Figure 3: Magnitude of observed ENAQT.

(a) Transport efficiency—the portion of light that makes it to the sink—as a function of wavelength. The minimum efficiency at λ₀=792.5 nm is η=0.636±0.002, slightly less than the theoretical infinite time limit of 2/3. The error bars are s.d. caused by imperfect repeatability in coupling light into the sample and laser power fluctuations. (b) ENAQT—the relative increase in the efficiency over that at λ₀—as a function of the optical bandwidth (top horizontal axis) and corresponding decoherence strength γ (bottom horizontal axis). The red points are obtained by averaging the measured efficiencies over a uniform broadband spectrum with width Δλ and centred at λ₀. The blue line represents the theoretical ENAQT, calculated based on the model in Fig. 1b and containing no free parameters (it is the cross-section of Fig. 1d along the red line segment). The shaded region represents possible ENAQT if Δβ(λ₀) deviates from C(λ₀) by up to 10%.