222 citations · 806 across the 20 of their papers we have counts for
13 papers · 1 filter
Supermartingales in Quantum Resources Theories: Where do quantum resources go when you're watching?
Katarzyna Macieszczak, Robert L. Jack
We establish a connection between quantum resource theory and probability theory, under repeated application of free operations. We show that strong monotonicity of a resource meas…
Weak unitary symmetries of open quantum dynamics: beyond quantum master equations
Calum A. Brown, Robert L. Jack, Katarzyna Macieszczak
We consider Markovian open quantum dynamics with weak unitary symmetries. Starting from the quantum master equation for the system alone, it is known that the joint dynamics of the…
Gauge freedoms in unravelled quantum dynamics: When do different continuous measurements yield identical quantum trajectories?
Calum A. Brown, Katarzyna Macieszczak, Robert L. Jack
Quantum trajectories of a Markovian open quantum system arise from the back-action of measurements performed in the environment with which the system interacts. In this work, we co…
Unravelling Metastable Markovian Open Quantum Systems
Calum A. Brown, Katarzyna Macieszczak, Robert L. Jack
We analyse the dynamics of metastable Markovian open quantum systems by unravelling their average dynamics into stochastic trajectories. We use quantum reset processes as examples…
Operational approach to metastability
Katarzyna Macieszczak
In this work, we introduce an information-theoretic approach for considering changes in dynamics of finitely dimensional open quantum systems governed by master equations. This exp…
Quantum jump Monte Carlo simplified: Abelian symmetries
Katarzyna Macieszczak, Dominic C. Rose
We consider Markovian dynamics of a finitely dimensional open quantum system featuring a weak unitary symmetry, i.e., when the action of a unitary symmetry on the space of density…
Dissipative quantum state preparation and metastability in two-photon micromasers
Andreas Kouzelis, Katarzyna Macieszczak, Jiří Minář +1
We study the preparation of coherent quantum states in a two-photon micromaser for applications in quantum metrology. While this setting can be in principle realized in a host of p…
Non-equilibrium absorbing state phase transitions in discrete-time quantum dynamics
I. Lesanovsky, Katarzyna Macieszczak, Juan P. Garrahan
We introduce a discrete-time quantum dynamics on a two-dimensional lattice that describes the evolution of a -dimensional spin system. The underlying quantum map is constructe…
Dynamical phase transitions as a resource for quantum enhanced metrology
Katarzyna Macieszczak, Madalin Guta, Igor Lesanovsky +1
We consider the general problem of estimating an unknown control parameter of an open quantum system. We establish a direct relation between the evolution of both system and enviro…
The Zeno limit in frequency estimation with non-Markovian environments
Katarzyna Macieszczak
We prove the Zeno limit of the quantum Fisher information for frequency estimation with a general initial state of two-level atoms in the presence of local non-Markov…
Upper bounds on the quantum Fisher Information in the presence of general dephasing
Katarzyna Macieszczak
We derive upper bounds on the quantum Fisher information in interferometry with subsystems, e.g. two-level atoms or Gaussian modes, in the presence of arbitrarily correlated Ga…
Quantum Fisher Information: Variational principle and simple iterative algorithm for its efficient computation
Katarzyna Macieszczak
We derive a new variational principle for the quantum Fisher information leading to a simple iterative alternating algorithm, the convergence of which is proved. The case of a fixe…
Bayesian quantum frequency estimation in presence of collective dephasing
Katarzyna Macieszczak, Martin Fraas, Rafal Demkowicz-Dobrzanski
We advocate a Bayesian approach to optimal quantum frequency estimation - an important issue for future quantum enhanced atomic clock operation. The approach provides a clear insig…