Quantum amplification of noisy coherent states
Year: 2017
Type: preprint
Abstract: Quantum-limited amplifiers increase the amplitude of the signal at the price of introducing additional noise. Quantum purification protocols operate in the reverse way, by reducing the noise while attenuating the signal. Here we investigate a scenario that interpolates between these two extremes. We search for the physical process that produces the best approximation of a pure and amplified coherent state, starting from multiple copies of a noisy coherent state with Gaussian modulation. We identify the optimal quantum processes, considering both the case of deterministic and probabilistic processes. And we give benchmarks that can be used to certify the experimental demonstration of genuine quantum-enhanced amplification.
Source: arXiv (Cornell University)
Authors: Xiaobin Zhao, Giulio Chiribella
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2579216136