61 citations · 389 across the 27 of their papers we have counts for
4 papers · 1 filter
Squeezing by Critical Speeding-up: Applications in Quantum Metrology
Karol Gietka
We present an alternative protocol allowing for the preparation of critical states that instead of suffering from the critical slowing-down benefits from the critical speeding-up.…
Inverted harmonic oscillator dynamics of the nonequilibrium phase transition in the Dicke model
Karol Gietka, Thomas Busch
We show how the dynamics of the Dicke model after a quench from the ground-state configuration of the normal phase into the superradiant phase can be described for a limited time b…
Understanding and Improving Critical Metrology. Quenching Superradiant Light-Matter Systems Beyond the Critical Point
Karol Gietka, Lewis Ruks, Thomas Busch
We carefully examine critical metrology and present an improved critical quantum metrology protocol which relies on quenching a system exhibiting a superradiant quantum phase trans…
Adiabatic critical quantum metrology cannot reach the Heisenberg limit even when shortcuts to adiabaticity are applied
Karol Gietka, Friederike Metz, Tim Keller +1
We show that the quantum Fisher information attained in an adiabatic approach to critical quantum metrology cannot lead to the Heisenberg limit of precision and therefore regular q…