A unified optical platform for non-Gaussian and fault-tolerant Gottesman-Kitaev-Preskill states

• URL: http://arxiv.org/abs/2512.02607v1
• Date: Tue, 02 Dec 2025 10:12:14 GMT
• Title: A unified optical platform for non-Gaussian and fault-tolerant Gottesman-Kitaev-Preskill states
• Authors: Ozlem Erkilic, Aritra Das, Biveen Shajilal, Ping Koy Lam, Timothy C. Ralph, Syed M. Assad,
• Abstract summary: Non-Gaussian states of light enable secure quantum communication, fault-tolerant quantum computation, and precision sensing beyond classical limits.<n>Here we introduce a unified optical framework that removes this constraint, using only Gaussian inputs, optical parametric amplification, and heralded photon detection.<n>Within a single architecture, we demonstrate the generation of photon-added squeezed states with near unit fidelity, cubic-phase-like states with strong non-linearities and fidelities above 98.5%, and squeezed-cat states exceeding 99% fidelity.
• Score: 2.4013793000097103
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum technologies, encompassing communication, computation, and metrology, rely on the generation and control of non-Gaussian states of light. These states enable secure quantum communication, fault-tolerant quantum computation, and precision sensing beyond classical limits, yet their practical realisation remains a major challenge due to reliance on high-photon-number Fock states or strong non-linearities. Here we introduce a unified optical framework that removes this constraint, using only Gaussian inputs, optical parametric amplification, and heralded photon detection. Within a single architecture, we demonstrate the generation of photon-added squeezed states with near unit fidelity, cubic-phase-like states with strong non-linearities and fidelities above 98.5%, and squeezed-cat states exceeding 99% fidelity that can be iteratively bred into GKP grid states surpassing the 9.75 dB fault-tolerance threshold. Operating entirely below 3 dB of input squeezing, the approach provides a scalable, experimentally accessible platform that unites the state resources required for quantum communication, metrology, and computation within one coherent optical framework.

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