Quantum state transfer in frequency down-conversion via nondegenerate optical parametric amplifier

TL;DR

This paper theoretically investigates quantum state transfer from high to low frequency using a nondegenerate optical parametric amplifier, highlighting conditions for noiseless conversion and analyzing key parameters affecting efficiency.

Contribution

It introduces a theoretical model for noiseless quantum state transfer via frequency down-conversion using a nondegenerate optical parametric amplifier, detailing optimal operating conditions.

Findings

Quantum state can be preserved during frequency conversion below the threshold.

High conversion efficiency requires injecting an idler field with power about ten times that of the pump.

Noise figure and efficiency depend on idler amplitude, analyzing frequency, and cavity losses.

Abstract

By utilizing the nondegenerate optical parametric amplifier, the quantum state transfer from a pump state with high frequency to a signal state of lower frequency is studied theoretically. The noiseless state transfer is characterized by frequency conversion efficiency and noise figure. It is shown that the quantum state can be well preserved during the frequency conversion as long as the optical parametric amplifier is operated far below the threshold, and meanwhile injected with an input idler field with a power density about ten times greater than that of the pump. The dependence of the noise figure and conversion efficiency on the idler amplitude, the analyzing frequency and the cavity extra loss is also discussed.