Artykuły w czasopismach: „Eavesdropping on the graph state”

1

Stuart, Jeffrey L. "The eavesdropping number of a graph". Czechoslovak Mathematical Journal 59, nr 3 (wrzesień 2009): 623–36. http://dx.doi.org/10.1007/s10587-009-0056-9.

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Serhiienko, S. P., V. G. Krizhanovski, D. V. Chernov i L. V. Zagoruiko. "The use of non-steady state noise interferences to counteract passive eavesdropping devices". Radiotekhnika, nr 207 (24.12.2021): 132–38. http://dx.doi.org/10.30837/rt.2021.4.207.14.

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The use of noise interference has become a common practice for information security. Recently appeared publications showing a potential possibility to use the noise radio frequency interference for information skimming by passive radio eavesdropping device. In particular, the vulnerability of the premises protected from eavesdropping devices is increased, if the radio frequency noising is switched on when confidential negotiations are being conducted. The use of radio noise waves energy for eavesdropping makes such devices invisible to nonlinear locators for listening devices if they activated only by noise signals. The paper shows that the use of non-steady state noise allows counteracting the unauthorized pickup of information. The analysis of non-steady state radio frequency noise effectiveness was carried out using the correlation receiver model. The correlation receiver has the highest sensitivity, and it works more efficiently with noise-like signals. It is shown that for counteracting the information pickup, it is necessary to use a noise, amplitude modulated by a random signal, whose spectrum coincides with a spectrum of a potential informational signal. Imposition a more powerful modulation noise to a weak informational signal makes impossible the information transfer. It is shown on the example of changing the power of a monochromatic signal while “beetle” transmits using steady-state and non-steady state noises, that due to the signal energy parametric redistribution over the non-steady-state noise modulation spectrum, the power of monochromatic signal is reduced by more than 10 dB compared to the transmission of the same signal using a steady-state noise. It can be concluded that the use of non-steady state noise signals for radio frequency suppression makes impossible their use for passive eavesdropping devices operation.

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3

Naik, D. S., C. G. Peterson, A. G. White, A. J. Berglund i P. G. Kwiat. "Entangled State Quantum Cryptography: Eavesdropping on the Ekert Protocol". Physical Review Letters 84, nr 20 (15.05.2000): 4733–36. http://dx.doi.org/10.1103/physrevlett.84.4733.

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YI, XIAO-JIE, JIAN-MIN WANG i GUO-QIANG HUANG. "SPLITTING QUANTUM INFORMATION WITH FIVE-ATOM ENTANGLED STATE IN CAVITY QED". International Journal of Quantum Information 08, nr 08 (grudzień 2010): 1289–99. http://dx.doi.org/10.1142/s0219749911007071.

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A realizable scheme is proposed for implementing quantum information splitting with five-atom entangled state in cavity QED, where we explicitly illustrate the procedure and analyze the security against the eavesdropping. The scheme does not involve Bell-state measurement and is insensitive to the cavity and the thermal field.

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WANG, JIAN, SHENG ZHANG, QUAN ZHANG i CHAO-JING TANG. "SEMIQUANTUM SECRET SHARING USING TWO-PARTICLE ENTANGLED STATE". International Journal of Quantum Information 10, nr 05 (sierpień 2012): 1250050. http://dx.doi.org/10.1142/s0219749912500505.

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We present a semiquantum secret sharing protocol by using two-particle entangled states in which quantum Alice shares a secret key with two classical parties, Bob and Charlie. Classical Bob and Charlie are restricted to measuring, preparing a particle in the computational basis, or reflecting the particles. None of them can acquire the secret unless they collaborate. We also show the protocol is secure against eavesdropping.

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Liu Jing-Feng, Tang Zhi-Lie, Liang Rui-Sheng, Li Ling-Yan, Wei Zheng-Jun, Chen Zhi-Xin, Liao Chang-Jun i Liu Song-Hao. "Eavesdropping on practical QKD system based on six-state protocol". Acta Physica Sinica 54, nr 2 (2005): 517. http://dx.doi.org/10.7498/aps.54.517.

