2025/09/03 by Pratyush Anand, Anand, Pratyush, Louis Follet +5
Computer Science · Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #Emerging Technologies (cs.ET) #FOS: Computer and information sciences #FOS: Physical sciences #Information Theory (cs.IT) #Mechanical and Optical Resonators #Quantum Information and Cryptography #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2509.02992
openalex publication_date 2025/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Atom-like emitters in solids are promising platforms for quantum sensing and information processing, but inhomogeneities in the emitter fine structure complicate quantum control. We present a framework that leverages this diversity to reduce the resources for generating optically heralded spin cluster states across Nq emitters from the conventional order O(Nq) to O(1) in ensembles of Nq ∼ 10-100. An optimized pulse sequence simultaneously corrects pulse-length and detuning errors, achieving single-qubit gate fidelities exceeding 99.99% for errors (normalized relative to the Rabi drive strength) up to 0.3, while maintaining fidelities above 99% for errors as large as 0.4. Applied as a Carr-Purcell-Meiboom-Gill (CPMG) dynamical decoupling protocol to the dominant noise spectrum of silicon-vacancy centers in diamond, it enhances ensemble coherence times by over 7× compared to interleaved bang-bang based CPMG. For state-of-the-art dilution refrigerators, global resonant optimal decoupling across Nq spins sharply reduces heating, addressing the trade-off between the spin coherence and scaling to Nq ≫ 1. We further introduce a modified single-photon entanglement protocol with an efficient algorithm for deterministic entanglement compilation. Depending on the decoupling time window, our method yields order O(102-104) more entanglement links than bang-bang sequences, with theoretical guarantees of order Ω(Nq) unique links, improvable by control tuning. Together, these techniques provide scalable tools - including global control, phase denoising, remote entanglement, and compilation - for robust quantum computing architectures with heterogeneous spin ensembles.