Parameter estimation with one- and two-time measurements on the emission field of the boundary time crystal

Many-body quantum systems can exhibit collective effects that enhance the sensitivity of parameter estimation protocols. An example is provided by resonantly driven two-level atoms subject to collective dissipation, which can display a transition between a stationary phase and a time-crystal one. Previous work has shown that the light emitted in the time-crystal phase can be harnessed for parameter estimation using continuous monitoring protocols, such as photon counting or homodyne detection, which under ideal conditions yield a quadratic enhancement of sensitivity with the number of particles. In this work, we explore what is the minimal information about the emission field that needs to be accessed in order to resolve collective effects and exploit them for parameter estimation. We show that, for short probing times, a single-time measurement of the emission field already captures the collective behavior emerging at the nonequilibrium transition. In contrast, within the time-crystal phase, exploiting collective effects requires at least two-time measurements. To this end, we introduce a family of correlated intensity measurements that extract the relevant information and can be implemented using an interferometric setup. While the ultimate sensitivity bound remains size independent, as recently established within the framework of noisy quantum metrology, our analysis shows that these protocols utilize collective effects to yield a transient increase in sensitivity with particle number.

💡 Research Summary

The paper investigates how much of the emitted light from a boundary time crystal (BTC) needs to be accessed in order to exploit collective effects for parameter estimation, specifically the estimation of small variations in the driving strength ω. The authors consider an ensemble of N two‑level atoms described by a Markovian master equation with collective dissipation (rate Γ) and a resonant drive (frequency ω). The system exhibits a nonequilibrium transition at the critical drive ωc = NΓ/2: for ω < ωc the dynamics relaxes quickly to a stationary state, while for ω > ωc the system displays under‑damped oscillations that, in the thermodynamic limit, become non‑decaying and define a time‑crystal phase.

To analyse the information contained in the emitted field, the authors adopt a discrete‑time input‑output formalism. The continuous output mode a(t) is coarse‑grained into time‑bin bosonic modes b