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Cirac, J. I., i N. Gisin. "Coherent eavesdropping strategies for the four state quantum cryptography protocol". Physics Letters A 229, nr 1 (kwiecień 1997): 1–7. http://dx.doi.org/10.1016/s0375-9601(97)00176-x.

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CHEN, XIU-BO, TIAN-YIN WANG, JIAN-ZHONG DU, QIAO-YAN WEN i FU-CHEN ZHU. "CONTROLLED QUANTUM SECURE DIRECT COMMUNICATION WITH QUANTUM ENCRYPTION". International Journal of Quantum Information 06, nr 03 (czerwiec 2008): 543–51. http://dx.doi.org/10.1142/s0219749908003566.

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Utilizing a partially entangled GHZ state, we propose a novel controlled quantum secure direct communication (QSDC) with quantum encryption. Under the supervision and help of the third side, the sender and the receiver can securely share the private quantum entanglement keys used to encrypt and decrypt the secret message. According to the results of checking the eavesdropping on decoy photons, communicators can decide whether the quantum keys are reused in the next round. Not only will eavesdropping inevitably disturb the states of the decoy photons and be detected, but arbitrary transmission errors can also be corrected.

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Zaidi, Ali Mustafa, i David Greaves. "Value State Flow Graph". ACM Transactions on Reconfigurable Technology and Systems 9, nr 2 (3.02.2016): 1–22. http://dx.doi.org/10.1145/2807702.

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Bouajjani, A., J. C. Fernandez, N. Halbwachs, P. Raymond i C. Ratel. "Minimal state graph generation". Science of Computer Programming 18, nr 3 (czerwiec 1992): 247–69. http://dx.doi.org/10.1016/0167-6423(92)90018-7.

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Chen, Guihong, Xi Liu, Mohammad Shorfuzzaman, Ali Karime, Yonghua Wang i Yuanhang Qi. "MEC-Based Jamming-Aided Anti-Eavesdropping with Deep Reinforcement Learning for WBANs". ACM Transactions on Internet Technology 22, nr 3 (31.08.2022): 1–17. http://dx.doi.org/10.1145/3453186.

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Wireless body area network (WBAN) suffers secure challenges, especially the eavesdropping attack, due to constraint resources. In this article, deep reinforcement learning (DRL) and mobile edge computing (MEC) technology are adopted to formulate a DRL-MEC-based jamming-aided anti-eavesdropping (DMEC-JAE) scheme to resist the eavesdropping attack without considering the channel state information. In this scheme, a MEC sensor is chosen to send artificial jamming signals to improve the secrecy rate of the system. Power control technique is utilized to optimize the transmission power of both the source sensor and the MEC sensor to save energy. The remaining energy of the MEC sensor is concerned to ensure routine data transmission and jamming signal transmission. Additionally, the DMEC-JAE scheme integrates with transfer learning for a higher learning rate. The performance bounds of the scheme concerning the secrecy rate, energy consumption, and the utility are evaluated. Simulation results show that the DMEC-JAE scheme can approach the performance bounds with high learning speed, which outperforms the benchmark schemes.

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Peng, Yue Hong, Jia Wang Li, Jin Hao Liu i Yu Min Liu. "Influence of Path Attacks on Security of Six-State Scheme". Applied Mechanics and Materials 263-266 (grudzień 2012): 3114–19. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.3114.

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The safety of the six-state scheme in the practical communication systems was studied based on an effective eavesdropping method, which called path attacks adopted by eavesdroppers. In the practical systems, eavesdropper can select appropriate path to eavesdrop on legitimate users to obtain some information. This method will keep photon number distribution in the laser pulses, and the eavesdropper can be hidden by the losses of quantum channel without being detected. The results show that eavesdropper can get more information with the increase of transmission distance and the average number of photons.

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Bechmann-Pasquinucci, H., i N. Gisin. "Incoherent and coherent eavesdropping in the six-state protocol of quantum cryptography". Physical Review A 59, nr 6 (1.06.1999): 4238–48. http://dx.doi.org/10.1103/physreva.59.4238.

