قطة شرودنغر بحجم كف اليد سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2601.09672

The generation of non-Gaussian quantum states is a key requirement for universal continuous-variable quantum information processing. We report the experimental generation of large-amplitude squeezed coherent-state superpositions (squeezed cat states) on free-space optical pulses, reaching an amplitude of $$\alpha = 2.47$$, which, to our knowledge, exceeds all previously reported values. Our protocol relies on the controlled mixing of the Fock states $$|1\rangle$$ and $$|2\rangle$$ through a tunable beam splitter, followed by heralding via homodyne detection. The resulting state displays three well-resolved negative regions in its Wigner function and achieves a fidelity of $$0.53$$ with the target state $$\propto \hat{S}(z)(|\alpha\rangle - |-\alpha\rangle)$$, with $$\alpha = 2.47$$ and squeezing parameter $$z = 0.56$$. These results constitute a significant milestone for temporal breeding protocols and for the iterative generation of optical GKP states, opening new perspectives for scalable and fault-tolerant photonic quantum architectures.