Heralded quantum steering over a high-loss channel.

Autor: Weston MM; Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, Queensland 4111, Australia., Slussarenko S; Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, Queensland 4111, Australia., Chrzanowski HM; Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, Queensland 4111, Australia.; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK., Wollmann S; Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, Queensland 4111, Australia.; Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, BS8 1FD, UK., Shalm LK; National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA., Verma VB; National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA., Allman MS; National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA., Nam SW; National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA., Pryde GJ; Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, Queensland 4111, Australia.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2018 Jan 05; Vol. 4 (1), pp. e1701230. Date of Electronic Publication: 2018 Jan 05 (Print Publication: 2018).
DOI: 10.1126/sciadv.1701230
Abstrakt: 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 ± 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.
Databáze: MEDLINE
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