Terahertz wave communication device based on quantum two-photon entanglement

A technology of terahertz waves and communication devices, which is applied in the field of terahertz optoelectronics, can solve problems such as interception and decoding, achieve smooth communication transmission, have great application prospects, and improve security and confidentiality

Inactive Publication Date: 2014-04-30
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the existing terahertz communication technology, when the terahertz wave carrier carrying communication code information is transmitted between the transmitting device and the receiving device, it is easily subject to random interference from the external

Method used

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  • Terahertz wave communication device based on quantum two-photon entanglement
  • Terahertz wave communication device based on quantum two-photon entanglement
  • Terahertz wave communication device based on quantum two-photon entanglement

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Embodiment Construction

[0022] See figure 1 In this embodiment, the pump light source 1 selects an electro-optical Q-switched pulsed Nd:YAG laser.

[0023] Electro-optic Q-switched pulse Nd: Fundamental frequency light of YAG laser 1 (wavelength is λ P =1064nm) as the pump light source, the polarization direction of the pump light is parallel to MgO: LiNbO 3 The Z axis direction of crystal 5.

[0024] After the pump light passes through the half-wave plate 2 and the polarization beam splitter 3, it is condensed by a convex lens 4 with a focal length of f to form pump light with a spherical wave surface, and then enters MgO: LiNbO 3 Crystal 5 (doping concentration is 5% mol). By rotating the half-wave plate 2, the incident to MgO: LiNbO is controlled 3 The pump light energy in the crystal 5 produces non-degenerate two-photon entangled terahertz photons 6 (wavelength λ T ) And Stokes Photon 11 (wavelength is λ S ), respectively as two communication channels (hereinafter referred to as terahertz photon commun...

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Abstract

The invention discloses a terahertz wave communication device based on quantum two-photon entanglement. The terahertz wave communication device comprises a pump light source, a half-wave plate, a polarization beam splitter, a convex lens, an MgO:LiNbO3 crystal, an information space encoder, a terahertz photon collection lens, a narrow-band filter, a terahertz single-photon detector, a single-photon counter, a coincidence measurement device and an information space decoder. Pump light emitted out from the pump light source is converged through the convex lens so as to stimulate the MgO:LiNbO3 crystal to generate a terahertz photon communication channel with the entanglement property and a stokes photon communication channel with the entanglement property. The information space encoder, the terahertz photon collection lens, the narrow-band filter and the terahertz single-photon detector are placed on the terahertz photon communication channel. The single-photon counter is placed on the stokes photon communication channel. Quanta output by the terahertz single-photon detector and quanta output by the single-photon counter enter the coincidence measurement device along with mechanical and electrical pulse signals, and original communication information is reproduced by utilizing the information space decoder.

Description

Technical field [0001] The invention relates to the technical field of terahertz optoelectronics, in particular to a terahertz wave communication device based on quantum two-photon entanglement. Background technique [0002] Terahertz wave is an electromagnetic wave with a wavelength in the range of 30μm-3mm, and its waveband is between far infrared and microwave. Terahertz waves have high penetrability to most non-polar materials, sand and dust, plastic polymers, wood, paper, semiconductor materials, etc., and the energy of terahertz wave photons is only 1 / the energy of X-ray photons. 10 6 , Will not produce harmful ionization to biological tissues, so terahertz wave technology has been widely used in security inspections, weapon guidance, space communications, anti-terrorism, biomedical imaging and other application technologies. [0003] With the development of high-speed wireless communication technology and people's increasing requirements for large-capacity and high-speed t...

Claims

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Application Information

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IPC IPC(8): H04B10/70
Inventor 孙博田方白先鹏
Owner NORTHWEST UNIV
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