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Quantum secure direct communication method based on photon orbital angular momentum coding

A technology of secure direct communication and orbital angular momentum, applied in the field of quantum communication, can solve problems such as direct communication without quantum security, and achieve the effect of improving communication capacity and spectrum efficiency

Active Publication Date: 2015-07-29
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At present, researchers have begun to use photon orbital angular momentum to carry out research in the quantum key distribution scheme, and use photon orbital angular momentum to realize encoding and complete the secure transmission of keys; but it has not been applied to quantum secure direct communication to realize information direct transfer of

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  • Quantum secure direct communication method based on photon orbital angular momentum coding
  • Quantum secure direct communication method based on photon orbital angular momentum coding
  • Quantum secure direct communication method based on photon orbital angular momentum coding

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Embodiment Construction

[0028] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0029] The core of the invention is to use the photon orbital angular momentum, an electromagnetic wave parameter dimension, for quantum safe direct communication, and use the photon orbital angular momentum to improve the spectrum communication efficiency and capacity of the quantum safe direct communication system.

[0030] The present invention realizes the quantum safe direct communication method based on photon orbital angular momentum encoding, and the device based on it includes two parts, an encoding module and a decoding module, wherein the encoding module is as follows: figure 2 Shown; the decoding module is the reverse process of the encoding module.

[0031] 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...

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Abstract

The invention discloses a quantum secure direct communication method based on photon orbital angular momentum coding, comprising the following steps: constructing two unitary operators and giving two groups of complete intrinsic quantum states; when quantum secure direct communication is carried out, based on an intrinsic quantum state space, randomly preparing, by a receiving party, a group of photon sequences, and sending to a sending party; randomly choosing, by the sending party, a check photon from the photon sequences to measure Z<^>p or X<^>p and comparing a measurement basis and a measurement result by a public channel; judging whether a communication channel is secure according to an error rate of the measurement result; if the channel is secure, carrying out coding operation on the photons by the sending party; measuring the received photons by the receiving party, comparing an initial state and a final state of a photon orbital angular momentum, obtaining the coding operation carried out by the sending party and constructing coded logic bit information sent by the sending party. According to the method disclosed by the invention, by using the photon orbital angular momentum coding, the communication capacity and the spectral efficiency of the quantum secure direct communication are improved.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a quantum safe direct communication method realized based on photon orbital angular momentum coding. Background technique [0002] Existing quantum-safe direct communication schemes are based on polarization encoding of single photons, or polarization encoding of entangled photons. In order to realize the safe and direct transmission of quantum information, the sender of the information uses a single photon to encode a qubit, and then transmits the qubit through optical fiber or free space to the receiver. The two parties have undergone safety monitoring, so that the quantum information can be directly read out in the photon bits. The information here is directly encoded in the polarization degree of freedom of the photon, or the phase degree of freedom. Since the polarization degree of freedom and the phase degree of freedom of the photon are two-dimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0852
Inventor 王川王铁军米丝辰
Owner BEIJING UNIV OF POSTS & TELECOMM
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