Shanghai Maritime University

Rigui Zhou

Ganbin Wang

Ruiqing Xu

Rirong Zhou

Wenwen Hu

Ping Fan

Yaochong Li

The present invention discloses a high-fidelity entangled link generation method based on quantum time-space, the method comprising: directing, by a communication provider, a laser beam to a nonlinear crystal, thereby enabling probabilistically bursting out of a photon beam, and polarizing the photon beam to be in an entangled state; at an entanglement distribution stage, enabling entangled photons to traverse through quantum trajectories, and generating a distributed entangled photon state between a first communication node and a second communication node to construct an elementary entangled link; the first communication node or the second communication node is required to select the same measurement basis for m control qubits when m copies of entangled photon pairs from entanglement source are assumed to be distributed through quantum trajectories to communication nodes with the time interval τ, such that 2m memory qubits of two adjacent nodes may store m exactly the same distributed entangled states.

High-fidelity entangled link generation method based on quantum time-space

Disclosed are a quantum color image encrypting method based on modification direction and corresponding circuit, respectively providing quantum modular circuits design for a parallel adder, a parallel subtractor, a comparator, a cyclic shift add 1, and a cyclic shift subtract 1; and based on these modular circuits, circuit for implementing quantum color image steganography is provided. From the complexity analysis of implementing quantum circuit for color image steganography, it is seen that for a two-dimensional quantum color image with 2pixels and the R, G, and B channels of which are respectively represented by q number of quantum bits, the steganography algorithm is an efficient transformation method, and the circuit complexity is O(q+n), which can hardly be achieved by classical geometric transformation. The disclosure is applicable for many practical image processing applications, e.g., transmitting secrete data via a public image; they all need an effective and secure steganography algorithm; besides, the present disclosure is significant in perfection and applications of image processing theories.

Quantum color image encrypting method and circuit based on modification direction

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Shanghai, China

Rigui Zhou