Device for detecting strong light in transmitting end of quantum communication system

Abstract

The invention provides a device for detecting strong light in a transmitting end of a quantum communication system. The device comprises a laser; the light source driving unit is configured to drive the laser to output light pulses; an optical coding unit configured to prepare quantum light including information to be transmitted using the optical pulse output by the laser; the circulator comprises a first port, a second port and a third port and is configured to transmit the quantum light incident from the first port to the second port so as to emit the quantum light to a receiving end corresponding to the emitting end and transmit the external strong light incident from the second port to the third port at the same time; the photoelectric detector is configured to detect the light intensity of incident light of the external strong light output from the third port; and a controller configured to perform a predetermined protection operation for the quantum communication system in response to the detected incident light intensity reaching a reference threshold. The device provided by the invention can effectively detect the attack light possibly existing in the transmitting end of the quantum communication system.

Description

technical field [0001] The present invention relates to the technical field of quantum communication, in particular to a device for detecting strong light in a transmitting end of a quantum communication system (such as a quantum key distribution system). Background technique [0002] At present, the quantum communication system is still subject to various attacks from the outside during its operation. For example, the transmitter of the quantum communication system may be attacked by an external Trojan horse. This attack performs injection locking by injecting strong light into the transmitter. To obtain the optical coding information of the transmitter, this will not only lead to the leakage of the optical coding information to the attacker, but also cause damage to various devices and circuits used in the quantum communication system. Contents of the invention [0003] The object of the present invention is to provide a device for detecting strong light in the transmitt...

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Problems solved by technology

[0002] At present, the quantum communication system is still subject to various attacks from the outside during its operation. For example, the transmitter of the quantum communication system may be attacked by an external Trojan horse. This attack performs injection locking by injecting strong light into the transmitter. To obtain the optical coding information at the transmitter, this will not only cause the optical coding information to be leaked to the attacker, but also cause damage to various devices and circuits used in the quantum communication system

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