Publications (41)
Cold collisions in dissipative optical lattices
J. Piilo, K. -A. Suominen
In the past, light-assisted cold collisions between laser cooled atoms have been widely studied in magneto-optical atom traps (MOTs). We describe here theoretical studies of dynami…
Initial correlations in open system's dynamics: The Jaynes-Cummings model
A. Smirne, H. -P. Breuer, J. Piilo +1
Employing the trace distance as a measure for the distinguishability of quantum states, we study the influence of initial correlations on the dynamics of open systems. We concentra…
Open system dynamics with non-Markovian quantum jumps
J. Piilo, K. Harkonen, S. Maniscalco +1
We discuss in detail how non-Markovian open system dynamics can be described in terms of quantum jumps [J. Piilo et al., Phys. Rev. Lett. 100, 180402 (2008)]. Our results demonstra…
Cold collisions in strong laser fields: partial wave analysis of magnesium collisions
J. Piilo, E. Lundh, K. -A. Suominen
We have developed Monte Carlo wave function simulation schemes to study cold collisions between magnesium atoms in a strong red-detuned laser field. In order to address the strong-…
Non-Markovian quantum dynamics: What is it good for?
C. -F. Li, G. -C. Guo, J. Piilo
Recent developments in practical quantum engineering and control techniques have allowed significant developments for experimental studies of open quantum systems and decoherence e…
Remote polarization entanglement generation by local dephasing and frequency upconversion
S. Hamedani Raja, G. Karpat, E. -M. Laine +4
We introduce a scheme for remote entanglement generation for the photon polarization. The technique is based on transferring the initial frequency correlations to specific polariza…
Atomic collision dynamics in optical lattices
J. Piilo, K. -A. Suominen, K. Berg-Sorensen
We simulate collisions between two atoms, which move in an optical lattice under the dipole-dipole interaction. The model describes simultaneously the two basic dynamical processes…
Role of correlations in the thermalization of quantum systems
A. Smirne, E. -M. Laine, H. -P. Breuer +2
We investigate the equilibration and thermalization properties of quantum systems interacting with a finite dimensional environment. By exploiting the concept of time averaged stat…
Cold collisions between atoms in optical lattices
J. Piilo, K. -A. Suominen, K. Berg-Sorensen
We have simulated binary collisions between atoms in optical lattices during Sisyphus cooling. Our Monte Carlo Wave Function simulations show that the collisions selectively accele…
Non-Markovian quantum jumps
J. Piilo, S. Maniscalco, K. Harkonen +1
Open quantum systems that interact with structured reservoirs exhibit non-Markovian dynamics. We present a quantum jump method for treating the dynamics of such systems. This appro…
Locality and universality of quantum memory effects
B. -H. Liu, S. WiÃmann, X. -M. Hu +7
Recently, a series of different measures quantifying memory effects in the quantum dynamics of open systems has been proposed. Here, we derive a mathematical representation for the…
Quantum theory of heating of a single trapped ion
F. Intravaia, S. Maniscalco, J. Piilo +1
The heating of trapped ions due to the interaction with a {\it quantized environment} is studied {\it without performing the Born-Markov approximation}. A generalized master equati…
Frozen discord in non-Markovian dephasing channels
L. Mazzola, J. Piilo, S. Maniscalco
We investigate the dynamics of quantum and classical correlations in a system of two qubits under local colored-noise dephasing channels. The time evolution of a single qubit inter…
Misbelief and misunderstandings on the non--Markovian dynamics of a damped harmonic oscillator
S. Maniscalco, F. Intravaia, J. Piilo +1
We use the exact solution for the damped harmonic oscillator to discuss some relevant aspects of its open dynamics often mislead or misunderstood. We compare two different approxim…
Measurement-induced manipulation of the quantum-classical border
S. Maniscalco, J. Piilo, K. -A. Suominen
We demonstrate the possibility of controlling the border between the quantum and the classical world by performing nonselective measurements on quantum systems. We consider a quant…
Distributing Memory Effects in an Open Two-Qubit System
O. Siltanen, T. Kuusela, J. Piilo
We introduce a method to distribute memory effects among different subspaces of an open two-qubit system's state space. Within the linear optical framework, our system of interest…
Phenomenological memory-kernel master equations and time-dependent Markovian processes
L. Mazzola, E. -M. Laine, H. -P. Breuer +2
Do phenomenological master equations with memory kernel always describe a non-Markovian quantum dynamics characterized by reverse flow of information? Is the integration over the p…
Divisibility of quantum dynamical maps and collision models
S. N. Filippov, J. Piilo, S. Maniscalco +1
Divisibility of dynamical maps is visualized by trajectories in the parameter space and analyzed within the framework of collision models. We introduce ultimate completely positive…
Scaling of non-Markovian Monte Carlo wave-function methods
J. Piilo, S. Maniscalco, A. Messina +1
We demonstrate a scaling method for non-Markovian Monte Carlo wave-function simulations used to study open quantum systems weakly coupled to their environments. We derive a scaling…
Lindblad and non--Lindblad type dynamics of a quantum Brownian particle
S. Maniscalco, J. Piilo, F. Intravaia +2
The dynamics of a typical open quantum system, namely a quantum Brownian particle in a harmonic potential, is studied focussing on its non-Markovian regime. Both an analytic approa…
Optical shielding of cold collisions in blue-detuned near-resonant optical lattices
J. Piilo, K. -A. Suominen
We report Monte Carlo wave function simulation results for two colliding atoms in a blue-detuned near-resonant optical lattice. Our results show that complete optical…
Cavity losses for the dissipative Jaynes-Cummings Hamiltonian beyond Rotating Wave Approximation
M. Scala, B. Militello, A. Messina +3
A microscopic derivation of the master equation for the Jaynes-Cummings model with cavity losses is given, taking into account the terms in the dissipator which vary with frequenci…
Non-Markovian quantum dynamics: What does it mean?
