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

2024/12/05 by M. C. Smith, Smith, M. C., A. D. Leu +10 · 5 voices · 14 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena

paper · pdf · doi:10.48550/arxiv.2412.04421

Abstract

We report the achievement of single-qubit gates with sub-part-per-million error rates, in a trapped-ion ⁴³Ca⁺ hyperfine clock qubit. We explore the speed/fidelity trade-off for gate times 4.4≤ t_g≤35~μs, and benchmark a minimum error per Clifford gate of 1.5(4) × 10^-7. Calibration errors are suppressed to < 10^-8, leaving qubit decoherence (T₂≈ 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.

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Discussions

• Whoa this is crazy -- less than ppm single qubit gate errors! Ions have their issues but are just consistently impressive with developments like this arxiv.org/abs/2412.04421 [bsky, 13 points, 1 comments]
• PSA reminder to stop talking about Majorana’s and start talking about how real qubit’s are surpassing the ppm error threshold… arxiv.org/abs/2412.04421 [bsky, 2 points, 0 comments]
• Yes it does, see for instance this paper on the current highest fidelity single qubit gates. The leading source of error is listed as decoherence (with a $T_2$ time of 70 s). One can see where decoher [stackexchange, 1 points]
• Clarendon Laboratory, University of Oxford AND The Center for Quantum Information and Quantum Biology - Osaka University, have announced that they have cracked room temperature Quantum Computing: arxi [bsky, 0 points, 0 comments]
• Check out these trapped-ion 9s! 0.99999985(3) arxiv.org/pdf/2412.04421 [bsky, 0 points, 0 comments]

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