120 citations · 624 across the 46 of their papers we have counts for
47 papers
Exceptional point structure and chiral state transfer in a rate-operator-engineered -symmetric Bose-Hubbard dimer
Jaakko Luomala, Federico Settimo, Kimmo Luoma +2
The rate operator quantum jumps (ROQJ) is a general method to unravel a master equation describing the dynamics of an open quantum system into stochastic pure state trajectories. B…
Engineering of Non-Hermitian Trajectories and Phase Structure in an Open Bose-Hubbard Model via Rate Operator Transformations
Jaakko Luomala, Kimmo Luoma, Iiro Vilja +1
Non-Hermitian evolution can be realized through post-selection on stochastic pure-state trajectories arising in continuously monitored open quantum systems. The rate operator forma…
Group-theoretic treatment of strong light-matter coupling with an arbitrary number of excitations
Antti Peltola, Olli Siltanen, Kimmo Luoma +1
Strong light-matter interactions in optical microcavities give rise to hybrid light-matter states known as polaritons. While actively used in modern technologies, theoretical descr…
Schrödinger and Heisenberg non-Markovianity in quantum information tasks
Federico Settimo, Kimmo Luoma, Jyrki Piilo +3
Quantum non-Markovianity has been widely studied and connected to the existence of memory effects in the dynamics of open systems. Surprisingly, working in the Schrödinger or in th…
Revivals of Bell nonlocality require Schrödinger and Heisenberg non-Markovianity
Federico Settimo, Kimmo Luoma, Jyrki Piilo +3
Bell nonlocality is a key resource in quantum information, demonstrating the nonclassicality of quantum theory. Noise, however, is in general detrimental to nonlocality, and can ca…
Vibrationally Induced Resonances in Lasing
Kai Müller, Kimmo Luoma, Christian Schäfer
Optical circuits and light sources, such as lasers, undergo continuous miniaturization. In its extreme, nanolasers might be comprised of only a few molecules confined in plasmonic…
Stochastic unravelings for Heisenberg picture and trace-nonpreserving dynamics
Federico Settimo, Kimmo Luoma, Dariusz Chruściński +3
Stochastic unravelings allow to efficiently simulate open system dynamics, yet their application has traditionally been restricted to master equations that preserve both Hermiticit…
Divisibility of dynamical maps: Schrödinger vs. Heisenberg picture
Federico Settimo, Andrea Smirne, Kimmo Luoma +3
Divisibility of dynamical maps is a central notion in the study of quantum non-Markovianity, providing a natural framework to characterize memory effects via time-local master equa…
Dynamics of Open Quantum Systems with Initial System-Environment Correlations via Stochastic Unravelings
Federico Settimo, Kimmo Luoma, Dariusz Chruściński +3
In standard treatments of open quantum systems, the reduced dynamics is described starting from the assumption that the system and the environment are initially uncorrelated. This…
Impact of light-matter coupling strength on the efficiency of microcavity OLEDs: A unified quantum master equation approach
Olli Siltanen, Kimmo Luoma, Konstantinos S. Daskalakis
Controlling light-matter interactions is emerging as a powerful strategy to enhance the performance of organic light-emitting diodes (OLEDs). By embedding the emissive layer in pla…
Phonon-Induced Effects in Quantum Dot Absorption and Resonance Fluorescence with Hierarchy of Pure States
Sebastian Toivonen, Kimmo Luoma
We investigate a quantum dot (QD) system coupled to a vibrational environment with a super-Ohmic spectral density and weakly to a leaky cavity mode, a model relevant for semiconduc…
Joint qubit observables induced by indirect measurements in cavity QED
Kalle Raikisto, Kimmo Luoma
A fundamental feature of quantum mechanics is that there are observables which can be measured jointly only when some noise is added to them. Their sharp versions are said to be in…
A Hierarchical Approach to Quantum Many-Body Systems in Non-Markovian Environments
Kai Müller, Kimmo Luoma, Christian Schäfer
Quantum many-body systems in cavities combine the rich physics of condensed matter systems or quantum chemistry with strong coupling to the surrounding electromagnetic field. In th…
Enhancing the efficiency of polariton OLEDs in and beyond the single-excitation subspace
Olli Siltanen, Kimmo Luoma, Andrew J. Musser +1
Organic light-emitting diodes (OLEDs) have redefined lighting with their environment-friendliness and flexibility. However, only 25 % of the electronic states of organic molecules…
Generalized Rate Operator Quantum Jumps via Realization-Dependent Transformations
Federico Settimo, Kimmo Luoma, Dariusz Chruściński +3
The dynamics of open quantum systems is often solved by stochastic unravellings where the average over the state vector realizations reproduces the density matrix evolution. We foc…
Linear optical properties of organic microcavity polaritons with non-Markovian Quantum State Diffusion
Timo Leppälä, Ahmed Gaber Abdelmagid, Hassan A. Qureshi +2
Hybridisation of the cavity modes and the excitons to polariton states together with the coupling to the vibrational modes determine the linear optical properties of organic semico…
Identifying the origin of delayed electroluminescence in a polariton organic light-emitting diode
Ahmed Gaber Abdelmagid, Hassan A. Qureshi, Michael A. Papachatzakis +6
Modifying the energy landscape of existing molecular emitters is an attractive challenge with favourable outcomes in chemistry and organic optoelectronic research. It has recently…
Non-Markovian Quantum State Diffusion for Spin Environments
Valentin Link, Kimmo Luoma, Walter T. Strunz
We introduce an exact open system method to describe the dynamics of quantum systems that are strongly coupled to specific types of environments comprising of spins, such as centra…
Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement
Valentin Link, Kai Müller, Rosaria G. Lena +4
An important challenge in non-Markovian open quantum systems is to understand what information we gain from continuous measurement of an output field. For example, atoms in multimo…
Joint measurability in nonequilibrium quantum thermodynamics
Konstantin Beyer, Roope Uola, Kimmo Luoma +1
In this Letter we investigate the concept of quantum work and its measurability from the viewpoint of quantum measurement theory. Very often, quantum work and fluctuation theorems…
Quantum Steering on IBMQ
Lennart Maximilian Seifert, Konstantin Beyer, Kimmo Luoma +1
We use contemporary quantum computers to experimentally investigate quantum steering ofan open quantum system by measurements on its environment. On three IBMQ processors wedisting…
Experimental and theoretical characterization of a non-equilibrium steady state of a periodically driven qubit
Yong-Nan Sun, Kimmo Luoma, Zhao-Di Liu +3
Periodically driven dynamics of open quantum systems is very interesting because typically non-equilibrium steady state is reached, which is characterized by a non-vanishing curren…
Set coherence: basis-independent quantification of quantum coherence
Sébastien Designolle, Roope Uola, Kimmo Luoma +1
The coherence of an individual quantum state can be meaningfully discussed only when referring to a preferred basis. This arbitrariness can however be lifted when considering sets…
How to design quantum-jump trajectories via distinct master equation representations
Dariusz Chruściński, Kimmo Luoma, Jyrki Piilo +1
Every open-system dynamics can be associated to infinitely many stochastic pictures, called unravelings, which have proved to be extremely useful in several contexts, both from the…