# Field experiment on a robust hierarchical metropolitan quantum cryptography network

@article{Xu2009FieldEO, title={Field experiment on a robust hierarchical metropolitan quantum cryptography network}, author={Fang-Xing Xu and Wei Chen and Shuang Wang and Zhen-Qiang Yin and Yang Zhang and Yun Liu and Zheng-Wei Zhou and Yibo Zhao and Hongwei Li and Dong Liu and Zhengfu Han and Guangcan Guo}, journal={Chinese Science Bulletin}, year={2009}, volume={54}, pages={2991-2997} }

A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The seven-user network contains a four-node backbone net with one node acting as the subnet gateway, a two-user subnet and a single-fiber access link, which is realized by the Faraday-Michelson interferometer set-ups. The techniques of the quantum router, optical switch and trusted relay are assembled here to guarantee the feasibility and expandability of the…

## 115 Citations

### ENCRYPTION-BASED NETWORKING QUANTUM TELEPORTATION WITH TRIPLET GREENBERGER–HORNE–ZEILINGER STATES

- Computer Science, Physics
- 2010

An encryption-based networking quantum teleportation scheme is proposed for the secure quantum communication network based on the novel networking quantum key distribution (NQKD) with the…

### Quantum Key Distribution

- Computer ScienceACM Comput. Surv.
- 2021

This article surveys previously applied methods, showing techniques for deploying QKD networks and current challenges of QKKD networking, and focuses on the network aspect by considering network organization, routing and signaling protocols, simulation techniques, and a software-defined QkD networking approach.

### A trusted node–free eight-user metropolitan quantum communication network

- Computer ScienceScience Advances
- 2020

This work presents a fully connected quantum communication network on a city-wide scale without active switching or trusted nodes, and demonstrates simultaneous and secure connections between all 28 pairings of eight users.

### Optimization of QKD Networks with Classical and Quantum Annealing

- Computer ScienceArXiv
- 2022

A classical and a quantum annealing approach to compute the minimum deployment of Quantum Key Distribution (QKD) hardware in a tier 1 provider network yields a classical heuristic network planners may utilize for planning fu-ture QKD quantum networks.

### Real applications of quantum communications in China

- Computer Science
- 2009

The first metropolitan quantum cryptography network for government administration, which is named “QGovernment”, has recently been field tested in Wuhu, Anhui Province by researchers of Key…

### An entanglement-based wavelength-multiplexed quantum communication network

- Computer Science, Physics2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
- 2019

A fully connected quantum network is demonstrated in which one source of entangled photons distributes quantum states to four users, with the potential for many more users to be added.

### The QKD network: From metropolitan to wide area

- Computer Science2013 IEEE Photonics Society Summer Topical Meeting Series
- 2013

Experimental QKD has achieved significant improvements, such as the transmission distance increased from 32 cm to 260 km, the speed increased from 200 Hz to 10 GHz, and the security of these keys could be proved.

### Quantum-Classical Access Networks with Embedded Optical Wireless Links

- Computer Science2016 IEEE Globecom Workshops (GC Wkshps)
- 2016

We examine the applicability of wireless indoor quantum key distribution (QKD) in hybrid quantum-classical networks. We propose practical configurations that would enable wireless access to such…

### Low-cost lightweight-client twin-field quantum key distribution network with wavelength division multiplexing

- Physics, Computer ScienceOptical Engineering
- 2022

This work proposes a low-cost, lightweight-client, twin-field QKD network with wavelength division multiplexing (WDM), which can effectively reduce the cost to less than half of that of current QKKD networks and has reference significance for large-scale deployment of QkD networks.

### Realizing long-term quantum cryptography

- Computer Science
- 2010

An overview of practical implementations of quantum networks and the first set of results from the live data encryption of the QuantumCity project, which intends to develop a multi-user quantum communication network that is currently overlaid on the fiber infrastructure of the eThekwini Municipality.

## References

SHOWING 1-10 OF 32 REFERENCES

### Field Experiment on a “Star Type” Metropolitan Quantum Key Distribution Network

- PhysicsIEEE Photonics Technology Letters
- 2009

A realization of a wavelength-routing star type QKD network which can span a metropolis using a commercial backbone optical fiber network without trusted relays is reported.

### Quantum cryptography on multiuser optical fibre networks

- Computer ScienceNature
- 1997

A practical scheme for multi-user quantum cryptography is introduced, and its operation on an optical fibre network is demonstrated, which enables a single controller on the network to establish, and regularly update, a distinct secret key with each network user.

### Demonstration of an active quantum key distribution network

- Computer ScienceSPIE Optics + Photonics
- 2006

We previously demonstrated a high speed, point to point, quantum key distribution (QKD) system with polarization coding over a fiber link, in which the resulting cryptographic keys were used for…

### Field test of a practical secure communication network with decoy-state quantum cryptography.

- Computer ScienceOptics express
- 2009

A secure network communication system that operated with decoy-state quantum cryptography in a real-world application scenario and generated quantum keys that were immediately employed for communication applications, including unbreakable real-time voice telephone between any two of the three communication nodes.

### Design of quantum cryptography systems for passive optical networks

- Computer Science, Mathematics
- 1994

Adaptations of the existing quantum cryptography protocols and equipment configurations that allow secure key distribution to be performed on a variety of multiuser passive optical network (PON) architectures enable the network controller on the PON to distribute individual secret keys to each user on the network.

### Multiple stochastic paths scheme on partially-trusted relay quantum key distribution network

- Computer ScienceScience in China Series F: Information Sciences
- 2009

A multiple stochastic paths scheme to solve the fatal security problems of partially-trusted relay networks and its features are a safe probability model that may be more practical for real applications and an adaptive stochastically routing algorithm to generate sufficient different paths and hidden routes.

### Faraday-Michelson system for quantum cryptography.

- PhysicsOptics letters
- 2005

A unidirectional intrinsically stable scheme that is based on Michelson-Faraday interferometers, in which ordinary mirrors are replaced with 90 degree Faraday mirrors is presented, which is to the authors' knowledge the longest reported quantum key distribution experiment under field conditions.

### Building the quantum network*

- Computer Science
- 2002

We show how quantum key distribution (QKD) techniques can be employed within realistic, highly secure communications systems, using the internet architecture for a specific example. We also discuss…