High-capacity quantum secret sharing method based on photon orbital angular momentum encoding

Abstract

The invention discloses a high-capacity quantum secret sharing method based on photon orbit angular momentum coding. The method comprises the steps: constructing two unitary operators; giving two groups of complete intrinsic quantum states; carrying out annular quantum secret sharing communication. Based on an intrinsic quantum state space, transmitter side Alice randomly prepares a photon sequence and transmits the photon sequence to Bob. Bob randomly selects verification photons from the photon sequence for measurement described in the specification. The coding of the residual photons is carried out according to a secret key character string, and the coded photons are transmitted to Charlie. Charlie carries out measurement of photon verification of the received photon sequence, and codes the residual photons according to the secret key character string, and transmits the coded photons to Alice. Alice judges whether a communication channel is safe or not, and reads the coding operation which is carried out by Bob and Charlie jointly. The method employs single-photon orbit angular momentum coding to improve the communication capacity and frequency spectrum efficiency of a quantum secret sharing scheme, and does not need multicomponent entangled photon states.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a quantum secret sharing method based on high-dimensional coding of photon orbital angular momentum. Background technique [0002] The classic secret sharing scheme is implemented in three parties. One of the parties, as the dominant party, needs to distribute the encryption key to two receivers. Since there may be an untrusted party, the receivers need to join forces to read the encryption key. Existing quantum secret sharing schemes are based on single-photon polarization encoding. In order to realize quantum secret information sharing, the sender of the information uses two-component or three-component entangled photons as information bits, and then transmits the entangled photons through optical fibers or free space to the receiver. Both parties go through safety monitoring, and then randomly select the measurement base. Useful results can be obtai...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortage of low channel transmission capacity in the existing quantum secret sharing scheme, and design a high-capacity quantum secret sharing scheme that uses photon orbital angular momentum to realize information encoding and decoding

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