Heralded quantum steering over a high-loss channel

Abstract

Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least $14.8\pm 0.1$ dB of added loss, equivalent to approximately $80$ km of telecommunication fiber. Our protocol relies on entanglement swapping to herald the presence of a photon after the lossy channel, enabling event-ready implementation of quantum steering. This result overcomes the key barrier in device-independent communication under realistic high-loss scenarios and in the realization of a quantum repeater.

8 pages, 5 figures

References in corpus (5)

• Steering, Entanglement, Nonlocality, and the EPR Paradox
• Loopholes in Bell Inequality Tests of Local Realism
• High-fidelity entanglement swapping with fully independent sources
• Highly efficient entanglement swapping and teleportation at telecom wavelength
• Experimental device-independent verification of quantum steering

Cited by in corpus (24)

• Photonic quantum information processing: a review
• Photonic quantum information processing: a concise review
• Quantum Steering
• Air-core fiber distribution of hybrid vector vortex-polarization entangled states
• Demonstration of Einstein-Podolsky-Rosen Steering Using Hybrid Continuous- and Discrete-Variable Entanglement of Light
• Tuning quantum channels to maximize polarization entanglement for telecom photon pairs
• Experimental demonstration of robust quantum steering
• Noise-Robust and Loss-Tolerant Quantum Steering with Qudits
• Quantum steering with vector vortex photon states with the detection loophole closed
• Heralded amplification of nonlocality via entanglement swapping for long-distance device-independent quantum key distribution
• Certified Random Number Generation from Quantum Steering
• Quantum channel correction outperforming direct transmission
• Measurement-device-independent and arbitrarily loss-tolerant verification of quantum steering
• Exponentially Enhanced Scheme for the Heralded Qudit GHZ State in Linear Optics
• A Local Area Quantum Teleportation Network Based on an Array of Electrically Activated Graphene Waveguide
• Detecting the genuine multipartite two-way steerability with linear steering inequalities
• Diagnosing steerability of a bipartite state with the nonsteering threshold
• Averaged fidelity-based steering criteria
• Scalable multiparty steering based on a single pair of entangled qubits
• Steering nonlocality in high-speed telecommunication system without detection loophole
• Demonstration that Einstein-Podolsky-Rosen steering requires more than one bit of faster-than-light information transmission
• Correcting for finite statistics effects in a quantum steering experiment
• Naïve Infinitesimal Analysis: Its Construction and Its Properties
• Cyclic Einstein-Podolsky-Rosen Steering