On the role of chirping in pulsed single photon spectroscopy
arxiv(2024)
摘要
We investigate the precision of estimating the interaction strength between a
two-level system (TLS) and a single-photon pulse when the latter is subject to
chirping. We consider linear, quadratic, and sinusoidal temporal phases applied
to Gaussian and exponential temporal profiles. At the asymptotic time, when the
TLS has fully decayed to its ground state, the fundamental precision depends
solely on the magnitude of its spectral amplitude. For quadratically
phase-modulated Gaussian pulses, this is entirely determined by the spectral
bandwidth. We provide expressions for evaluating the fundamental precision for
general temporal profiles and phase modulations. Finally, we show that
experimentally feasible mode-resolved measurements are optimal, or close to it,
for chirped, pulsed single photon spectroscopy.
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