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Hao, Yuan, Liu Yin-Min, Zhang Wen i Zhang Zhan-Jun. "Eavesdropping on Quantum Secure Direct Communication with W State in Noisy Channel". Communications in Theoretical Physics 49, nr 1 (styczeń 2008): 103–6. http://dx.doi.org/10.1088/0253-6102/49/1/22.

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SHADMAN, Z., H. KAMPERMANN, T. MEYER i D. BRUß. "OPTIMAL EAVESDROPPING ON NOISY STATES IN QUANTUM KEY DISTRIBUTION". International Journal of Quantum Information 07, nr 01 (luty 2009): 297–306. http://dx.doi.org/10.1142/s0219749909004554.

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We study eavesdropping in quantum key distribution with the six state protocol, when the signal states are mixed with white noise. This situation may arise either when Alice deliberately adds noise to the signal states before they leave her lab, or in a realistic scenario where Eve cannot replace the noisy quantum channel by a noiseless one. We find Eve's optimal mutual information with Alice, for individual attacks, as a function of the qubit error rate. Our result is that added quantum noise reduces Eve's mutual information more than Bob's.

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Qin, Huawang, Wallace K. S. Tang i Raylin Tso. "Three-party quantum secret sharing based on d-dimensional Bell state". Modern Physics Letters B 33, nr 03 (30.01.2019): 1950023. http://dx.doi.org/10.1142/s0217984919500234.

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A three-party quantum secret sharing scheme is proposed, in which the dealer uses the d-dimensional Bell state to distribute the secret, the participants perform the single-particle measurements to get their shares, and the dealer performs the Bell-basis measurements to check the eavesdropping. The main merit of our scheme is that the participants only need to measure the particles in one basis. Compared to the existing schemes in which the participants need to measure the particles in two bases, our scheme will be more practical.

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17

Benjamin, Simon C., Daniel E. Browne, Joe Fitzsimons i John J. L. Morton. "Brokered graph-state quantum computation". New Journal of Physics 8, nr 8 (23.08.2006): 141. http://dx.doi.org/10.1088/1367-2630/8/8/141.

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Antonio, B., D. Markham i J. Anders. "Adiabatic graph-state quantum computation". New Journal of Physics 16, nr 11 (26.11.2014): 113070. http://dx.doi.org/10.1088/1367-2630/16/11/113070.

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Kalampakas, Antonios. "Graph Automata and Graph Colorability". European Journal of Pure and Applied Mathematics 16, nr 1 (29.01.2023): 112–20. http://dx.doi.org/10.29020/nybg.ejpam.v16i1.4629.

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Automata recognizing graphs can be constructed by employing the algebraic structure of graphoids. For the construction of a graph automaton, the relations over the Kleene star of the state set must constitute a graphoid. Hence different kinds of graphoids produce graph automata with diverse operation and recognition capacity. In this paper we show that graph colorability is recognized by automata operating over the simplest possible abelian graphoid.

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20

Fahmi, A. "New approach to quantum key distribution via quantum encryption". Quantum Information and Computation 9, nr 9&10 (wrzesień 2009): 879–98. http://dx.doi.org/10.26421/qic9.9-10-9.

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Recently, Zhang, Li and Guo (ZLG) suggested a new approach to quantum key distribution by using a shared Bell state which acts as quantum key in order to encode and decode classical information. Subsequently, others extended ZLG protocol to d-dimensional systems and to quantum secret sharing based on reusable GHZ states. However, Gao et al. have shown that if Eve employs a special strategy to attack, these protocols become insecure. Afterwards, they repair ZLG protocol so that their eavesdropping strategy becomes inefficient. In this paper, we investigate the security of ZLG quantum key distribution protocol and show that it is not secure against Eve's attacks and with probability of one half she gets all of the keys without being detected by the two parties. In this eavesdropping strategy, Eve transforms the previously shared Bell state between Alice and Bob to two Bell states among herself and the parties. Moreover, we briefly show that ZLG's repairing by Gao et al's is not efficient against of our attack and Eve can choose an appropriate rotation angle and measurement bases which help her to do eavesdropping. Afterwards, we discuss generalization of ZLG protocol to d-dimensional systems and show that with probability 1/d, Eve gets all of keys. We show that quantum secret sharing based on reusable GHZ states is also not secure and with probability one half, Eve gets all of keys. We repair them by going to higher dimensional shared EPR or GHZ states. Finally, we compare ZLG protocol with ours and show that the ZLG protocol and its extensions are less robust against the channel noise with respect to ours.

