Circuit-based leakage-to-erasure conversion in a neutral atom quantum processor

Abstract

Leakage out of the computational subspace is a major limitation of current state-of-the-art neutral-atom quantum computers and a significant challenge for scalable systems. In a quantum processor with cesium atoms, we demonstrate proof-of-principle circuit-based conversion of leakage errors to erasure errors via Leakage Detection Units (LDUs), which non-destructively map information about the presence or absence of the qubit onto the state of an ancilla. With a standard LDU circuit, we successfully convert leakage errors to erasure errors for all major leakage pathways while preserving the quantum information in the case that no leakage occurred. We benchmark the performance of the LDU using a three-outcome low-loss state detection method and also explore the advantages of three-outcome measurements for LDUs. We find that the LDU detects atom-loss errors with ~93.4% accuracy, limited by technical imperfections of our apparatus. We further compile and execute a SWAP LDU, wherein the roles of the original data atom and ancilla atom are exchanged under the action of the LDU, providing 'free refilling' of atoms in the case of leakage errors. This circuit-based leakage-to-erasure error conversion is a critical component of a neutral-atom quantum processor where the quantum information may significantly outlive the lifetime of any individual atom in the quantum register.

14 pages, 8 figures, published in PRX Quantum

References in corpus (43)

• Logical quantum processor based on reconfigurable atom arrays
• Parallel implementation of high-fidelity multi-qubit gates with neutral atoms
• High-fidelity parallel entangling gates on a neutral atom quantum computer
• High-Fidelity Entanglement and Detection of Alkaline-Earth Rydberg Atoms
• A Race Track Trapped-Ion Quantum Processor
• Entanglement and Tunable Spin-Spin Couplings Between Trapped Ions Using Multiple Transverse Modes
• Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
• Coherence and Raman sideband cooling of a single atom in an optical tweezer
• 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
• Analysis of imperfections in the coherent optical excitation of single atoms to Rydberg states
• Dynamics of single neutral impurity atoms immersed in an ultracold gas
• Parallel Entangling Operations on a Universal Ion Trap Quantum Computer
• Analysis of dephasing mechanisms in a standing wave dipole trap
• Erasure conversion in a high-fidelity Rydberg quantum simulator
• Universal gate operations on nuclear spin qubits in an optical tweezer array of ${}^{171}$Yb atoms
• Removing leakage-induced correlated errors in superconducting quantum error correction
• Multi-qubit gates and Schrödinger cat states in an optical clock
• Coping with qubit leakage in topological codes
• Free-space lossless state-detection of a single trapped atom
• Overcoming leakage in scalable quantum error correction
• A dual-species Rydberg array
• Robust quantum logic in neutral atoms via adiabatic Rydberg dressing
• Robust Mølmer-Sørensen gate for neutral atoms using rapid adiabatic Rydberg dressing
• Mid-circuit measurements on a single species neutral alkali atom quantum processor
• Continuous operation of large-scale atom arrays in optical lattices
• Universal quantum operations and ancilla-based readout for tweezer clocks
• Dispersive optical systems for scalable Raman driving of hyperfine qubits
• Supercharged two-dimensional tweezer array with more than 1000 atomic qubits
• Spin Squeezing by Rydberg Dressing in an Array of Atomic Ensembles
• Deterministic correction of qubit loss
• Benchmarking highly entangled states on a 60-atom analog quantum simulator
• High-fidelity detection of large-scale atom arrays in an optical lattice
• Multi-ensemble metrology by programming local rotations with atom movements
• Narrow-line imaging of single strontium atoms in shallow optical tweezers
• Randomized Benchmarking using Non-Destructive Readout in a 2D Atom Array
• Eliminating Leakage Errors in Hyperfine Qubits
• Fault-tolerant quantum computation using large spin cat-codes
• A scaled local gate controller for optically addressed qubits
• Nondestructive cooling of an atomic quantum register via state-insensitive Rydberg interactions
• High-Fidelity, Low-Loss State Detection of Alkali-Metal Atoms in Optical Tweezer Traps
• Entangling quantum logic gates in neutral atoms via the microwave-driven spin-flip blockade
• Recapture Probability for anti-trapped Rydberg states in optical tweezers

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• A tweezer array with 6100 highly coherent atomic qubits
• A universal neutral-atom quantum computer with individual optical addressing and non-destructive readout
• Quantum Error Correction resilient against Atom Loss
• A high optical access cryogenic system for Rydberg atom arrays with a 3000-second trap lifetime
• Quantum low-density parity-check codes for erasure-biased atomic quantum processors
• Universal gates for a metastable qubit in strontium-88
• Logical qubits with erasure conversion using metastable neutral atoms
• Low-depth quantum error correction via three-qubit gates in Rydberg atom arrays
• Measurement-free quantum error correction optimized for biased noise
• Taming Rydberg Decay with Measurement-based Quantum Computation
• Locating Rydberg Decay Error in SWAP-Leakage Reduction Circuit Protocol