we leverage the existence of a stable ground state outside the qubit subspace to perform mid-circuit erasure conversion using fast destructive imaging. Our results establish the strontium fine-structure qubit as a promising candidate for near-term error-corrected quantum computers, offering unique scaling perspectives.
15 pages, 16 figures
References in corpus (61)
- Quantum information with Rydberg atoms
- Logical quantum processor based on reconfigurable atom arrays
- Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator
- Programmable quantum simulation of 2D antiferromagnets with hundreds of Rydberg atoms
- Quantum computing with atomic qubits and Rydberg interactions: Progress and challenges
- Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
- High-fidelity parallel entangling gates on a neutral atom quantum computer
- Quantum computing with neutral atoms
- Spin and Charge Resolved Quantum Gas Microscopy of Antiferromagnetic Order in Hubbard Chains
- High-Fidelity Entanglement and Detection of Alkaline-Earth Rydberg Atoms
- Quantum simulation and computing with Rydberg-interacting qubits
- Exponential suppression of bit-flips in a qubit encoded in an oscillator
- High-fidelity gates with mid-circuit erasure conversion in a metastable neutral atom qubit
- Erasure conversion for fault-tolerant quantum computing in alkaline earth Rydberg atom arrays
- Ultrahigh Error Threshold for Surface Codes with Biased Noise
- Microscopic control and detection of ultracold strontium in optical-tweezer arrays
- Gate Set Tomography
- Seconds-scale coherence in a tweezer-array optical clock
- 2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays
- Erasure conversion in a high-fidelity Rydberg quantum simulator
- Assembly and coherent control of a register of nuclear spin qubits
- Spin-resolved single-atom imaging of Li in free space
- Fault-tolerant thresholds for the surface code in excess of 5% under biased noise
- Trapped arrays of alkaline earth Rydberg atoms in optical tweezers
- Multi-qubit gates and Schrödinger cat states in an optical clock
- A tweezer array with 6100 highly coherent atomic qubits
- Free-space lossless state-detection of a single trapped atom
- Robust Bilayer Charge-Pumping for Spin- and Density-Resolved Quantum Gas Microscopy
- Parallel low-loss measurement of multiple atomic qubits
- High Fidelity Single-qubit Gates of a Single Neutral Atom in the Magic-Intensity Optical Dipole Trap
- Quantum Error Correction with Metastable States of Trapped Ions Using Erasure Conversion
- Mid-circuit qubit measurement and rearrangement in a Yb atomic array
- Erasure qubits: Overcoming the limit in superconducting circuits
- High threshold codes for neutral atom qubits with biased erasure errors
- Continuous operation of large-scale atom arrays in optical lattices
- Universal quantum operations and ancilla-based readout for tweezer clocks
- Fast non-destructive parallel readout of neutral atom registers in optical potentials
- Supercharged two-dimensional tweezer array with more than 1000 atomic qubits
- Benchmarking and fidelity response theory of high-fidelity Rydberg entangling gates
- Probing quantum processor performance with pyGSTi
- Nondestructive Fluorescent State Detection of Single Neutral Atom Qubits
- Stern-Gerlach detection of neutral atom qubits in a state dependent optical lattice
- Demonstrating a long-coherence dual-rail erasure qubit using tunable transmons
- High-fidelity detection of large-scale atom arrays in an optical lattice
- Rearrangement of single atoms in a 2000-site optical tweezers array at cryogenic temperatures
- A universal neutral-atom quantum computer with individual optical addressing and non-destructive readout
- Dicke superradiance in ordered arrays of multilevel atoms
- Coherent Control of the Fine-Structure Qubit in a Single Alkaline-Earth Atom
- Reservoir spectroscopy of 5s5p P - 5sd D transitions in strontium
- Tailored XZZX codes for biased noise
- Randomized Benchmarking using Non-Destructive Readout in a 2D Atom Array
- Fast single atom imaging for optical lattice arrays
- Fine-Structure Qubit Encoded in Metastable Strontium Trapped in an Optical Lattice
- AI-Enabled Rapid Assembly of Thousands of Defect-Free Neutral Atom Arrays with Constant-time-overhead
- Circuit-based leakage-to-erasure conversion in a neutral atom quantum processor
- Quantum Error Correction resilient against Atom Loss
- Realization of a fast triple-magic all-optical qutrit in strontium-88
- A High-Power Clock Laser Spectrally Tailored for High-Fidelity Quantum State Engineering
- Measurement and feed-forward correction of the fast phase noise of lasers
- Erasure conversion in Majorana qubits via local quasiparticle detection
- Enhancing optical lattice clock coherence times with erasure conversion