Deterministic noiseless amplification of coherent states

TL;DR

This paper demonstrates that deterministic noiseless amplification of certain coherent states is possible, providing a new perspective on quantum state transformation with potential applications in quantum communication.

Contribution

It introduces a method for deterministic noiseless amplification of specific coherent states, expanding the understanding of quantum state transformation.

Findings

Deterministic noiseless amplification of certain coherent states is achievable.

The relation between input states and amplification gain is derived.

Potential applications in QKD, noisy channels, and non-ideal detection are discussed.

Abstract

A universal deterministic noiseless quantum amplifier has been shown to be impossible. However, probabilistic noiseless amplification of a certain set of states is physically permissible. Regarding quantum state amplification as quantum state transformation, we show that deterministic noiseless amplification of coherent states chosen from a proper set is possible. The relation between input coherent states and gain of amplification for deterministic noiseless amplification is thus derived. Besides, the potential applications of amplification of coherent states in quantum key distribution (QKD), noisy channel and non-ideal detection are also discussed.