Fig. 1: Schematic realization of a quantum thermometer.
From: Enhanced precision bound of low-temperature quantum thermometry via dynamical control
a Schematic realization of a dynamically controlled quantum thermometer by a motional wavepacket of a state of a cavity, or an ion/atom trapped in an optical lattice potential. The frequency of the trap is periodically varied (black arrow) by modulating the length of the cavity, or the amplitudes of the lasers forming the trap. The wavepacket is in contact with a phonon bath, and relaxes to the corresponding thermal steady-state at long times. b Same, for a spin-chain bath coupled to a two-level system whose resonant frequency is periodically modulated.
