150 citations · 600 across the 11 of their papers we have counts for
8 papers · 1 filter
A Hidden Markov Model of atomic quantum jump dynamics in an optically probed cavity
S. Gammelmark, W. Alt, T. Kampschulte +2
We analyze the quantum jumps of an atom interacting with a cavity field. The strong atom- field interaction makes the cavity transmission depend on the time dependent atomic state,…
The Fisher information and the quantum Cramer-Rao sensitivity limit of continuous measurements
Søren Gammelmark, Klaus Mølmer
Precision measurements with quantum systems rely on our ability to trace the differences between experimental signals to variations in unknown physical parameters. In this Letter w…
Past quantum states
Søren Gammelmark, Brian Julsgaard, Klaus Mølmer
A density matrix ρ(t) yields probabilistic information about the outcome of measurements on a quantum system. We introduce here the past quantum state, which, at time T, accounts f…
Bayesian parameter inference from continuously monitored quantum systems
Søren Gammelmark, Klaus Mølmer
We review the introduction of likelihood functions and Fisher information in classical estimation theory, and we show how they can be defined in a very similar manner within quantu…
Interacting spins in a cavity: finite size effects and symmetry-breaking dynamics
Søren Gammelmark, Klaus Mølmer
We calculate the ground state and simulate the dynamics of a finite chain of spins with Ising nearest-neighbor interactions and a Dicke collective spin interaction with a single mo…
Phase transitions in an Ising chain interacting with a single mode cavity field
Søren Gammelmark, Klaus Mølmer
We investigate the thermodynamics of a combined Dicke- and Ising-model which exhibits a rich phenomenology arising from the second order and quantum phase transitions from the resp…