Squeezed-slit Bohr-Einstein Interferometer

• URL: http://arxiv.org/abs/2605.28038v1
• Date: Wed, 27 May 2026 06:42:13 GMT
• Title: Squeezed-slit Bohr-Einstein Interferometer
• Abstract summary: Einstein-Bohr recoiling-slit gedankenexperiment has long been constrained by the zero-point fluctuations of the atomic slit.<n>Here we transcend this fundamental boundary through active quantum state engineering of a single-atom slit.
• Score: 7.586264858704614
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Einstein-Bohr recoiling-slit gedankenexperiment, a cornerstone of quantum complementarity, has long been constrained by the zero-point fluctuations of the atomic slit -- the spatial Standard Quantum Limit (SQL). Here we transcend this fundamental boundary through active quantum state engineering of a single-atom slit. By implementing a non-adiabatic quench-evolve-quench protocol, we prepare the atomic motion in a squeezed state, dynamically redistributing phase-space uncertainty to suppress which-path information and restore high-visibility interference beyond the static vacuum limit. We report an intrinsic visibility of $0.938_{-0.008}^{+0.004}$, violating the SQL ($0.819$) by over 10 standard deviations, corresponding to $7.6(2)$ dB of effective squeezing. Our work reveals Kerr-induced non-Gaussian dynamics and reinterprets the traditional interferometer as a powerful tool for continuous-variable Wigner tomography, bridging the gap between quantum foundations and advanced metrology.

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