Real-time heralded non-Gaussian teleportation resource-state generator

TL;DR

This paper reports the experimental creation and real-time use of a heralded non-Gaussian entangled resource state for quantum teleportation, achieving high fidelity and enabling advanced quantum networking applications.

Contribution

It introduces a real-time heralded non-Gaussian resource state generator with live quadrature measurement capabilities, advancing quantum teleportation and networking.

Findings

Fidelity of 0.973 with the expected state

Real-time heralding with low jitter and latency

Enables use in quantum repeaters and sensing

Abstract

Quantum teleportation is a fundamental quantum communications primitive that requires an entangled resource state. In the continuous-variable regime, non-Gaussian entangled resources have been shown theoretically to improve teleportation fidelity compared to Gaussian squeezed vacuum. We experimentally demonstrate a heralded two-mode resource state for non-Gaussian teleportation capable of real-time use. We characterize this state with two-mode homodyne tomography showing it has fidelity $F=0.973\pm 0.005$ with the expected resource state. Real-time use is enabled by a photon-subtraction orchestrator system performing live coincidence detection and outputting low-jitter and low-latency heralding signals. Live collection of real-time quadrature measurements of photon-subtracted states is enabled by the development of a synchronized homodyne detection server where the orchestrator system queries to collect the real-time quadrature samples corresponding to the heralded state. These results demonstrate significant advancement in enabling the use of heralded non-Gaussian states in quantum networking protocols, especially in the context of quantum repeaters, non-Gaussian quantum sensing and measurement-based quantum computing.