Three-way noiseless signal splitting in a parametric amplifier with quantum correlation

TL;DR

This paper presents a noiseless three-way signal splitting method using a phase-insensitive parametric amplifier with quantum correlation, enabling efficient quantum information distribution and serving as a quantum non-demolition measurement device.

Contribution

It introduces a novel scheme for noiseless three-way signal splitting leveraging quantum correlations, scalable for optical networks and capable of QND measurements.

Findings

Achieves noiseless amplification in two output ports

Maintains original input size in the third port without added noise

Satisfies criteria for quantum non-demolition and sequential QND measurements

Abstract

We demonstrate that a phase-insensitive parametric amplifier, coupled to a quantum correlated source, can be used as a quantum information tap for noiseless three-way signal splitting. We find that the output signals are amplified noiselessly in two of the three output ports while the other can more or less keep its original input size without adding noise. This scheme is able to cascade and scales up for efficient information distribution in an optical network. Furthermore, we find this scheme satisfies the criteria for a non-ideal quantum non-demolition (QND) measurement and thus can serve as a QND measurement device. With two readouts correlated to the input, we find this scheme also satisfies the criterion for sequential QND measurement.