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Researchers from the University of Basel and KFUPM propose a noise-robust quantum architecture using antimony-123 donors in silicon to achieve coherence times up to 100 seconds. This spin Kerr-cat encoding leverages quadrupolar nuclear spins to passively suppress dephasing errors at the hardware level, potentially eliminating reliance on extensive post-error correction.
University of Basel, KFUPM Detail Spin Kerr-cat Qubits
University of Basel and KFUPM researchers detail the spin Kerr-cat encoding, a noise-robust approach using antimony-123 donors in silicon, potentially achieving coherence times of 100 seconds.
Z. M. McIntyre and colleagues at the University of Basel report a potential path toward dramatically extending qubit coherence times. The researchers estimate a coherence time of 100 seconds is achievable using a novel qubit encoding, based on the nuclear spins of antimony (^(123)Sb) embedded in silicon. This approach uses the antimony’s quadrupolar nuclei to suppress noise that leads to qubit dephasing. The work also proposes a two-qubit gate design capable of 99% fidelity with a quadrupolar splitting enhancement of approximately four times current measurements. Measurements of antimony-123 (^(123)Sb) nuclear spins in silicon revealed T2* times reaching tens of milliseconds, alongside exceptionally long T1 times exceeding tens of seconds. This work introduces a nuclear-spin qubit encoding designed to extend the dephasing time, T2*, of quantum information stored within…
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