C. -F. Li, G. -C. Guo, J. Piilo
During the last ten years, the studies on non-Markovian open system dynamics has become increasingly popular and having contributions from diverse set of research communities. This…
Pseudomodes as an effective description of memory: Non-Markovian dynamics of two-state systems in structured reservoirs
L. Mazzola, S. Maniscalco, J. Piilo +2
We investigate the non-Markovian dynamics of two-state systems in structured reservoirs. We establish a connection between two theoretical quantum approaches, the pseudomodes [B. M…
Microscopic derivation of the Jaynes-Cummings model with cavity losses
M. Scala, B. Militello, A. Messina +2
In this paper we provide a microscopic derivation of the master equation for the Jaynes-Cummings model with cavity losses. We single out both the differences with the phenomenologi…
Generation of entanglement density within a reservoir
C. Lazarou, B. M. Garraway, J. Piilo +1
We study a single two-level atom interacting with a reservoir of modes defined by its reservoir structure function. Within this framework we are able to define a density of entangl…
Sudden death and sudden birth of entanglement in common structured reservoirs
L. Mazzola, S. Maniscalco, J. Piilo +2
We study the exact entanglement dynamics of two qubits in a common structured reservoir. We demonstrate that, for certain classes of entangled states, entanglement sudden death occ…
Exact dynamics of entanglement and entropy in structured environments
L. Mazzola, S. Maniscalco, J. Piilo +1
We study the exact entanglement dynamics of two qubits interacting with a common zero-temperature non-Markovian reservoir. We consider the two qubits initially prepared in Bell-lik…
Interferometric Approach to Open Quantum Systems and Non-Markovian Dynamics
O. Siltanen, T. Kuusela, J. Piilo
We combine the dynamics of open quantum systems with interferometry and interference introducing the concept of open system interferometer. By considering a single photon in a Mach…
Transient dynamics of linear quantum amplifiers
S. Maniscalco, J. Piilo, N. Vitanov +1
The transient dynamics of a quantum linear amplifier during the transition from damping to amplification regime is studied. The master equation for the quantized mode of the field…
Off-resonant entanglement generation in a lossy cavity
F. Francica, S. Maniscalco, J. Piilo +2
We provide an exact and complete characterization of the entanglement dynamics of two qubits coupled to a common structured reservoir at zero temperature. We derive the conditions…
Radiative collisional heating at the Doppler limit for laser-cooled magnesium atoms
J. Piilo, E. Lundh, K. -A. Suominen
We report Monte Carlo wave function simulation results on cold collisions between magnesium atoms in a strong red-detuned laser field. This is the normal situation e.g. in magneto-…
Quantum Brownian motion for periodic coupling to an Ohmic bath
J. Piilo, S. Maniscalco, K. -A. Suominen
We show theoretically how the periodic coupling between an engineered reservoir and a quantum Brownian particle leads to the formation of a dynamical steady state which is characte…
Simulating quantum Brownian motion with single trapped ions
S. Maniscalco, J. Piilo, F. Intravaia +2
We study the open system dynamics of a harmonic oscillator coupled with an artificially engineered reservoir. We single out the reservoir and system variables governing the passage…
Non-Markovian dynamics of cavity losses
M. Scala, B. Militello, A. Messina +3
We provide a microscopic derivation for the non-Markovian master equation for an atom-cavity system with cavity losses and show that they can induce population trapping in the atom…
Environment-dependent dissipation in quantum Brownian motion
J. Paavola, J. Piilo, K. -A. Suominen +1
The dissipative dynamics of a quantum Brownian particle is studied for different types of environment. We derive analytic results for the time evolution of the mean energy of the s…
Sudden transition between classical and quantum decoherence
L. Mazzola, J. Piilo, S. Maniscalco
We study the dynamics of quantum and classical correlations in the presence of nondissipative decoherence. We discover a class of initial states for which the quantum correlations,…
Local in time master equations with memory effects: Applicability and interpretation
E. -M. Laine, K. Luoma, J. Piilo
Non-Markovian local in time master equations give a relatively simple way to describe the dynamics of open quantum systems with memory effects. Despite their simple form, there are…
Entanglement trapping in a non-stationary structured reservoir
C. Lazarou, K. Luoma, S. Maniscalco +2
We study a single two-level atom interacting with a reservoir of modes defined by a reservoir structure function with a frequency gap. Using the pseudomodes technique, we derive th…
Population trapping due to cavity losses
M. Scala, B. Militello, A. Messina +3
In population trapping the occupation of a decaying quantum level keeps a constant non-zero value. We show that an atom-cavity system interacting with an environment characterized…
Counterintuitive transitions between crossing energy levels
A. A. Rangelov, J. Piilo, N. V. Vitanov
We calculate analytically the probabilities for intuitive and counterintuitive transitions in a three-state system, in which two parallel energies are crossed by a third, tilted en…