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Wang, Le, Xianghui Cao, Heng Zhang, Changyin Sun i Wei Xing Zheng. "Transmission scheduling for privacy-optimal encryption against eavesdropping attacks on remote state estimation". Automatica 137 (marzec 2022): 110145. http://dx.doi.org/10.1016/j.automatica.2021.110145.

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Cardoso-Isidoro, C., i F. Delgado. "Quantum Authentication Using Double Teleportation". Journal of Physics: Conference Series 2448, nr 1 (1.02.2023): 012018. http://dx.doi.org/10.1088/1742-6596/2448/1/012018.

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Abstract A process involving quantum teleportation to teleport a state to two parties in superposition is presented. Then, the process is applied to cryptography. Concretely in this work, we present the process of cryptography authentication using an undefined qubit state and the double quantum teleportation presented previously. Since quantum cryptography protocols are susceptible of eavesdropping, then such a process is considered through an eavesdropper trying to steal the information to supplant the user of authentication in order to quantify certain limits of applicability.

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Zawadzki, Piotr, i Jarosław Adam Miszczak. "A General Scheme for Information Interception in the Ping-Pong Protocol". Advances in Mathematical Physics 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3162012.

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The existence of undetectable eavesdropping of dense coded information has been already demonstrated by Pavičić for the quantum direct communication based on the ping-pong paradigm. However, (a) the explicit scheme of the circuit is only given and no design rules are provided; (b) the existence of losses is implicitly assumed; (c) the attack has been formulated against qubit based protocol only and it is not clear whether it can be adapted to higher dimensional systems. These deficiencies are removed in the presented contribution. A new generic eavesdropping scheme built on a firm theoretical background is proposed. In contrast to the previous approach, it does not refer to the properties of the vacuum state, so it is fully consistent with the absence of losses assumption. Moreover, the scheme applies to the communication paradigm based on signal particles of any dimensionality. It is also shown that some well known attacks are special cases of the proposed scheme.

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Hwang, Yongsoo, i Jun Heo. "On the relation between a graph code and a graph state". Quantum Information and Computation 16, nr 3&4 (marzec 2016): 237–50. http://dx.doi.org/10.26421/qic16.3-4-3.

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A graph state and a graph code respectively are defined based on a mathematical simple graph. In this work, we examine a relation between a graph state and a graph code both obtained from the same graph, and show that a graph state is a superposition of logical qubits of the related graph code. By using the relation, we first discuss that a local complementation which has been used for a graph state can be useful for searching locally equivalent stabilizer codes, and second provide a method to find a stabilizer group of a graph code.

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PIRANDOLA, STEFANO. "SYMMETRIC COLLECTIVE ATTACKS FOR THE EAVESDROPPING OF SYMMETRIC QUANTUM KEY DISTRIBUTION". International Journal of Quantum Information 06, supp01 (lipiec 2008): 765–71. http://dx.doi.org/10.1142/s0219749908004080.

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We consider the collective eavesdropping of the BB84 and six-state protocols. Since these protocols are symmetric in the eigenstates of conjugate bases, we consider collective attacks having the same kind of symmetry. We then show how these symmetric collective attacks are sufficiently strong in order to minimize the Devetak–Winter rates. In fact, it is quite easy to construct simple examples able to reach the unconditionally secure key rates of these protocols.

