Homodyne Detection Quadrature Phase Shift Keying Continuous-Variable Quantum key Distribution with High Excess Noise Tolerance

Liu, Wen-Bo; Li, Chen-Long; Xie, Yuan-Mei; Weng, Chen-Xun; Gu, Jie; Cao, Xiaoyu; Lu, Yu-Shuo; Li, Bing-Hong; Yin, Hua-Lei; Chen, Zeng-Bing

doi:10.1103/prxquantum.2.040334

Cited by 70 publications

(26 citation statements)

References 67 publications

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“…In the experiment, we utilize four-intensity decoy-state quantum key distribution to generate the secret keys for the QDS processes in our QBA protocol [52]. We note that networks using any quantum key distribution protocols [53][54][55][56][57][58] can serve as the basis for our QBA scheme. There are five independent users, A, B, C, D and E. The secret keys of different pairwise users are pre-generated in the laboratory via a fibre spool.…”

Section: Experimental Implementationmentioning

confidence: 99%

Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution

Weng¹,

Gao²,

Yu³

et al. 2022

Preprint

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Byzantine agreement, the underlying core of blockchain, aims to make every node in a decentralized network reach consensus. However, the classical Byzantine agreement faces two major problems. One is the 1/3 fault-tolerance bound, which means the system to tolerate f malicious nodes requires at least 3f + 1 nodes. The other problem is the security loopholes of its classical cryptography methods. Here, we propose a quantum Byzantine agreement that exploits the recursion method and quantum digital signatures to break this bound with nearly 1/2 fault-tolerance and provides unconditional security. The consistency check between each pair of rounds ensures the unforgeability and nonrepudiation throughout the whole process. Our protocol is highly practical for its ability to transmit arbitrarily long messages and mature techniques. For the first time, we experimentally demonstrate three-party and five-party quantum consensus for a digital ledger. Our work suggests an important avenue for quantum blockchain and quantum consensus networks.

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Section: Experimental Implementationmentioning

confidence: 99%

Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution

Weng¹,

Gao²,

Yu³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Quantum key distribution (QKD) allows two remote parties, commonly known as Alice and Bob, to share a secure encryption key by exchanging qubits encoded into a single photon [1][2][3] . Since the first QKD protocol was proposed in 1984 [4] , QKD has been successfully demonstrated in many systems and protocols , the more famous of which are the decoy state protocol [14] , measurement-device-independent (MDI) QKD [15][16][17][18] , continuous variable (CV) QKD [19][20][21] , and two-field (TF) QKD [22][23][24][25] . In order to ensure secure communication with many different parties, various QKD networks have been proposed [26][27][28][29][30][31][32][33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Phase modulation polarization encoding module applied to one-to-many QKD network based on wavelength division multiplexing

Zhang

Qin²,

Wang

et al. 2022

中国光学快报

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The quantum key distribution (QKD) network is a promising solution for secure communications. In this paper, we proposed a polarization-independent phase-modulated polarization encoding module, and it can be combined with a dense wavelength division multiplexer (DWDM) to achieve multi-user QKD. We experimentally test the encoding module with a repetition rate of 62.5 MHz, and its average quantum bit error rate (QBER) is as low as 0.4%. Finally, we implement a principle verification test for simultaneous QKD for 1 to 2 users in 100 min, and the average QBER of two users under the transmission distance of 1 km and 5 km is kept below 0.8%. Due to the use of polarization encoding, the module can also realize scalable network architecture in free-space QKD systems in the future.

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“…Its security is provided by the laws of quantum physics. The existing QKD models are mainly divided into two groups: discrete-variable (DV) schemes 1 – 9 and continuous-variable (CV) schemes 10 – 12 . Detailed reviews on these two types of QKD are given in Refs.…”

Section: Introductionmentioning

confidence: 99%

More optimal relativistic quantum key distribution

Bebrov

2022

Sci Rep

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A great challenge in the field of quantum cryptography is the design and implementation of optimal quantum key distribution (QKD) scheme. An optimal scheme in terms of security is the so-called relativistic quantum key distribution; it ensures the security of the system by using both quantum phenomena and relativity. However, the existing relativistic schemes have not demonstrated optimality in terms of efficiency and rate (including secret key rate). Here we report two point-to-point relativistic quantum key distribution schemes implemented with weak coherent pulses. Both schemes rely on high-dimensional quantum systems (phase and polarization encodings are utilized for establishing key bits). One of the proposed schemes is a system comprised of two sequentially connected interferometers, as the first (interferometer) controls the behavior of the second one. The other proposed scheme represents a setup of a classic relativistic QKD, but with slight modification. Both of the proposed schemes are characterized with high secret key rate. The latter scheme has the highest secret key rate of all the relativistic QKD protocols. However, the values for the secret key rate are relevant for distances of up to 150 km. The former scheme has lower secret key rate, but longer operating distances (the work could operate at distances of up to 320 km). Those values of rate are obtained without disturbing the security. Secret-key-rate comparison between distinct models is reported. The proposed relativistic models are compared to twin-field QKD protocols. Furthermore, the work proposes a metric for evaluating the optimality of a QKD. It is defined as a ratio between the secret key rate (at a given distance) and the amount of quantum resources (qubits) used in the QKD of concern. It is shown that one of the proposed schemes in this article is the most optimal relativistic key distribution and more optimal than the original twin-field. It is also verified that the proposed schemes excels the original twin-field in terms of secret key rate, but for short distances.

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Homodyne Detection Quadrature Phase Shift Keying Continuous-Variable Quantum key Distribution with High Excess Noise Tolerance

Cited by 70 publications

References 67 publications

Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution

Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution

Phase modulation polarization encoding module applied to one-to-many QKD network based on wavelength division multiplexing

More optimal relativistic quantum key distribution

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