The Whisper Faded: A Quantum Trick Bypasses a Fundamental Limit ⚡ экспресс
In the Einstein–Bohr thought experiment, the atomic slit jitters from quantum fluctuations, blurring the interference pattern—that’s the standard quantum limit. Physicists have beaten it for the first time by actively steering the state of a single atom serving as the slit. Using a rapid ‘quench’ protocol (nonadiabatic quench-evolve-quench), they prepared a squeezed state: uncertainty was redistributed to erase which-path information. Interference bounced back with a visibility of 0.938, outperforming the vacuum limit by 7.6 dB. This result turns the interferometer into a quantum-state tomography tool, linking fundamental physics and high-precision measurement.
Even at absolute rest, atoms emit a faint noise — unavoidable quantum jitter. In the debates between Einstein and Bohr, this noise, like an unceasing whisper, blurs the interference fringes from an atomic slit. Overcoming this limit was considered impossible.
First, the atom was deliberately excited with optical tweezers, then a special protocol squeezed its vibrations. Information about the trajectory was erased, and the fringes achieved a contrast of 0.938 — 10 standard deviations above the previous limit (0.819). The whisper nearly vanished, and sharpness soared. This is how ultra-precise quantum sensors are born.
🎯 The squeezing effect here reaches 7.6 decibels — roughly the volume difference between a normal conversation and a whisper in a library.