Fig. 2: Quantum-boosted electron number statistics and energy spectra.
From: Nonlinear atomic tunnelling boosted by bright squeezed vacuum
a, Experimental electron number distributions from ionization driven by coherent (blue circles) and BSV (orange squares) light. The solid lines are the corresponding fits using Poisson distribution (blue) and QADK theory (orange). The slight discrepancy in the tail of the coherent light results compared with ideal Poisson distribution stems from low-count statistical fluctuations. b, Electron kinetic energy spectra produced by elliptically polarized coherent (blue circles) and BSV (orange squares) light. The solid lines are simulated by semiclassical ADK (blue) and QADK (orange) theories. The matched peak position (magenta arrow) confirms equal effective intensities, whereas the extended high-energy tail under BSV directly reflects its amplitude-stretched quantum fluctuations. The striated structure is an artefact of limited counting statistics, common in discrete-event detection experiments3,39. arb.u., arbitrary units.
