TY - JOUR
T1 - Entanglement-Assisted Communication Surpassing the Ultimate Classical Capacity
AU - Hao, Shuhong
AU - Shi, Haowei
AU - Li, Wei
AU - Shapiro, Jeffrey H.
AU - Zhuang, Quntao
AU - Zhang, Zheshen
N1 - Funding Information:
We gratefully acknowledge funding support by the National Science Foundation Grants No. CCF-1907918, No. ECCS-1828132, and No. EEC-1941583 and General Dynamics Mission Systems. Q. Z. also acknowledges support from Defense Advanced Research Projects Agency (DARPA) under Young Faculty Award (YFA) Grant No. N660012014029. J. H. S. acknowledges support from the MITRE Corporation’s Quantum Moonshot Program. The authors thank HC Photonics for providing the nonlinear crystals and William Clark and Saikat Guha for helpful discussions.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/6/25
Y1 - 2021/6/25
N2 - Entanglement underpins a variety of quantum-enhanced communication, sensing, and computing capabilities. Entanglement-assisted communication (EACOMM) leverages entanglement preshared by communicating 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. In this Letter 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 preshared 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 16.3%, when both protocols are subject to the same power constraint at the transmitter. As a practical performance benchmark, we implement a classical communication protocol with the identical characteristics for the encoded signal, 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.
AB - Entanglement underpins a variety of quantum-enhanced communication, sensing, and computing capabilities. Entanglement-assisted communication (EACOMM) leverages entanglement preshared by communicating 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. In this Letter 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 preshared 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 16.3%, when both protocols are subject to the same power constraint at the transmitter. As a practical performance benchmark, we implement a classical communication protocol with the identical characteristics for the encoded signal, 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.
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U2 - 10.1103/PhysRevLett.126.250501
DO - 10.1103/PhysRevLett.126.250501
M3 - Article
C2 - 34241503
AN - SCOPUS:85108910269
SN - 0031-9007
VL - 126
JO - Physical review letters
JF - Physical review letters
IS - 25
M1 - 250501
ER -