Universal gates for a metastable qubit in strontium-88

• URL: http://arxiv.org/abs/2506.10714v2
• Date: Fri, 13 Jun 2025 15:24:37 GMT
• Title: Universal gates for a metastable qubit in strontium-88
• Authors: Renhao Tao, Ohad Lib, Flavien Gyger, Hendrik Timme, Maximilian Ammenwerth, Immanuel Bloch, Johannes Zeiher,
• Abstract summary: We characterize a universal gate set for the metastable fine-structure qubit in bosonic strontium-88.<n>We find single-qubit gate fidelities of 0.993 and two-qubit fidelities of 0.9945(6) after correcting for losses.<n>Our results establish the strontium fine-structure qubit as a promising candidate for near-term error-corrected quantum computers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $^3\text{P}_0$ and $^3\text{P}_2$ 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.

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