33 results about "Quantum Fourier transform" patented technology

A method of data compression and transmission include splitting a wave function representative of an input data set into an arbitrarily oriented elliptical polarization state and a comparator wave function state, the comparator wave function state being transmitted to a detector. A quantum Fourier transform is performed on the arbitrarily oriented elliptical polarization state to yield a quantum computational product. A quantum Hadamard transform is performed on the quantum computational product to yield one of two possible quantum particle outputs. The input data set is reconstructed based upon the coincident arrival of the comparator wave function state and one of the two quantum particle outputs. A method is performed on either a quantum computer or a digital computer. An optical bench with appropriate electronics is particularly well suited to function as a quantum computer for the compression and transmission of data corresponding to sound.

The invention provides a palm print database search method based on quantum algorithms. Four different quantum algorithms are respectively used in the three most important stages of palm print recognition. The search method comprises the following steps that 1, a palm print image is filtered by a quantum adaptive median filtering algorithm, and a fact can be observed from a filtering effect contrast chart that a better filtering effect can be obtained by the quantum adaptive median filtering algorithm utilized in the invention than a classic algorithm; 2, the characters of the palm print image are extracted by quantum Fourier conversion based on quantum parallelism, all palm print characters can be extracted by only one quantum Fourier conversion operation, and an analysis result shows that the extraction speed of the palm print characters is raised by the algorithm under the condition of well reserving palm print details; and 3, the palm print image is matched by a quantum set operation and a Grover algorithm. In comparison with the classic algorithm which requires N times of operation, the matching algorithm provided by the invention has the advantage that the position of the target palm print image can be found by only 1 / 2 N times of operation, and the probability of finding the position of the target image in the palm print database by the algorithm is close to 1.

The invention provides a safety multiparty quantum summation method based on quantum Fourier transform, wherein a transmission particle is transmitted in a tree form. A participant responsible for preparing initial quantum state is assumed to be semi-loyal, so that the participant can wrongly act by following own will but cannot conspire with the others. The method provided by the invention is capable of resisting against the external attack and the participant attack. Especially, one participant cannot acquire the secrete integer sequences of the other participants. The method provided by the invention is safe for the conspired attack applied by at most n-2 participants, wherein n is the number of the participants. Besides, according to the method provided by the invention, the module d is calculated and the summation is calculated in the manner of integer adding integer rather than the manner of bit adding bit.

The invention discloses a segmentation method for a multi-quantum-bit quantum Fourier transform line. The invention provides a multi-bit quantum Fourier transform line segmentation method, and mainly solves the problem that an existing small-scale quantum computer cannot operate a large-scale multi-bit quantum Fourier transform line due to insufficient quantum bits. According to the scheme, the method comprises the following steps: performing line adjustment on a quantum Fourier transform line, and dividing the adjusted line into a plurality of sub-lines; initial quantum state preparation and measurement module setting are respectively performed on the input and output of each sub-circuit to form a plurality of sub-quantum circuits, and the sub-quantum circuits are operated on a small-scale quantum computer; and performing classical calculation on the operation results of all the sub-quantum circuits so as to restore the operation results into the operation result of the original large-scale quantum Fourier transform circuit. According to the method, projection measurement of part of sub-lines is optimized, the number of quantum lines running on a quantum computer is reduced, the width of the quantum lines is effectively reduced through quantum-classical hybrid calculation, and the method can be used for phase estimation of multiple quantum bits in quantum communication and quantum calculation.

A system for use in quantum encryption, decryption, and encoding, comprises a photon production sub-system, a transmission channel sub-system, and a data encoding sub-system. The transmission channel sub-system makes use of the combination of quantum state vectors derived from the photon production sub-system for optical communication with quantum key. The data encoding sub-system includes a plurality of dynamic data encoding modules, and at least one of these modules performs to express the quantum key with bases in an individual Hilbert Space, and divides the transmitting data into segments for data encoding with the individual space bases. In addition to the use in data encoding, the sub-system can also improve the signal-decays and the eavesdropping issue within the quantum channel via implementation of the Laplace Transformation unit and the Quantum Fourier Transformation unit.

The invention discloses a security multi-party quantum summation consultation method based on quantum Fourier transform, wherein transmitted particles are transmitted in a complete graph mode. The method disclosed by the invention can resist to an external attack and a participant attack. Particularly, a participant in a non-minimum subset cannot successfully and separately decide a shared summation calculation result. In addition, according to the method disclosed by the invention, a module d is calculated, and both calculation and summation are carried out in a mode of adding integers and integers instead of a mode of adding bits and bits.

The invention relates to an efficient and practical quantum secret sharing method based on a d-level single particle. A secret distributor prepares a d-level single particle and uses it as an information carrier for circular transmission between each participant. Each participant encodes its sub-secret into the signal particle through a local unitary operation without quantum storage, which improves the practicability of the scheme. The quantum Fourier transform is used to construct two mutually unbiased ground states on the d-level quantum system, and the quantum unclonability is combined to ensure the unconditional security of the scheme in theory. In the present invention, one d-level particle can share two classical bits, and the number of particles required for wiretapping detection is reduced through a combined wiretapping detection method, so as to ensure that the scheme obtains higher quantum efficiency.

The invention provides a method for realizing quantum circuit design through quantum Fourier transform and belongs to the field of circuit design. A conventional quantum Fourier transform implementation technology is perfected and improved with the method due to the fact that a Bit Reverse circuit is absent in conventional quantum Fourier transform implementation circuits. Four quantum Fourier transform implementation circuits are constructed by an extended tensor product and basic quantum bit gates including quantum bit controlled gates and single quantum bit gates; on the basis of analysis for complexity of the quantum Fourier transform implementation circuits, complexity of the four quantum Fourier transform implementation circuits is theta(n<2>) in terms of a data set comprising 2<n> elements, which cannot be achieved by any other classic fast Fourier transform. The method is suitable for many application fields of actual information processing, for instance, efficient Fourier transform is required for algorithms of image compression, denoising, encryption, decryption and the like, and the method has great significance in perfection of the quantum computing theory and popularization of application.

