54 results about "Quantum walk" patented technology

The invention belongs to the technical field of quantum communication, and discloses a semi-quantum group signature method and system based on quantum walk, and the method comprises the steps: carrying out the group internal communication through employing a semi-quantum communication mode; using a quantum walking-based mode to carry out communication outside a group, entangled particles being automatically generated in a walking process, and transmitting a communication message by adopting a quantum walking-based invisible transmission state; when the distributed information is signed by group members, performing blind processing on the message by using a certain coding rule, so that the blind information is not acquired by other group members and external potential attackers; and carrying out anti-repudiation, anti-denial, anti-forgery, interception retransmission attack and entanglement attack security analysis on the blind information. According to the method, single-photon-based information transmission is adopted for communication in the group, so that quantum preparation and detection are relatively easy, and the communication cost is greatly saved in the actual applicationprocess.

The invention relates to an image encryption method based on on-ring two particle one-dimensional discrete quantum walk. The purpose is to guarantee safety and high efficiency of an image encryption algorithm and effectively protect an image. The method includes the steps that (1), on-ring two particle one-dimensional discrete quantum walk is used for generating a secrete key matrix; the on-ring two particle one-dimensional discrete quantum walk is operated to generate probability distribution which is converted to a secrete key sequence S, and the sequence S is converted into a matrix P; (2), the image is encrypted, logic exclusive or is performed on the matrix P and the original image I to generate a mixed image E, M values and N values are randomly and respectively selected from the sequence S, so that a sequence X and a sequence Y are respectively obtained, and ascending sort is performed on the two sequences to respectively obtain two new sequences. The two new sequences IX and IY are used for rearranging the encrypted image E to obtain a final encrypted image E'. Compared with an existing image encryption method, the image encryption method is easier to operate, higher in speed, better in performance and encryption quality and capable of meeting practical needs better.

The invention discloses a method for constructing a quantum hash function based on controlled alternate quantum walks on a two-dimensional plane. Based on the proposed controlled alternate quantum walks, an information sequence is used to control coin throwing operations, the controlled alternate quantum walks are used to achieve a unidirectional compression process of quantum hash, and the probability obtained by measuring the location of a walker are used as original data and then processed as a hash value. The method adopts the controlled alternate quantum walks, and controls the walks on the two-dimensional plane with a two-dimensional coin. Thus, the method not only avoids a predictable collision behavior in a previous quantum hash mechanism, but also facilitates the physical experiment. A reliable and practical quantum hash mechanism is realized.

The invention discloses a traffic flow characteristic modal decomposition method based on a generation-filtering mechanism, and the method comprises the steps: firstly enabling a high-speed traffic flow to serve as a closed traffic system, enabling each driver to serve as an independent particle according to the randomness of the drivers, simulating a path track, and calculating the probability distribution of the track according to the probability distribution of the track under different parameters; obtaining a corresponding traffic mode; secondly, taking different quantum random walk parameters, obtaining time evolution of traffic flow probability distribution caused by different driving modes on the stations, and then transforming the different stations to form the high-speed traffic flow mode set; and finally, screening the generated traffic modes according to the actually observed traffic flow data, and inverting to obtain the mode structure of the traffic flow. The complex structure and multi-modal characteristics of the traffic flow are disclosed from the perspective of multi-scale decomposition, a certain reference is provided for traffic management, prediction and regulation, and the method has great significance in solving various traffic problems faced by the current society.

The present systems, devices, and methods generally relate to generating families of symbol sequences with controllable degree of correlation within and between them using quantum computers, and particularly to the exploitation of this capability to generate families of symbol sequences representing musical events such as, but not limited to, musical notes, musical chords, musical percussion strikes, musical time intervals, musical note intervals, and musical key changes that comprise a musical composition. Quantum random walks on graphs representing allowed transitions between musical events are also employed in some implementations.

The invention discloses a behavior trajectory sequence multi-feature simulation method based on quantum walk. The method comprises the following steps: (1) generating a complete set feature sequence; (2) screening a feature sequence; (3) constructing a feature sequence mapping mechanism; (4) executing the experimental verification. According to the method, on the basis of conversion combination characteristics between individual behaviors and group behaviors, the feature structures of similar individuals are simulated from the perspective of multi-scale analysis by utilizing quantum migration, and behavior tracks are simulated.

The invention provides a quantum privacy comparison method and system based on one-way quantum walking and a storage medium, and in the method, a semi-honest third party assists two non-trusted participants to complete comparison. When a particle sequence is transmitted between the two parties, decoy particles are inserted to detect whether a listener exists or not, a positive evolution operator and an inverse evolution operator are used for encryption, private information of a participant is coded, and QWs state measurement is carried out on the final particle sequence to obtain a measurement result. And comparing the size of the first privacy information of the first participant with the size of the second privacy information of the second participant based on the measurement result of the walking state in the measurement results. According to the method, the safety and the efficiency are improved.

The invention discloses a robust image watermarking method based on quantum random walk and discrete wavelet transform, and aims to improve robustness and select to embed watermarks in a frequency domain. The discrete wavelet transform has the advantages that the discrete wavelet transform has good discreteness and spatial locality; important information in the image is compressed through discrete cosine transform, and the important information is concentrated and stepwise on the upper left portion of a coefficient matrix. The SVD coefficients provide high robustness, visual quality, and data payload. Second-level discrete wavelet transform is applied to a carrier image, and watermark embedding is completed in a high-frequency coefficient HH2 of the carrier image, so that the robustness of the watermark is ensured, and better visual quality of the carrier image is kept. After 2-DWT is carried out on a carrier image, the carrier image is divided into blocks, DCT operation is carried out on each block, and main energy of the image is further extracted. In order to not influence the visual quality as far as possible, the watermarking is embedded in the alternating current coefficient, and the watermarking is embedded into the singular value of the block by performing singular value decomposition on the watermarking.