Title: Three new ideas about quantum reservoir engineering (and their applications to practically everything)
Abstract:
The coherent control of quantum system is the central ingredient to all new sub-branches of quantum physics,
from quantum thermodynamics to quantum technologies, from quantum biology to relativistic quantum information.
It is nowadays an established fact that the persistence of quantum coherences is not incompatible with the
presence of a surrounding environment. Environment induced decoherence was indeed initially accused to be the
major enemy of quantum technologies. Subsequently, however, it became clear that loss of quantumness does
depend crucially on the properties of the environment. Certain types of environment allow not only for the
preservation of quantum properties but also for their creation. Within this framework, quantum reservoir engineering
techniques where conceived. Contrarily to what one may believe at first sight, indeed, in most physical scenarios
it is possible to have access to a limited number of control parameters regulating the properties of the environment.
In this way, one can in turn control and enhance the persistence of quantum properties, e.g., to extend the
life time of quantum devices.
In my talk I will present three new ideas on reservoir engineering for quantum control. All of them are based on the
exploitation of memory effects characterising the open quantum system dynamics. The first idea is the
reservoir-induced control of the uncertainty associated to lack of knowledge of possible measurement outcomes,
quantified by entropic uncertainty relations [1]. The second idea is the exploration of the interplay between memory
effects and the action of dynamical decoupling pulses to enhance quantum coherence [2]. The third idea is the use of
dynamical decoupling as a tool for inducing memory effects and, in particular, for improving the phenomenon of
time-invariant discord, i.e. the freezing of quantum correlations in presence of noise [3].
References:
[1] G Karpat, J Piilo, S Maniscalco, Europhysics Letters 111 (5), 50006 (2015).
[2] C Addis, F Ciccarello, M Cascio, GM Palma, S Maniscalco, New Journal of Physics 17 (12), 123004 (2015).
[3] C Addis, G Karpat, S Maniscalco, Physical Review A 92 (6), 062109 (2015).