Experimental study on the Gaussian-modulated coherent-state quantum key distribution over standard telecommunication fibers

Qi, Bing; Huang, Le Hui; Qian, Li; Lo, Hoi-Kwong

doi:10.1103/physreva.76.052323

Cited by 209 publications

(115 citation statements)

References 22 publications

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“…Practically, possible excess noise contributions, expressed as SNUs [18,32], may come from the imperfect modulation, laser phase noise, laser line width, local oscillator fluctuations, and coherent detector imbalance [33].…”

Section: Resultsmentioning

confidence: 99%

“…The best possible solution is to place the classical channels at 200 GHz channel spacing [31] in order to avoid any interference with the weakly powered quantum signals. Most importantly, we have implemented the concept of LLO; hence local oscillator signal is not generated from transmitter by using 90 : 10 coupler [18]. So, apparently with LLO and 200 GHz channel spacing, there is no cross-talk among the hybrid classical-quantum signals in the quantum channel.…”

Section: Hybrid Classical-quantum Traffic In Access Networkmentioning

confidence: 99%

“…DV-QKD protocols, such as BB84 or coherent one-way (COW) [17], involve the generation and detection of very weak optical signals, ideally at single photon level. A range of successful technologies has been implemented via DV-QKD protocol but typically these are quite different from the technologies used in classical communications [18]. CV-QKD protocols have therefore been of interest as these protocols can make use of conventional telecommunication technologies.…”

Section: Introductionmentioning

confidence: 99%

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Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Asif

Buchanan

2017

Security and Communication Networks

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There is current significant interest in Fiber-to-the-Home (FTTH) networks, that is, end-to-end optical connectivity. Currently, it may be limited due to the presence of last-mile copper wire connections. However, in near future, it is envisaged that FTTH connections will exist, and a key offering would be the possibility of optical encryption that can best be implemented using Quantum Key Distribution (QKD). However, it is very important that the QKD infrastructure is compatible with the already existing networks for a smooth transition and integration with the classical data traffic. In this paper, we report the feasibility of using off-the-shelf telecommunication components to enable high performance Continuous Variable-Quantum Key Distribution (CV-QKD) systems that can yield secure key rates in the range of 100 Mbits/s under practical operating conditions. Multilevel phase modulated signals ( -PSK) are evaluated in terms of secure key rates and transmission distances. The traditional receiver is discussed, aided by the phase noise cancellation based digital signal processing module for detecting the complex quantum signals. Furthermore, we have discussed the compatibility of multiplexers and demultiplexers for wavelength division multiplexed Quantum-to-the-Home (QTTH) network and the impact of splitting ratio is analyzed. The results are thoroughly compared with the commercially available high-cost encryption modules.

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Section: Resultsmentioning

confidence: 99%

Section: Hybrid Classical-quantum Traffic In Access Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Asif

Buchanan

2017

Security and Communication Networks

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“…Since the spontaneous Raman scattering coefficient β is wavelength dependent, we have assumed the worst case of β = 4 × 10 −9 (km nm) −1 [11]. The parameters of the GMCS QKD system are from [32]. …”

Section: Sasrs Generated In Smf28 Fibermentioning

confidence: 99%

Feasibility of quantum key distribution through a dense wavelength division multiplexing network

Qi¹,

Zhu²,

Qian³

et al. 2010

New J. Phys.

Self Cite

160

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A balanced homodyne detector for highrate Gaussian-modulated coherent-state quantum key distribution Yue-Meng Chi, Bing Qi, Wen Zhu et al.Quantum key distribution and 1 Gbps data encryption over a single fibre P Eraerds, N Walenta, M Legré et al. Abstract. In this paper, we study the feasibility of conducting quantum key distribution (QKD) together with classical communication through the same optical fiber by employing dense-wavelength-division-multiplexing (DWDM) technology at telecom wavelength. The impact of classical channels on the quantum channel has been investigated for both QKD based on single-photon detection and QKD based on homodyne detection. Our studies show that the latter can tolerate a much higher level of contamination from classical channels than the former. This is because the local oscillator used in the homodyne detector acts as a 'mode selector', which can suppress noise photons effectively. We have performed simulations based on both the decoy BB84 QKD protocol and the Gaussian-modulated coherent state (GMCS) QKD protocol. While the former cannot tolerate even one classical channel (with a power of 0 dBm), the latter can be multiplexed with 38 classical channels (0 dBm power per channel) and still has a secure distance around 10 km. A preliminary experiment has been conducted based on a 100 MHz bandwidth homodyne detector.

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“…There are currently reported continuous variable QKD experiments implemented in optical fiber [18][19][20] and others that simulate a lossy channel with a beamsplitter [21,22]. Compared to the previous work, this is the first experiment to use discrete signaling over optical fiber.…”

Section: Introductionmentioning

confidence: 96%

A 24 km fiber-based discretely signaled continuous variable quantum key distribution system

Dinh¹,

Zhang²,

Voss³

2009

Opt. Express

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Abstract:We report a continuous variable key distribution system that achieves a final secure key rate of 3.45 kb/sec over a distance of 24.2 km of optical fiber. The protocol uses discrete signaling and post-selection to improve reconciliation speed and quantifies security by means of quantum state tomography. Polarization multiplexing and a frequency translation scheme permit transmission of a continuous wave local oscillator and suppression of noise from guided acoustic wave Brillouin scattering by more than 27 dB.

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Experimental study on the Gaussian-modulated coherent-state quantum key distribution over standard telecommunication fibers

Cited by 209 publications

References 22 publications

Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Feasibility of quantum key distribution through a dense wavelength division multiplexing network

A 24 km fiber-based discretely signaled continuous variable quantum key distribution system

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