Stroboscopic Stabilization of Cat Qubits

• URL: http://arxiv.org/abs/2607.08363v1
• Date: Thu, 09 Jul 2026 11:21:04 GMT
• Title: Stroboscopic Stabilization of Cat Qubits
• Abstract summary: Cat qubits exhibit exponential suppression of bit-flip errors with increasing phase-space separation of the logical states.<n>Existing implementations rely on engineered two-photon dissipation via nonlinear coupling to a lossy environment.<n>We propose a fundamentally different stabilization paradigm based on repeated interactions with an auxiliary two-level system mediated by a quadratic Hamiltonian.
• Score: 39.146761527401424
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Dissipatively stabilized cat qubits provide a promising route toward fault-tolerant quantum computation, exhibiting exponential suppression of bit-flip errors with increasing phase-space separation of the logical states, while incurring only a linear increase in phase-flip errors. Existing implementations rely on engineered two-photon dissipation via nonlinear coupling to a lossy environment, an approach largely confined to superconducting platforms and limited by spurious decay channels and finite dissipation rates. Here, we propose a fundamentally different stabilization paradigm based on repeated interactions with an auxiliary two-level system mediated by a quadratic Hamiltonian, enabling dissipative stabilization without reservoir engineering. Our approach overcomes key limitations of existing schemes and is compatible with a wider class of experimental platforms. Furthermore, it preserves the noise bias and extends to squeezed cat qubits, rendering single-photon loss errors partially correctable.

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