Fundamental quantum limits for practical devices

TL;DR

This paper establishes experimentally testable quantum limits for phase-insensitive amplification and conjugation, providing benchmarks to evaluate the performance of continuous-variable quantum teleportation and memory devices against fundamental quantum constraints.

Contribution

It introduces practical quantum limitations for Gaussian transformations, enabling comparison of real devices with ideal quantum-limited performance using feasible coherent state inputs.

Findings

Quantum limits for phase-insensitive amplification established

Benchmarking method for quantum teleportation devices developed

Experimental validation of quantum constraints on device performance

Abstract

We present experimentally testable quantum limitations on the phase-insensitive linear amplification and phase conjugation with respect to the transformation of a Gaussian distributed set of coherent states following the footing to assess the success of continuous-variable quantum teleportation and quantum memory devices. The results enable us to compare the real device with the quantum limited device via feasible input of coherent states.