- Dynamics and characterization of quantum memory, coherence and correlations in open quantum systems
- Characterization of entanglement and correlations in composite systems of indistinguishable particles
- Quantum state engineering and entanglement generation
- Experimental proposals
Quantum entanglement of multipartite systems is important both from the fundamental point of view (EPR paradox, nonlocality and related arguments) and from the applicative point of view (quantum computation and information processing). It plays an important role in microscopic physical systems like atoms, microcavities, nanostructures, superconducting qubits, quantum dots, photons, which can be the elementary building blocks of quantum computers.
Our research activity covers in particular the following topics [ see publications for details] :
i) Quantum state engineering and measurement of non-classical field states in cavity QED and applications to quantum information processing.
ii) Generation, measurement and dynamics of entanglement in spatially separated systems, considering also the interaction with the environment. This part also concerns the dynamics of nonlocal quantum correlations between space-like separated systems, exploiting suitable Bell inequalities. Different quantum and classical environments are considered. An important research line regarding entanglement dynamics is the condition where the environment is classical, where we have supplied contributions about the interpretation of peculiar time behaviors.
iii) Dynamics and characterization of quantum memory (non-Markovianity), quantum coherence and correlations other than entanglement in composite quantum systems under different environmental conditions.
iv) Description of systems of identical particles and their quantum entanglement. We have proposed a new non-standard approach to treat indistinguishable particles which allows us to assess the entanglement properties contained in such systems. This line of research aims at settling a long-standing debate on what entanglement of identical particles is and whether it can be exploited for quantum information processing.
v) We study applications to solid-state physics (with Josephson qubits and quantum dots), nuclear magnetic resonance (with nuclear spins) and quantum optics, with polarized photons in waveguides. We analyze and device the feasibility of our studies, collaborating with experimental groups, taking into account the current state-of-art of the experimental technologies, the typical experimental values of the parameters and the errors involved in the studied systems.