The invention discloses a user agent-based cloud quantum privacy query method. The method includes: using a database to negotiate with the user agent through classical channels to obtain a first shared key; using the database to encrypt the quantum state sequence generated according to the key to generate the first mixed key The sequence is transmitted to the cloud service provider; the cloud service provider performs quantum entrusted calculation on the first mixed sequence to generate the second mixed sequence and transmits it to the user agent; the user agent decrypts the second mixed sequence to generate the third mixed sequence and transmits it to the querying user A group; use the query user to decrypt the third mixed sequence to obtain the query quantum state, and perform quantum privacy query according to the obtained query quantum state. The present invention implements double encryption on the entire entrusted encryption process by means of cloud server entrusted encryption calculation, and improves the efficiency of the entire quantum transmission by utilizing the advantage of quantum Fourier transform to transmit multiple quantum keys at one time.

The present invention relates to a finite-field discrete logarithm quantum solution circuit optimization construction method, comprising: constructing an addition carry gate circuit for finite-field discrete logarithms, so as to realize equivalent conversion of multiplication cyclic group generators; setting the addition carry gate Auxiliary bits, and realize recursively performing the operation of the addition carry gate through the addition quantum circuit; use the addition carry gate circuit to perform the comparison operation, and judge the carry information when the quantum register and the constant are added, so as to realize the optimization of the modulo N addition quantum circuit; through the modulo N The addition operation realizes the multiplication operation, and constructs the modular N multiplication quantum circuit; realizes the modular exponentiation operation through the modular N multiplication operation, and constructs the modular exponentiation quantum circuit; combines the modular exponentiation quantum circuit and the existing quantum Fourier transform quantum circuit, constructs and realizes the finite field A quantum algorithm circuit for solving discrete logarithms. The invention realizes the modular addition process through the logic quantum circuit, reduces the calculation amount and complexity of the logarithm solution, reduces the calculation load of software and hardware, and has strong application prospects.

The invention provides a safety multiparty quantum summation method based on quantum Fourier transform, wherein a transmission particle is transmitted in a tree form. A participant responsible for preparing initial quantum state is assumed to be semi-loyal, so that the participant can wrongly act by following own will but cannot conspire with the others. The method provided by the invention is capable of resisting against the external attack and the participant attack. Especially, one participant cannot acquire the secrete integer sequences of the other participants. The method provided by the invention is safe for the conspired attack applied by at most n-2 participants, wherein n is the number of the participants. Besides, according to the method provided by the invention, the module d is calculated and the summation is calculated in the manner of integer adding integer rather than the manner of bit adding bit.

The invention provides a quantum stealth transfer system classification method based on a Schmidt rank relationship. The method comprises the following steps: step 1, selecting two states as a first entangled state and a second entangled state respectively; step 2, taking the first entangled state as a pre-transmission entangled state, taking the second entangled state as an entangled state of thequantum channel, taking the Schmidt rank of the pre-transmission entangled state as nI, taking the Schmidt rank of the entangled state of the quantum channel as nC, and taking the Schmidt rank of a total subsystem formed by the pre-transmission entangled state and the quantum channel; step 3, if the Schmidt rank meets the condition that nC is greater than or equal to nI, executing the step 4; otherwise, reselecting two states from the entangled states as a first entangled state and a second entangled state, and executing the step 2; and step 4, if nS is equal to nI, obtaining a projection measurement base and a unitary transformation matrix through linear transformation; and if nS is equal to knI, obtaining a projection measurement base and a unitary transformation matrix in a quantum Fourier transformation mode. According to the method, a projection measurement base and a unitary transformation matrix are obtained through linear transformation and quantum Fourier transformation respectively.

The invention belongs to the technical field of image processing, and relates to a remote sensing image denoising method based on quantum Fourier transform, which aims to improve the remote sensing image denoising speed on the premise of ensuring that the denoising effect is not reduced, and comprises the following steps of: 1) performing quantization coding on an airspace remote sensing image; 2)performing quantum Fourier transform on each spatial domain quantum remote sensing image in a quantum computer; 3) performing quantum filtering on each frequency domain quantum remote sensing image in a quantum computer; and 4) obtaining a denoising result of each airspace remote sensing image in the quantum computer. According to the method, a QImR encoding method and quantum Fourier transform are adopted, so that a large number of pixel values in the remote sensing image can be stored in a small number of quantum bits and can be calculated at the same time, the time complexity is reduced, meanwhile, a quantum filtering function is adopted to suppress high-frequency signals, and therefore, on the premise that the noise suppression capability of the remote sensing image is not affected, denoising efficiency is raised.

The application relates to a quantum-based batch identity authentication method, system, device and storage medium. The method includes: user A and user B share a key key with a length of m through a quantum key distribution protocol; user A prepares a set of random single photon sequences, and uses high-dimensional quantum Fourier transform to process the single photon sequences Encryption, the sequence of single photons is obtained after quantum Fourier transform; user B performs a set of operations on the sequence based on the key in turn to obtain execution particles, and hands the execution particles to user C; user C according to the measurement The particles in the sequence are calculated to obtain the first identity information, user A calculates the second identity information according to the single photon sequence, and when the first identity information and the second identity information are equal, the identity authentication of user B passes. The invention saves the time of identity authentication and improves the efficiency and precision of identity authentication.