A balanced homodyne detector for high-rate Gaussian-modulated coherent-state quantum key distribution

Meng, Yue; Qi, Bing; Zhu, Wenli; Qian, Li; Lo, Hoi Kwong; Youn, Sung Won; Lvovsky, A. I.; Tian, Liang

doi:10.1088/1367-2630/13/1/013003

Cited by 117 publications

(101 citation statements)

References 48 publications

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“…In brief, it is much more challenging to recover the carrier phase in quantum communication. Although a complete CV-QKD experiment using the proposed scheme is not presented in this paper, all the components required to implement such a system, including broadband shot-noise-limited homodyne detectors [40][41][42], have been well developed. In fact, the structure of the proposed QKD system is much simpler compared to the conventional scheme [12].…”

Section: Discussionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a "locally" generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad 2 ), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.

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Section: Discussionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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“…We have kept the input power constant for every iteration. Furthermore, SKR for both the 4-PSK and 8-PSK modulation formats under collective attack [22] are depicted in Figure 4(a). The maximum of 100 Mbits/s SKR can be achieved with this configuration by employing COTS modules for transmittance ( ) = 1 for 4-PSK modulation, while SKR are ≈25 Mbits/s and 1 Mbit/s at = 0.8 and 0.6, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The lack of an advanced reconciliation technique at low SNR values limits the transmission distance of CV-QKD systems to 60 km, which is lower than that for DV-QKD systems [21]. The secure key rate of CV-QKD is limited by the bandwidth of the balanced homodyne detector (BHD) and the performance of reconciliation schemes, which is degraded by the excess noise observed at high data rates [22].…”

Section: Introductionmentioning

confidence: 99%

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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“…We remark that building a broadband shot noise-limited homodyne detector operating above a few hundred MHz is technically challenging. [37][38][39] This may in turn limit the ultimate operating speed of this type of QRNG.…”

Section: Vacuum Noisementioning

confidence: 99%

Quantum random number generation

Ma¹,

Yuan²,

Cao³

et al. 2016

npj Quantum Inf

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317

215

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Quantum physics can be exploited to generate true random numbers, which have important roles in many applications, especially in cryptography. Genuine randomness from the measurement of a quantum system reveals the inherent nature of quantumnesscoherence, an important feature that differentiates quantum mechanics from classical physics. The generation of genuine randomness is generally considered impossible with only classical means. On the basis of the degree of trustworthiness on devices, quantum random number generators (QRNGs) can be grouped into three categories. The first category, practical QRNG, is built on fully trusted and calibrated devices and typically can generate randomness at a high speed by properly modelling the devices. The second category is self-testing QRNG, in which verifiable randomness can be generated without trusting the actual implementation. The third category, semi-self-testing QRNG, is an intermediate category that provides a tradeoff between the trustworthiness on the device and the random number generation speed.

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A balanced homodyne detector for high-rate Gaussian-modulated coherent-state quantum key distribution

Cited by 117 publications

References 48 publications

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

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

Quantum random number generation

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