MDI-QKD system and MDI-QKD method

A public measurement and laser technology, applied in the field of quantum communication, can solve problems such as complex system structure, high-speed coding application limitations, and limited device performance levels, and achieve the effect of reducing usage and simplifying structure

Active Publication Date: 2017-05-10
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing MDI-QKD system realizes complex or limited device performance level for the Alice and Bob two-way optical wavelength calibration technology; the implementation of the quantum state preparation process and the decoy state scheme is realized by external modulation devices, the system structure is complex, and high-speed coding applications Restricted by external modulation devices; the existing MDI-QKD system still has a Trojan horse attack vulnerability

Method used

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Embodiment 1

[0061] The present invention is based on the theory of injection-locked semiconductor lasers. The concept of injection-locked was first proposed by R. Adler in 1946, and then K. Kurokawa explained the physical model and mathematical theory of injection-locked. When an oscillator is injected with a reference signal, when certain conditions are met between the power and frequency of the injected reference signal and the intrinsic frequency of the oscillator, the injected reference signal causes the oscillator to undergo stimulated radiation, and the stimulated radiation consumes The carriers in the resonant cavity of the oscillator saturate the optical gain in the resonant cavity, the intrinsic lasing of the oscillator is suppressed, and the frequency of the outgoing light becomes the frequency of the stimulated radiation light, that is, the frequency of the oscillator is due to the injection of the reference signal And re-stabilize on the frequency of the injected signal, and th...

Embodiment 2

[0100] Embodiment 1 adopts the three-state MDI-QKD protocol, and in this embodiment, the four-state phase-time coding is applied to the MDI-QKD protocol, as follows:

[0101] The MDI-QKD system structure of the present embodiment (as Figure 5 shown) is basically the same as Embodiment 1, the difference is that a phase modulator PM is added between the slave laser LD1 / LD2 and the adjustable optical attenuator VOA at the user end for the preparation of the phase-encoded quantum state. The functions realized by other devices are the same as those in Embodiment 1.

[0102]The four quantum states prepared by the MDI-QKD system in this embodiment include two short pulse pair intensity distribution states of |01> and |10> in Example 1, and their corresponding relationship with bit values ​​0 and 1 are the same as in Example 1 The same, the preparation process is also the same as that of Example 1; it also includes |0>, |π> quantum states of the internal phase difference of two shor...

Embodiment 3

[0114] In embodiment 1, the system passes through the synchronization module ( figure 2 Not shown in ) to control two short pulses excited from the lasers LD1 and LD2 can arrive at the beam splitter 3 for interference at the same time. This embodiment provides an example of this synchronization module, as Figure 7 shown. Because the synchronization of the two optical signals of Alice and Bob is mainly affected by the difference between the two long-distance separated quantum channels 1 and 2, the circular path is constructed to make the optical signal of Alice at the user end pass through the quantum channel 1 and quantum channel 2. 2. The optical signal of Bob at the user end also passes through quantum channel 1 and quantum channel 2, so the influence of the path difference on synchronization can be avoided.

[0115] Such as Figure 7 As shown, path selection module A and path selection module B are respectively added in user end Alice and Bob to connect the walking path...

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Abstract

The invention discloses an MDI-QKD system and an MDI-QKD method. The MDI-QKD system comprises two clients and a public measurement terminal, the public measurement terminal is provided with a master laser, the two clients are separately provided with slave lasers corresponding to the master laser, and the public measurement terminal is further provided with a detection module used for receiving optical signals from the lasers. A quantum state preparation process of the MDI-QKD system is an internal modulation process that is realized by two master and slave lasers together based on the photoinjection locking idea and has essential defense to the Trojan Horse attack. The first condition for the realization of the Trojan horse attack is that each modulation device for preparing a quantum state in a QKD system structure is independent from a light source and is an external modulation device, while no external modulation device is deployed in the quantum state preparation process of the MDI-QKD system, the quantum state preparation process is realized in the light source, and thus the realization condition of the Trojan Horse attack is damaged.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to an MDI-QKD system and method. Background technique [0002] Quantum key distribution (QKD) in principle provides unconditional security based on the laws of quantum physics rather than computational complexity, however, due to the gap between the theoretical assumptions of security proofs and realistic conditions, practical QKD systems are vulnerable to various attacks. The measurement subsystem is the most vulnerable part of the QKD system. On complex measurement devices such as decoding modules and single-photon detectors, other dimensions associated with the encoding dimension can leak information as side channels. In 2012, the Hoi-Kwong Lo group in Canada proposed the measurement device-independent quantum key distribution (MDI-QKD) protocol, which closed all the loopholes in the measurement subsystem and doubled the distance of secure communication. . [0003] The MDI-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/524H04B10/80H04L9/08
CPCH04B10/503H04B10/524H04B10/80H04L9/0819H04L9/0852
Inventor 富尧王真真
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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