Highly resilient, error-protected quantum gates in a solid-state quantum network node
- URL: http://arxiv.org/abs/2512.05322v1
- Date: Thu, 04 Dec 2025 23:41:05 GMT
- Title: Highly resilient, error-protected quantum gates in a solid-state quantum network node
- Authors: E. Poem, M. I. Cohen, S. Blum, D. Minin, D. Korn, O. Heifler, S. Maayani, A. Hamo, I. Bayn, N. Bar-Gill, M. Tordjman,
- Abstract summary: We develop and experimentally demonstrate error-protected quantum gates in a solid-state quantum network node.<n>We show a record two-qubit error per gate of $1.2 times 10-5$, corresponding to a fidelity of $99.9988%$, far below the thresholds required by surface and color code error correction.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: High-fidelity quantum gates are a cornerstone of any quantum computing and communications architecture. Realizing such control in the presence of realistic errors at the level required for beyond-threshold quantum error correction is a long-standing challenge for all quantum hardware platforms. Here we theoretically develop and experimentally demonstrate error-protected quantum gates in a solid-state quantum network node. Our work combines room-temperature randomized benchmarking with a new class of composite pulses that are simultaneously robust to frequency and amplitude, affecting random and systematic errors. We introduce Power-Unaffected, Doubly-Detuning-Insensitive Gates (PUDDINGs) -- a theoretical framework for constructing conditional gates with immunity to both amplitude and frequency errors. For single-qubit and two-qubit CNOT gate demonstrations in a solid-state nitrogen-vacancy (NV) center in diamond, we systematically measure an improvement in the error per gate up to a factor of 9. By projecting the application of PUDDING to cryogenic temperatures we show a record two-qubit error per gate of $1.2 \times 10^{-5}$, corresponding to a fidelity of $99.9988\%$, far below the thresholds required by surface and color code error correction. These results present viable building blocks for a new class of fault-tolerant quantum networks and represent the first experimental realization of error-protected conditional gates in solid-state systems.
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