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Liao, Longxia, Xiaoqi Peng, Jinjing Shi i Ying Guo. "Graph state-based quantum authentication scheme". International Journal of Modern Physics B 31, nr 09 (10.04.2017): 1750067. http://dx.doi.org/10.1142/s0217979217500679.

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Inspired by the special properties of the graph state, a quantum authentication scheme is proposed in this paper, which is implemented with the utilization of the graph state. Two entities, a reliable party, Trent, as a verifier and Alice as prover are included. Trent is responsible for registering Alice in the beginning and confirming Alice in the end. The proposed scheme is simple in structure and convenient to realize in the realistic physical system due to the use of the graph state in a one-way quantum channel. In addition, the security of the scheme is extensively analyzed and accordingly can resist the general individual attack strategies.

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Katayama, H., i A. Ichikawa. "Pole assignment by state transition graph". IEEE Transactions on Automatic Control 37, nr 8 (1992): 1196–201. http://dx.doi.org/10.1109/9.151103.

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Kauffman, Louis H. "A state calculus for graph coloring". Illinois Journal of Mathematics 60, nr 1 (2016): 251–71. http://dx.doi.org/10.1215/ijm/1498032032.

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Marzuola, Jeremy L., i Dmitry E. Pelinovsky. "Ground State on the Dumbbell Graph". Applied Mathematics Research eXpress 2016, nr 1 (2016): 98–145. http://dx.doi.org/10.1093/amrx/abv011.

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Li, Yipeng, Xiaogang Liu i Shenggui Zhang. "Laplacian state transfer in Q-graph". Applied Mathematics and Computation 384 (listopad 2020): 125370. http://dx.doi.org/10.1016/j.amc.2020.125370.

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Sandhir, Radha Pyari. "State-independent quantum key distribution with two-way classical communication". Quantum Information and Computation 19, nr 15&16 (grudzień 2019): 1279–93. http://dx.doi.org/10.26421/qic19.15-16-2.

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A quantum key distribution protocol is proposed that is a variation of BB84 that provides raw key generation from correlations that violate a Bell-type inequality for single qubit systems and not entangled pairs. Additionally, it 1) is state-independent, 2) involves two-way classical communication, and 3) does not require basis matching between the two parties. The Brukner-Taylor-Cheung-Vedral (BTCV) time-like form of the Bell-CHSH inequality by Bruk and by Tay is employed as an eavesdropping check; sequential measurements lead to an inequality identical in form to the Bell-CHSH inequality, which relies only on the measurements performed with no regard for the qubit states. We show that this form manifests naturally from the non-commutativity of observables.

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ACÍN, ANTONIO, NICOLAS GISIN, LLUIS MASANES i VALERIO SCARANI. "BELL'S INEQUALITIES DETECT EFFICIENT ENTANGLEMENT". International Journal of Quantum Information 02, nr 01 (marzec 2004): 23–31. http://dx.doi.org/10.1142/s0219749904000043.

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We review the status of Bell's inequalities in quantum information, stressing mainly the links with quantum key distribution and distillation of entanglement. We also prove that for all the eavesdropping attacks using one qubit, and for a family of attacks of two qubits, acting on half of a maximally entangled state of two qubits, the violation of a Bell inequality implies the possibility of an efficient secret-key extraction.

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Cai, Deng, i Wai Lam. "Graph Transformer for Graph-to-Sequence Learning". Proceedings of the AAAI Conference on Artificial Intelligence 34, nr 05 (3.04.2020): 7464–71. http://dx.doi.org/10.1609/aaai.v34i05.6243.

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The dominant graph-to-sequence transduction models employ graph neural networks for graph representation learning, where the structural information is reflected by the receptive field of neurons. Unlike graph neural networks that restrict the information exchange between immediate neighborhood, we propose a new model, known as Graph Transformer, that uses explicit relation encoding and allows direct communication between two distant nodes. It provides a more efficient way for global graph structure modeling. Experiments on the applications of text generation from Abstract Meaning Representation (AMR) and syntax-based neural machine translation show the superiority of our proposed model. Specifically, our model achieves 27.4 BLEU on LDC2015E86 and 29.7 BLEU on LDC2017T10 for AMR-to-text generation, outperforming the state-of-the-art results by up to 2.2 points. On the syntax-based translation tasks, our model establishes new single-model state-of-the-art BLEU scores, 21.3 for English-to-German and 14.1 for English-to-Czech, improving over the existing best results, including ensembles, by over 1 BLEU.

