Ideal Quantum Tele-amplification up to a Selected Energy Cut-off using Linear Optics

TL;DR

This paper presents a linear optical method for ideal quantum tele-amplification up to a specified energy level, significantly enhancing success probability and resource efficiency over existing schemes.

Contribution

The authors introduce a novel linear optical protocol for ideal quantum tele-amplification up to the n-th Fock state, improving success rates and resource costs.

Findings

Achieves ideal tele-amplification up to the n-th Fock state.

Significantly reduces resource costs compared to existing methods.

Can be used as a loss-tolerant quantum relay for entanglement distribution.

Abstract

We introduce a linear optical technique that can implement ideal quantum tele-amplification up to the $n^\mathrm{th}$ Fock state, where $n$ can be any positive integer. Here tele-amplification consists of both quantum teleportation and noiseless linear amplification (NLA). This simple protocol consists of a beam-splitter and an $(n+1)$-splitter, with $n$ ancillary photons and detection of $n$ photons. For a given target fidelity, our technique improves success probability and physical resource costs by orders of magnitude over current alternative teleportation and NLA schemes. We show how this protocol can also be used as a loss-tolerant quantum relay for entanglement distribution and distillation.