High-capacity quantum secret sharing method based on photon orbit angular momentum coding

A technology of orbital angular momentum and quantum secrets, which is applied in the field of quantum secret sharing, can solve the problem of low channel transmission capacity, and achieve the effects of strong realizability, improved communication capacity and spectral efficiency, and high efficiency

Active Publication Date: 2015-08-05
BEIJING UNIV OF POSTS & TELECOMM
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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 s

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  • High-capacity quantum secret sharing method based on photon orbit angular momentum coding
  • High-capacity quantum secret sharing method based on photon orbit angular momentum coding
  • High-capacity quantum secret sharing method based on photon orbit angular momentum coding

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Embodiment Construction

[0032] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0033] The core of the invention is to use the electromagnetic wave parameter dimension of photon orbital angular momentum in the quantum secret sharing scheme, and use the photon orbital angular momentum to improve the spectrum communication efficiency and capacity of the quantum secret sharing system.

[0034] figure 1 It is an orbital angular momentum separator, which can realize the manipulation of orbital angular momentum in two-dimensional space. figure 1 Middle: CPBS means circularly polarized beam splitter, PBS means polarized beam splitter, R means mirror, DP means Dove prism. The photon quantum state at the entrance of the orbital angular momentum separator can be denoted as Where |H> indicates that the polarization of the photon is in the state of horizontal polarization, and |l> indicates that the value of the orbital angular momentum o...

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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 realized based on photon orbital angular momentum high-dimensional coding. Background technique [0002] The classic secret sharing scheme is implemented among three parties, one of which is the dominant party and needs to distribute the encryption key to two receivers. Since there may be an untrusted party, the receivers need to unite to read the encryption key. Existing quantum secret sharing schemes are based on polarization encoding of single photons. In order to realize quantum secret information sharing, the sender of information uses two-component or three-component entangled photons as information bits, and then transmits the entangled photons through optical fiber or free space to the receiver. The two parties undergo security monitoring, and then randomly select the measurement base. Useful results can be obtai...

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Application Information

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IPC IPC(8): H04L9/08
Inventor 王川王铁军
Owner BEIJING UNIV OF POSTS & TELECOMM
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