Reply to ´Comment on Can a pulse excitation smaller than kT be detected?´

An amplifier with noise densities i²_amp and u^{2_amp has a pulse-energy sensitivity ≈ i_amp u_amp. This limit applies not only to charge pulses in a capacitor, but also to oscillations in a high-Q-factor resonator operated at an arbitrary temperature T if delay-line filtering is used. Q does not need to be larger than 4kT/R0 i_amp, where R_o = √(L/C).}