Security of a New Two-Way Continuous-Variable Quantum Key Distribution Protocol

Sun, Maozhu; Peng, Xiang; Shen, Yujie; Guo, Hong

doi:10.1142/s0219749912500591

Cited by 31 publications

(66 citation statements)

References 40 publications

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“…Bob uses data, where µ is the parameter used to optimize Bob's estimator. This process is similar to the approach in the two-way CV-QKD protocols [33][34][35][36][37][38].…”

Section: A Non-gaussian Post-selection In Cv-mdi Qkdmentioning

confidence: 99%

Continuous-variable measurement-device-independent quantum key distribution with virtual photon subtraction

Zhao

Zhang

et al. 2018

Phys. Rev. A

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The method of improving the performance of continuous-variable quantum key distribution protocols by post-selection has been recently proposed and verified. In continuous-variable measurementdevice-independent quantum key distribution (CV-MDI QKD) protocols, the measurement results are obtained from untrusted third party Charlie. There is still not an effective method of improving CV-MDI QKD by the post-selection with untrusted measurement. We propose a method to improve the performance of coherent-state CV-MDI QKD protocol by virtual photon subtraction via non-Gaussian post-selection. The non-Gaussian post-selection of transmitted data is equivalent to an ideal photon subtraction on the two-mode squeezed vacuum state, which is favorable to enhance the performance of CV-MDI QKD. In CV-MDI QKD protocol with non-Gaussian post-selection, two users select their own data independently. We demonstrate that the optimal performance of the renovated CV-MDI QKD protocol is obtained with the transmitted data only selected by Alice. By setting appropriate parameters of the virtual photon subtraction, the secret key rate and tolerable excess noise are both improved at long transmission distance. The method provides an effective optimization scheme for the application of CV-MDI QKD protocols.

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“…Bob uses data, where µ is the parameter used to optimize Bob's estimator. This process is similar to the approach in the two-way CV-QKD protocols [33][34][35][36][37][38].…”

Section: A Non-gaussian Post-selection In Cv-mdi Qkdmentioning

confidence: 99%

Continuous-variable measurement-device-independent quantum key distribution with virtual photon subtraction

Zhao

Zhang

et al. 2018

Phys. Rev. A

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“…The proposed scalar reconciliation eliminates the use of multidimensional spherical space along with the dimensional boundaries and can be used in arbitrary high dimensions. The scalar reconciliation process neither requires any physical-layer tomography [1][2][3][4][5][6][7][8], and only standard operations and calculations needed in the level of raw data. The method provides unconditional security, and allows a much easier implementation to maximize the extractable valuable binary information from the correlated raw data to significantly boost up the key rates and to improve the distance ranges of two-way CVQKD.…”

Section: Discussionmentioning

confidence: 99%

“…The two-way CVQKD systems were introduced for practical reasons to exceed the limitations of one-way CVQKD, such as low key rates and short communication distances [1][2][3][4][5][6][7][8]. The two-way CVQKD protocols exploit the benefits of multiple channel uses and allow the leak of only lower valuable information to the eavesdropper, and they are also …”

Section: Introductionmentioning

confidence: 99%

Long-distance continuous-variable quantum key distribution with advanced reconciliation of a Gaussian modulation

Gyöngyösi

Imre

2014

SPIE Proceedings

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The two-way continuous-variable quantum key distribution (CVQKD) systems allow higher key rates and improved transmission distances over standard telecommunication networks in comparison to the one-way CVQKD protocols. To exploit the real potential of two-way CVQKD systems a robust reconciliation technique is needed. It is currently unavailable, which makes it impossible to reach the real performance of a two-way CVQKD system. The reconciliation process of correlated Gaussian variables is a complex problem that requires either tomography in the physical layer that is intractable in a practical scenario, or high-cost calculations in the multidimensional spherical space with strict dimensional limitations. To avoid these issues, we propose an efficient logical layer-based reconciliation method for two-way CVQKD to extract binary information from correlated Gaussian variables. We demonstrate that by operating on the raw-data level, the noise of the quantum channel can be corrected in the scalar space and the reconciliation can be extended to arbitrary high dimensions. We prove that the error probability of scalar reconciliation is zero in any practical CVQKD scenario, and provides unconditional security. The results allow to significantly improve the currently available key rates and transmission distances of two-way CVQKD. The proposed scalar reconciliation can also be applied in oneway systems as well, to replace the existing reconciliation schemes.