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Liu, Chenghua, Zhuolin Liao, Yixuan Ma i Kun Zhan. "Stationary Diffusion State Neural Estimation for Multiview Clustering". Proceedings of the AAAI Conference on Artificial Intelligence 36, nr 7 (28.06.2022): 7542–49. http://dx.doi.org/10.1609/aaai.v36i7.20719.

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Although many graph-based clustering methods attempt to model the stationary diffusion state in their objectives, their performance limits to using a predefined graph. We argue that the estimation of the stationary diffusion state can be achieved by gradient descent over neural networks. We specifically design the Stationary Diffusion State Neural Estimation (SDSNE) to exploit multiview structural graph information for co-supervised learning. We explore how to design a graph neural network specially for unsupervised multiview learning and integrate multiple graphs into a unified consensus graph by a shared self-attentional module. The view-shared self-attentional module utilizes the graph structure to learn a view-consistent global graph. Meanwhile, instead of using auto-encoder in most unsupervised learning graph neural networks, SDSNE uses a co-supervised strategy with structure information to supervise the model learning. The co-supervised strategy as the loss function guides SDSNE in achieving the stationary state. With the help of the loss and the self-attentional module, we learn to obtain a graph in which nodes in each connected component fully connect by the same weight. Experiments on several multiview datasets demonstrate effectiveness of SDSNE in terms of six clustering evaluation metrics.

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Yang, Chunxin, Ryan P. Scott, David J. Geisler, Nicolas K. Fontaine, Jonathan P. Heritage i S. J. Ben Yoo. "Four-State Data Encoding for Enhanced Security Against Upstream Eavesdropping in SPECTS O-CDMA". Journal of Lightwave Technology 29, nr 1 (styczeń 2011): 62–68. http://dx.doi.org/10.1109/jlt.2010.2090129.

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Adcock, Jeremy C., Sam Morley-Short, Axel Dahlberg i Joshua W. Silverstone. "Mapping graph state orbits under local complementation". Quantum 4 (7.08.2020): 305. http://dx.doi.org/10.22331/q-2020-08-07-305.

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Graph states, and the entanglement they posses, are central to modern quantum computing and communications architectures. Local complementation – the graph operation that links all local-Clifford equivalent graph states – allows us to classify all stabiliser states by their entanglement. Here, we study the structure of the orbits generated by local complementation, mapping them up to 9 qubits and revealing a rich hidden structure. We provide programs to compute these orbits, along with our data for each of the 587 orbits up to 9 qubits and a means to visualise them. We find direct links between the connectivity of certain orbits with the entanglement properties of their component graph states. Furthermore, we observe the correlations between graph-theoretical orbit properties, such as diameter and colourability, with Schmidt measure and preparation complexity and suggest potential applications. It is well known that graph theory and quantum entanglement have strong interplay – our exploration deepens this relationship, providing new tools with which to probe the nature of entanglement.

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ANGELES-CANUL, RICARDO JAVIER, RACHAEL M. NORTON, MICHAEL C. OPPERMAN, CHRISTOPHER C. PARIBELLO, MATTHEW C. RUSSELL i CHRISTINO TAMON. "QUANTUM PERFECT STATE TRANSFER ON WEIGHTED JOIN GRAPHS". International Journal of Quantum Information 07, nr 08 (grudzień 2009): 1429–45. http://dx.doi.org/10.1142/s0219749909006103.

