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A quantum communication device based on multiple entanglement sideband modes

A technology of quantum communication and mode, applied in the fields of quantum information science and quantum optics, can solve problems such as the inability of quantum communication, and achieve the effect of avoiding crosstalk effect and improving channel capacity.

Active Publication Date: 2021-03-30
SHANXI UNIV
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Problems solved by technology

However, in the current schemes and experiments, there is no effective scheme for the stable control and spatial separation of entangled sideband modes. The entangled sideband modes of different frequencies cannot be separated in space, and quantum communication for large-scale users cannot be carried out. Therefore, there is an urgent need for a scalable and spatially separated entangled sideband pattern preparation scheme

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  • A quantum communication device based on multiple entanglement sideband modes
  • A quantum communication device based on multiple entanglement sideband modes
  • A quantum communication device based on multiple entanglement sideband modes

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Embodiment Construction

[0026] The scheme of this application only uses a single quantum squeeze light source, combined with a classical filter optical cavity to perform spatial separation of multi-entangled sideband modes, and demonstrates a channel multiplexing quantum communication scheme. Multiple sets of control loops are used to lock the length of the corresponding filter cavity, and the spatial separation of multiple pairs of entangled sideband modes can be prepared simultaneously.

[0027] figure 1 It is a principle block diagram of the present invention, and the coherent laser system 1 outputs a relatively high-power low-noise laser, which is used to prepare the required compressed light, auxiliary light and local oscillator light. Squeezed light and auxiliary light interfere to produce multi-sideband entanglement, and the filter cavity is used to separate the positive sideband modes in space, which changes the current situation of using local oscillator light of corresponding frequency to d...

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Abstract

The invention discloses a quantum communication device based on a multi-entangled sideband mode. The device comprises a coherent laser system, a quantum compression light source, an auxiliary light preparation system, a positive sideband filtering system, a negative sideband filtering system, an information coding system, a local oscillation light preparation system and a balance zero-beat detection system. According to the device, quantum communication is carried out by using an entanglement mode pair, and due to the entanglement characteristic of signals encoded and decoded by each user, thequantum communication has very high security, and the communication capacity and the signal-to-noise ratio of a quantum channel can break through the corresponding granular noise limitation.

Description

technical field [0001] The invention relates to the fields of quantum information science and quantum optics technology, in particular to a quantum communication device based on a multi-entanglement sideband mode. Background technique [0002] In the subject of continuous variable quantum information, squeezed state light field and entangled state light field are one of the most important nonclassical light fields. The entangled light field can be prepared by interfering two squeezed light fields on a 50:50 beam splitter. In addition, the entangled light field can also be prepared based on the symmetric sideband mode of the squeezed light field. In the past few decades, after continuous exploration by theoretical physicists and experimental physicists, quantum information science, such as quantum dense coding (QDC), quantum key distribution, and quantum teleportation, are moving closer to practical applications The direction of development, saving quantum resources, increas...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04B10/63
CPCH04B10/63H04B10/70
Inventor 田龙李庆回郑耀辉王雅君
Owner SHANXI UNIV
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