Alternative schemes for measurement-device-independent quantum key distribution

Ma, Xiongfeng; Razavi, Mohsen

doi:10.1103/physreva.86.062319

Cited by 223 publications

(188 citation statements)

References 68 publications

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“…With decoy-state optimization, the laser-pulse probabilities of the vacuum state, weak decoy state, and signal state are 16%, 58%, and 26%, and their intensities are modulated by AM1 into 0, ν ¼ 0.1, and μ ¼ 0.33, respectively. Each user employs the time-bin phase-encoding scheme [29], in which only the raw data in the Z basis are used for final key generation, and those in the X basis are used for phase-error estimation. The signal state is encoded in the Z basis.…”

Section: B Theoretical Optimizationmentioning

confidence: 99%

Measurement-Device-Independent Quantum Key Distribution over Untrustful Metropolitan Network

et al. 2016

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Quantum cryptography holds the promise to establish an information-theoretically secure global network. All field tests of metropolitan-scale quantum networks to date are based on trusted relays. The security critically relies on the accountability of the trusted relays, which will break down if the relay is dishonest or compromised. Here, we construct a measurement-device-independent quantum key distribution (MDIQKD) network in a star topology over a 200-square-kilometer metropolitan area, which is secure against untrustful relays and against all detection attacks. In the field test, our system continuously runs through one week with a secure key rate 10 times larger than previous results. Our results demonstrate that the MDIQKD network, combining the best of both worlds-security and practicality, constitutes an appealing solution to secure metropolitan communications.

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Section: B Theoretical Optimizationmentioning

confidence: 99%

Measurement-Device-Independent Quantum Key Distribution over Untrustful Metropolitan Network

et al. 2016

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“…Finally, we need to maintain polarization across the channel, which can be challenging over long distances. This condition can be alleviated by using an equivalent phase-encoding scheme [29].…”

Section: -5mentioning

confidence: 99%

Measurement-device-independent quantum key distribution with nitrogen vacancy centers in diamond

2017

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Memory-assisted measurement-device-independent quantum key distribution (MA-MDI-QKD) has recently been proposed as a possible intermediate step towards the realization of quantum repeaters. Despite its relaxing some of the requirements on quantum memories, the choice of memory in relation to the layout of the setup and the protocol has a stark effect on our ability to beat existing no-memory systems. Here, we investigate the suitability of nitrogen vacancy (NV) centers, as quantum memories, in MA-MDI-QKD. We particularly show that moderate cavity enhancement is required for NV centers if we want to outperform no-memory QKD systems. Using system parameters mostly achievable by today's state of the art, we then anticipate some total key rate advantage in the distance range between 300 and 500 km for cavity-enhanced NV centers. Our analysis accounts for major sources of error including the dark current, the channel loss, and the decoherence of the quantum memories.

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“…The MDI-QKD protocol [23][24][25] was first proposed to defend detector side channels. Then many methods were introduced to improve the secret key rate and transmission distance of the protocol, such as using different kinds of sources [26][27][28], explicitly utilizing the decoy states to dramatically increase the secret key rates [29,30], enhancing the practical security by tight finite-size analysis [31][32][33], etc.…”

Section: Introductionmentioning

confidence: 99%

Continuous-variable measurement-device-independent quantum key distribution using squeezed states

Zhang

et al. 2014

Phys. Rev. A

107

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A continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol using squeezed states is proposed where the two legitimate partners send Gaussian-modulated squeezed states to an untrusted third party to realize the measurement. Security analysis shows that the protocol can not only defend all detector side channels, but also attain higher secret key rates than the coherent-state-based protocol. We also present a method to improve the squeezed-state CV-MDI QKD protocol by adding proper Gaussian noise to the reconciliation side. It is found that there is an optimal added noise to optimize the performance of the protocol in terms of both key rates and maximal transmission distances. The resulting protocol shows the potential of long-distance secure communication using the CV-MDI QKD protocol.

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Alternative schemes for measurement-device-independent quantum key distribution

Cited by 223 publications

References 68 publications

Measurement-Device-Independent Quantum Key Distribution over Untrustful Metropolitan Network

Measurement-Device-Independent Quantum Key Distribution over Untrustful Metropolitan Network

Measurement-device-independent quantum key distribution with nitrogen vacancy centers in diamond

Continuous-variable measurement-device-independent quantum key distribution using squeezed states

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