Entanglement underpins a variety of quantum-enhanced communication, sensing, and computing capabilities. Entanglement-assisted communication (EACOMM) leverages entanglement pre-shared by communication parties to boost the rate of classical information transmission. Pioneering theory works showed that EACOMM can enable a communication rate well beyond the ultimate classical capacity of optical communications, but an experimental demonstration of any EACOMM advantage remains elusive. Here, we report the implementation of EACOMM surpassing the classical capacity over lossy and noisy bosonic channels. We construct a high-efficiency entanglement source and a phase-conjugate quantum receiver to reap the benefit of pre-shared entanglement, despite entanglement being broken by channel loss and noise. We show that EACOMM beats the Holevo-Schumacher-Westmoreland capacity of classical communication by up to 14.6%, when both protocols are subject to the same power constraint at the transmitter. As a practical performance benchmark, a classical communication protocol without entanglement assistance is implemented, showing that EACOMM can reduce the bit-error rate by up to 69% over the same bosonic channel. Our work opens a route to provable quantum advantages in a wide range of quantum information processing tasks.
Superadditivity for Entanglement-Assisted Communication
National Taiwan University（台湾大学）；National Center for Theoretical Sciences（国家理论科学中心）；Hon Hai (Foxconn) Quantum Computing Center（鸿海（富士康）量子计算中心）；RWTH Aachen University（亚琛工业大学）
Rensselaer Polytechnic Institute（拉特格斯理工大学）；University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；University of Pittsburgh（匹兹堡大学）；University of Chicago（芝加哥大学）；Novo Nordisk A/S（诺和制药）；Harvard University（哈佛大学）
Agent-assisted experimental strategy transfer across quantum processors
College of Physics and Electronic Engineering, Center for Computational Sciences, Sichuan Normal University（四川师范大学物理与电子工程学院计算科学中心）；Shenzhen SpinQ Technology Co., Ltd.（深圳-spinq科技有限公司）；College of Physics and Optoelectronic Engineering, Shenzhen University（深圳大学物理与光电工程学院）
Harvard University（哈佛大学）；Harvard Quantum Initiative, Harvard University（哈佛量子倡议，哈佛大学）；Lincoln Laboratory, Massachusetts Institute of Technology（林肯实验室，麻省理工学院）；University of Maryland（马里兰大学）
Driving Quantum Heat Engines Beyond Classical Limits through Multilevel Coherence
Institute for Quantum Science and Engineering, Texas A&M University（德克萨斯农工大学量子科学与工程研究所）；Okinawa Institute of Science and Technology Graduate University（冲绳科学技术大学院大学）；Baylor University（贝勒大学）；Princeton University（普林斯顿大学）
Non-signaling assistance in prepare-and-measure scenarios with classical communication
Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas（坎皮纳斯州立大学格莱布·瓦塔金物理研究所）；Instituto de Matemática, Estatística e Computação Científica, Universidade Estadual de Campinas（坎皮纳斯州立大学数学、统计与科学计算研究所）；Sorbonne Université, CNRS, LIP6（索邦大学法国国家科学研究中心LIP6实验室）；International Centre for Theory of Quantum Technologies, University of Gdańsk（格但斯克大学量子技术理论国际中心）；Naturwissenschaftlich-Technische Fakultät, Universität Siegen（锡根大学自然科学技术学院）
