Year: 2015
Type: article
Abstract: The employ of a heralded noiseless linear amplifier has been proven as a useful tool for mitigating imperfections in quantum channels. Its analysis is usually conducted within specific frameworks, for which the set of input states for a given protocol is fixed. Here we obtain a more general description by showing that a noisy and lossy Gaussian channel followed by a heralded noiseless linear amplifier has a general description in terms of effective channels. This has the advantage of offering a simpler mathematical description, best suited for mixed states, both Gaussian and non-Gaussian. We investigate the main properties of this effective system, and illustrate its potential by applying it to loss compensation and reduction of phase uncertainty.
Source: Physical Review A
Institutions: Université Paris-Sud, Centre National de la Recherche Scientifique, The University of Queensland, Centre for Quantum Computation and Communication Technology, Laboratoire Charles Fabry, Roma Tre University, University of Oxford, Sapienza University of Rome, Institut Universitaire de France
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1568436340