Noiseless conditional teleportation of a single photon

TL;DR

This paper demonstrates an experimental method for noiselessly teleporting a single photon by conditioning on specific measurement results, effectively preserving quantum features like Wigner function negativity.

Contribution

It introduces a technique for noiseless conditional teleportation that maintains quantum properties by circumventing photon loss during the process.

Findings

Wigner function negativity is preserved after teleportation.

Conditioning on quadrature Bell measurement results reduces photon loss.

Experimental results show clear negativity in the Wigner function post-teleportation.

Abstract

We experimentally demonstrate the noiseless teleportation of a single photon by conditioning on quadrature Bell measurement results near the origin in phase space and thereby circumventing the photon loss that otherwise occurs even in optimal gain-tuned continuous-variable quantum teleportation. In general, thanks to this loss suppression, the noiseless conditional teleportation can preserve the negativity of the Wigner function for an arbitrary pure input state and an arbitrary pure entangled resource state. In our experiment, the positive value of the Wigner function at the origin for the unconditional output state, W(0,0) = 0.015 $\pm$ 0.001, becomes clearly negative after conditioning, W(0,0) = $-$0.025 $\pm$ 0.005, illustrating the advantage of noiseless conditional teleportation.