Unified view of quantum amplification based on quantum transformation

TL;DR

This paper presents a comprehensive framework for quantum state amplification, classifying different types, analyzing their properties, and establishing fundamental relations, with a focus on phase-preserving Gaussian state amplification relevant to quantum communication.

Contribution

It introduces a systematic quantum transformation-based framework for amplification, clarifies the nature of noiseless and noisy amplification, and derives relations between gain and success probability.

Findings

Deterministic noiseless amplification is physically attainable if linearity is relaxed.

Linearity is incompatible with noiseless amplification in deterministic cases.

A general relation between gain and success probability is established for probabilistic amplification.

Abstract

A general framework of quantum state amplification using the language of quantum state transformation is given systematically for the first time. The concept of amplification of quantum states is defined specifically and the amplification of a set of quantum states is formulated generally as the transformation of quantum states. Three different kinds of important quantum amplifications, i.e., deterministic noisy quantum amplification, probabilistic noiseless quantum amplification, and deterministic noiseless quantum amplification are identified and discussed. For deterministic quan- tum amplification, the linearity of amplification is proven to be incompatible with the noiseless amplification while it is not true for probabilistic quantum amplification. However, deterministic noiseless quantum amplification is shown physically attainable if the linearity of amplification is given up. The connection between the gain of amplification and the successful probability is discussed for probabilistic quantum amplification. Assuming that successful probability is the same for all quantum states to be amplified, we obtain a generally valid relation between the gain of amplication and the successful probability. Particular interest is given to phase-preserving quantum amplication of Gaussian states which has been shown of theoretical interest and of practical importance in quantum information and quantum communication recently. Our results of quantum state amplification not only enrich the research of quantum amplification but also can be helpful for further practical applications.