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This paper studies quantum perfect state transfer on weighted graphs. We prove that the join of a weighted two-vertex graph with any regular graph has perfect state transfer. This generalizes a result of Casaccino et al.1 where the regular graph is a complete graph with or without a missing edge. In contrast, we prove that the half-join of a weighted two-vertex graph with any weighted regular graph has no perfect state transfer. As a corollary, unlike for complete graphs, adding weights in complete bipartite graphs does not produce perfect state transfer. We also observe that any Hamming graph has perfect state transfer between each pair of its vertices. The result is a corollary of a closure property on weighted Cartesian products of perfect state transfer graphs. Moreover, on a hypercube, we show that perfect state transfer occurs between uniform superpositions on pairs of arbitrary subcubes, thus generalizing results of Bernasconi et al.2 and Moore and Russell.3

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Bechmann-Pasquinucci, H., i N. Gisin. "Bell inequality for quNits with binary measurements". Quantum Information and Computation 3, nr 2 (marzec 2003): 157–64. http://dx.doi.org/10.26421/qic3.2-6.

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We present a generalized Bell inequality for two entangled quNits. On one quNit the choice is between two standard von Neumann measurements, whereas for the other quNit there are N^2 different binary measurements. These binary measurements are related to the intermediate states known from eavesdropping in quantum cryptography. The maximum violation by \sqrt{N} is reached for the maximally entangled state. Moreover, for N=2 it coincides with the familiar CHSH-inequality.

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Qian, Pengzhi, Yu Zhang, Xiaojuan Yan, Yong Chen i Yifu Sun. "A Robust Scheme for RIS-Assisted UAV Secure Communication in IoT". Electronics 12, nr 11 (2.06.2023): 2507. http://dx.doi.org/10.3390/electronics12112507.

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Reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicles (UAV) have been extensively studied on the Internet of Things (IoT) systems to improve communication performance. In this paper, we aimed to counter simultaneous jamming and eavesdropping attacks by jointly designing an active beamforming vector at the base station (BS) and reflect phase shifts at the RIS. Specifically, considering imperfect angular channel state information (CSI), the sum secrecy rate maximization problem in the worst case could be formulated, which is NP-hard and non-convex. To address this problem, we improved the robust enhanced signal-to-leakage-and-noise ratio (E-SLNR) beamforming to reduce the computational complexity and mitigate the impact of interference, eavesdropping and jamming. Furthermore, a genetic algorithm with a tabu search (GA-TS) method was proposed to efficiently obtain an approximate optimal solution. The simulation results demonstrated that the proposed GA-TS method converged faster with better results than conventional GA, while the proposed robust scheme could achieve higher sum secrecy rates than the zero-forcing (ZF) and SLNR schemes.

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Coutinho, Gabriel, i Chris Godsil. "Perfect state transfer is poly-time". Quantum Information and Computation 17, nr 5&6 (kwiecień 2017): 495–502. http://dx.doi.org/10.26421/qic17.5-6-8.

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KAWASAKI, Yosuke, i Masaki TAKAHASHI. "World state dependent action graph based on knowledge representation using scene graph". Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2022 (2022): 1A1—T08. http://dx.doi.org/10.1299/jsmermd.2022.1a1-t08.

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42

Brown, John, Chris Godsil, Devlin Mallory, Abigail Raz i Christino Tamon. "Perfect state transfer on signed graphs". Quantum Information and Computation 13, nr 5&6 (maj 2013): 511–30. http://dx.doi.org/10.26421/qic13.5-6-10.

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We study perfect state transfer of quantum walks on signed graphs. Our aim is to show that negative edges are useful for perfect state transfer. First, we show that the signed join of a negative $2$-clique with any positive $(n,3)$-regular graph has perfect state transfer even if the unsigned join does not. Curiously, the perfect state transfer time improves as $n$ increases. Next, we prove that a signed complete graph has perfect state transfer if its positive subgraph is a regular graph with perfect state transfer and its negative subgraph is periodic. This shows that signing is useful for creating perfect state transfer since no complete graph (except for the $2$-clique) has perfect state transfer. Also, we show that the double-cover of a signed graph has perfect state transfer if the positive subgraph has perfect state transfer and the negative subgraph is periodic.Here, signing is useful for constructing unsigned graphs with perfect state transfer. Finally, we study perfect state transfer on a family of signed graphs called the exterior powers which is derived from a many-fermion quantum walk on graphs.