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“…[10] where Alice sends squeezed states along one of the two quadratures and Bob performs homodyne detection. The security of the latter follows from a continuousvariable version of the entropic uncertainty principle [11] while that of the former protocol is established thanks to a recently developed Gaussian de Finetti theorem [12,13], [43].Establishing the security of two-way CVQKD, where Alice and Bob send quantum information back and forth through the channel, has been an outstanding goal in the field and partial progress was obtained in Refs [14][15][16][17][18][19][20][21]. However, to the best of our knowledge, none of these works has proven its security against general attacks in the composable setting.…”

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confidence: 99%

Composable security of two-way continuous-variable quantum key distribution without active symmetrization

Ghorai¹,

Diamanti²,

Leverrier

2019

Phys. Rev. A

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We present a general framework encompassing a number of continuous-variable quantum key distribution protocols, including standard one-way protocols, measurement-device-independent protocols as well as some two-way protocols, or any other continuous-variable protocol involving only a Gaussian modulation of coherent states and heterodyne detection. The main interest of this framework is that the corresponding protocols are all covariant with respect to the action of the unitary group U (n), implying that their security can be established thanks to a Gaussian de Finetti reduction. In particular, we give a composable security proof of two-way continuous-variable quantum key distribution against general attacks. We also prove that no active symmetrization procedure is required for these protocols, which would otherwise make them prohibitively costly to implement.Quantum key distribution (QKD) allows two distant parties, Alice and Bob with access to an untrusted quantum channel and an authenticated classical channel, to share a secret key which can later be used to encrypt classical messages. The remarkable property of QKD is that its security can be established in the informationtheoretic setting, without appealing to any computational assumptions. While the first protocols relied on a discrete encoding of information and required singlephoton detectors [1, 2], a new generation of protocols called "continuous-variable" (CV) encode the information on the quadratures of the quantized electromagnetic field, allowing coherent detection to advantageously replace single-photon detection [3]. There is, however, a price to pay for this simplified experimental setup and this is increased difficulty of establishing security proofs due to the fact that the finite-dimensional Hilbert space of discrete-variable QKD has to be replaced by an infinite-dimensional Fock space. Notably, the theoretical tools developed for analyzing discrete-variable protocols -de Finetti theorems [4][5][6], entropic uncertainty relations [7], entropy accumulation [8] -need not directly work in the CV setting.Fortunately, some of these proof techniques have been successfully adapted to continuous variables and two oneway CVQKD protocols are now established to be secure against general attacks. These are the no-switching protocol [9] where Alice sends coherent states with a Gaussian modulation and Bob performs heterodyne (or dualhomodyne) detection, and the BB84-inspired protocol of Ref. [10] where Alice sends squeezed states along one of the two quadratures and Bob performs homodyne detection. The security of the latter follows from a continuousvariable version of the entropic uncertainty principle [11] while that of the former protocol is established thanks to a recently developed Gaussian de Finetti theorem [12,13], [43].Establishing the security of two-way CVQKD, where Alice and Bob send quantum information back and forth through the channel, has been an outstanding goal in the field and partial progress was obtained in Refs [14][15][16][17][18][19][...

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Security of a New Two-Way Continuous-Variable Quantum Key Distribution Protocol

Cited by 31 publications

References 40 publications

Continuous-variable measurement-device-independent quantum key distribution with virtual photon subtraction

Continuous-variable measurement-device-independent quantum key distribution with virtual photon subtraction

Long-distance continuous-variable quantum key distribution with advanced reconciliation of a Gaussian modulation

Composable security of two-way continuous-variable quantum key distribution without active symmetrization

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