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Four-state continuous variable quantum key distribution method and system of local oscillator

A quantum key distribution, local technology, applied in the field of four-state continuous variable quantum key distribution, can solve the problems of increasing complexity, reducing system security, and taking a long time, and achieving the effect of reducing operational complexity

Inactive Publication Date: 2021-06-01
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the four-state modulation described in this method requires that the phase between the signal light and the local oscillator light strictly satisfy 0, π, angle, which will increase the complexity of the operation in the actual preparation process; at the same time, the code rate estimation of this method adopts the method of numerical simulation of convex optimization algorithm, the calculation process of this method will take a long time, and in the practical process will Leading to a reduction in efficiency, there is still room for optimization
In addition, in the technical field of quantum key distribution, signal light and local oscillator light are mostly sent and prepared by the sender, and local oscillator light will inevitably be affected by Eavesdropping and attacks, reducing the security of the system

Method used

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  • Four-state continuous variable quantum key distribution method and system of local oscillator
  • Four-state continuous variable quantum key distribution method and system of local oscillator
  • Four-state continuous variable quantum key distribution method and system of local oscillator

Examples

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Embodiment 1

[0079] Such as figure 2 As shown, this embodiment exemplarily provides an implementation of the above-mentioned four-state continuous variable quantum key distribution system of the local local oscillator, and the whole system includes a sending end and a receiving end.

[0080] The sending end includes a first continuous laser, a first intensity modulator and a phase modulator cascaded in sequence, which are respectively used to realize the functions of the signal light sending module, the signal light intensity modulation module and the phase modulation module, and the phase modulator passes through a single The mode fiber is connected to the receiving end.

[0081] The first CW laser is used to generate CW laser light which is stable in intensity, phase, frequency and polarization.

[0082] The first intensity modulator chops the continuous laser light with a certain intensity to obtain signal light pulses. Preferably, a fixed attenuator may be added after the first inte...

Embodiment 2

[0101] Such as image 3 As shown, in this embodiment, the transmitting end includes a CW laser, a first beam splitter and a first polarization maintaining polarization beam splitter, an intensity modulator, and a first phase modulator, wherein the CW laser, the first beam splitter and The first polarization maintaining polarization beam splitter together constitutes a signal light transmission module, the intensity modulator is used as a signal light intensity modulation module, and the first phase modulator is used as a signal light phase modulation module; the receiving end includes a dynamic polarization controller, a slave laser transmitter, A circulator, a second polarization-maintaining polarization beam splitter, a second to a fifth beam splitter, a first to a fourth detector, a first differential amplifier, a second differential amplifier, and a dynamic polarization controller as a signal light polarization compensation module, A local oscillator light sending module a...

Embodiment 3

[0112] Such as Figure 4 As shown, the change of Embodiment 3 compared with Embodiment 1 is that the intensity modulator in the signal light intensity modulation module at the sending end is replaced by the first circulator, the first beam splitter, the second phase modulator, the first An optical fiber delay line, wherein the first beam splitter, the second phase modulator and the first optical fiber delay line form a loop; the intensity modulator in the local oscillator light intensity modulation module at the receiving end is replaced by the second circulator, The second beam splitter, the third phase modulator and the second fiber delay line, wherein the second beam splitter, the third phase modulator and the second fiber delay line form a loop.

[0113] In the sending end: the first circulator transmits the continuous laser light generated by the first continuous laser to the first beam splitter from the first continuous laser in the direction specified by the first circu...

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Abstract

The invention provides a four-state continuous variable quantum key distribution method and system of a local oscillator. According to the invention, four-state modulation is used, but the phase between the signal light and the local oscillator light is not required to strictly meet the angle of 0, pi, but an additional fixed phase difference is allowed to exist within a period of time of coding and unconditionally safe coding rate estimation is given through a quasi-Newton algorithm. In addition, the system sends the local oscillation light through the receiving end, so that the local oscillation light can be prevented from going through a quantum channel and suffering additional attacks, so that higher safety is obtained.

Description

technical field [0001] The invention relates to the technical field of quantum key distribution, in particular to a four-state continuous variable quantum key distribution method and system of a local local oscillator. Background technique [0002] Quantum key distribution is the most mature direction in the field of quantum information. Compared with traditional cryptography, which relies on the computational complexity of algorithms, the unconditional security advantage of quantum key distribution technology is guaranteed by its quantum mechanical properties. Therefore, it has broad application prospects. Furthermore, quantum key distribution can be mainly divided into discrete variable quantum key distribution and continuous variable quantum key distribution. The former takes the BB84 protocol as a typical case, and encodes information on the degree of freedom of a single photon, so it can only carry One-bit quantum information, and the single-photon signal and channel n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/61
CPCH04L9/0819H04L9/0852H04B10/614H04B10/6162
Inventor 尹华磊高睿琪陈增兵
Owner NANJING UNIV
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