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43

Li, Jian, HaiFei Jin i Bo Jing. "Improved eavesdropping detection strategy based on four-particle cluster state in quantum direct communication protocol". Chinese Science Bulletin 57, nr 34 (20.11.2012): 4434–41. http://dx.doi.org/10.1007/s11434-012-5516-1.

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Li, Jian, Hai-Fei Jin i Bo Jing. "Improved Eavesdropping Detection Strategy in Quantum Direct Communication Protocol Based on Five-Particle Cluster State". International Journal of Theoretical Physics 51, nr 9 (19.04.2012): 2759–70. http://dx.doi.org/10.1007/s10773-012-1151-5.

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45

Liao, Longxia, Xiaoqi Peng, Jinjing Shi i Ying Guo. "Graph State-Based Quantum Group Authentication Scheme". Journal of the Physical Society of Japan 86, nr 2 (15.02.2017): 024403. http://dx.doi.org/10.7566/jpsj.86.024403.

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Herrera-Marti, David A., i Terry Rudolph. "Loss tolerance with a concatenated graph state". Quantum Information and Computation 13, nr 11&12 (listopad 2013): 995–1006. http://dx.doi.org/10.26421/qic13.11-12-6.

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A new way of addressing loss errors is introduced which combines ideas from measurement-based quantum computation and concatenated quantum codes, allowing for universal quantum computation. It is shown that for the case where qubit loss is detected upon measurement, the scheme performs well under $23\%$ loss rate. For loss rates below $10\%$ this approach performs better than the best scheme known up to date \cite{varnava2006loss}. If lost qubits are tagged prior to measurement, it can tolerate up to $50\%$ loss. The overhead per logical qubit is shown to be significantly lower than other schemes. The obtention of the threshold is entirely analytic.

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Hajdušek, M., i M. Murao. "Direct evaluation of pure graph state entanglement". New Journal of Physics 15, nr 1 (17.01.2013): 013039. http://dx.doi.org/10.1088/1367-2630/15/1/013039.

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Tian, Yu-Ling, Tian-Feng Feng i Xiao-Qi Zhou. "Collaborative quantum computation with redundant graph state". Acta Physica Sinica 68, nr 11 (2019): 110302. http://dx.doi.org/10.7498/aps.68.20190142.

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Zambon, Eduardo, i Arend Rensink. "Graph Subsumption in Abstract State Space Exploration". Electronic Proceedings in Theoretical Computer Science 99 (23.10.2012): 35–49. http://dx.doi.org/10.4204/eptcs.99.6.

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Kaur, Hargeet, i Atul Kumar. "An Improved Ping-Pong Protocol Using Three-Qubit Nonmaximally Nonorthogonal Entangled States". Zeitschrift für Naturforschung A 74, nr 9 (25.09.2019): 799–811. http://dx.doi.org/10.1515/zna-2018-0448.

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AbstractWe analyse the ping-pong (PP) protocol [K. Bostrom and T. Felbinger, Phys. Rev. Lett. 89, 187902 (2002)] using different sets of partially entangled three-qubit states. Interestingly, our results show that the partially entangled nonorthogonal three-qubit states are more useful as resources in comparison to three-qubit maximally entangled Greenberger–Horne–Zeilinger (GHZ) states. The properties of orthogonal set of partially entangled states as resources for PP protocol, however, are similar to that of maximally entangled GHZ states – both the states are not preferable due to the vulnerability towards eavesdropping. On the other hand, partially entangled nonorthogonal basis set holds importance for transferring two-bit information, one each from a sender, to a single receiver. The protocol is further analysed for various eavesdropping attacks, and the results are compared with the use of two shared Bell pairs for two-bit information transfer. Surprisingly, the use of partially entangled nonorthogonal set of states is found to offer better qubit efficiency and increased security, as against the use of two separate maximally entangled Bell states with orthogonal basis. In addition, we also propose a mixed-state sharing protocol to further enhance the security of the PP protocol.

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