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Deterministic entanglement-assisted quantum communication over 20 km fiber channel

Si-Yu Ren, Yanru Yan, Yalin Li +5 more

Entanglement-assisted quantum communication has substantial advantages in surpassing the power of classical communication by utilizing the entangled state. Up to now, most of entanglement-assisted quantum communications with dense coding are limited to the proof-of-principle experiments. Here, we experimentally demonstrate the deterministic entanglement-assisted quantum communication based on the continuous-variable (CV) entangled state over 20 km commercial fiber channels. We propose a new CV dense coding scheme with improved classical signals and show that the transmission distance of CV entanglement-assisted quantum communication can be extended compared with that using fixed classical signals. By applying the frequency division multiplexing technique, we simultaneously decode 10 classical signals submerged in the shot noise of coherent state with the help of CV entangled state after the transmission through a 20.121 km fiber channel. The results show that around 3 times of channel capacity in classical communication with coherent state are achieved in the CV entanglement-assisted communication with the frequency division multiplexing technique. Our result takes a crucial step towards realizing the deterministic metropolitan entanglement-assisted quantum communication in practical quantum channels.Entanglement-assisted quantum communication has substantial advantages in surpassing the power of classical communication by utilizing the entangled state. Up to now, most of entanglement-assisted quantum communications with dense coding are limited to the proof-of-principle experiments. Here, we experimentally demonstrate the deterministic entanglement-assisted quantum communication based on the continuous-variable (CV) entangled state over 20 km commercial fiber channels. We propose a new CV dense coding scheme with improved classical signals and show that the transmission distance of CV entanglement-assisted quantum communication can be extended compared with that using fixed classical signals. By applying the frequency division multiplexing technique, we simultaneously decode 10 classical signals submerged in the shot noise of coherent state with the help of CV entangled state after the transmission through a 20.121 km fiber channel. The results show that around 3 times of channel capacity in classical communication with coherent state are achieved in the CV entanglement-assisted communication with the frequency division multiplexing technique. Our result takes a crucial step towards realizing the deterministic metropolitan entanglement-assisted quantum communication in practical quantum channels.

Light Science & ApplicationsJan 23, 20263 citations

Quantum communication at 7,600km and beyond

Chao‐Yang Lu, Cheng-Zhi Peng, Jian-Wei Pan

Communications of the ACMOct 26, 20185 citations

Long Distance Quantum Communication with Atomic Ensembles

C. W. Chou, Sergey V. Polyakov, D. Felinto +3 more

The ability to distribute quantum resources over long distances is a key \nelement for the development of several practical applications in the field of \nquantum information. In this way, major efforts have been made in the \npast decade to extend the maximum distances for the observation of entanglement \nor for the realization of quantum cryptography. Using optical fibers \nas the quantum channel, entanglement has already been achieved between \nphotons separated by 50 km of fiber, and quantum cryptography is now a \ncommercial technology that allows quantum key distributon over distances \nup to around 100 km. Progress has also been made towards entanglement \ndistribution in free space, with the achieved distances of about 10 km \non ground atmosphere being a substantial step toward the development \nof satellite-based quantum communication.The ability to distribute quantum resources over long distances is a key \nelement for the development of several practical applications in the field of \nquantum information. In this way, major efforts have been made in the \npast decade to extend the maximum distances for the observation of entanglement \nor for the realization of quantum cryptography. Using optical fibers \nas the quantum channel, entanglement has already been achieved between \nphotons separated by 50 km of fiber, and quantum cryptography is now a \ncommercial technology that allows quantum key distributon over distances \nup to around 100 km. Progress has also been made towards entanglement \ndistribution in free space, with the achieved distances of about 10 km \non ground atmosphere being a substantial step toward the development \nof satellite-based quantum communication.

IMPERIAL COLLEGE PRESS eBooksFeb 1, 20070 citations

Super Distance Communication with Quantum Entanglement

楷袁

HANS Publication PrePrintsJan 1, 20170 citations

Long-distance quantum communication

Hans J. Briegel

WORLD SCIENTIFIC eBooksJan 1, 20010 citations

Experimental investigation of the robustness of partially entangled qubits over 11 km

Rob Thew, Sébastien Tanzilli, Wolfgang Tittel +2 more

We experimentally investigate time-bin qubits for distributed quantum communication. The robustness of maximal and nonmaximal time-bin entangled qubits (photons) over distances up to 11 km is shown. The entanglement is set by controllable parameters and in all cases is found to be robust, in that the qubits maintain their degree of entanglement after transmission along telecommunication fiber.

arXiv:quant-ph/0203067Physical Review ADec 6, 2002119 citations

Entanglement-based quantum communication over 144 km

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