Method and apparatus for stabilizing quantum cryptographic key distribution
AssigneeId Quantique SA
InventorsJang Myun Kim, Jeong Sik Cho
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Abstract
The present disclosure in some embodiments provides a method and an apparatus for providing a quantum cryptographic key distribution stabilization, which can quickly and efficiently compensate for an error caused by a temperature change, a change in polarization of a transmission path of an optical system included in a quantum cryptographic key distribution system in a cost-effective manner working perfectly with the very conventional quantum cryptographic key distribution system.
Claims13
An apparatus for quantum cryptographic key distribution stabilization, comprising a processor, wherein said processor is configured to:
- generate a negative feedback signal by using a first count value of detections that are discarded without being used for a cryptographic key generation from among photon detection-related values generated by a receiver;
- calculate a correction value for an error to be compensated for upon receiving the negative feedback signal;
- and
- transmit the correction value to a transmitter or a receiver and to cause the transmitter and/or the receiver to control at least one variation factor that affects an object to be stabilized, thereby stabilizing the object, and
- wherein the processor is configured to generate the negative feedback signal by using a second count value of detections that are discarded due to the receiver having a receiver basis information which does not match a transmitter basis information of the transmitter.
An apparatus for quantum cryptographic key distribution stabilization, comprising a processor, wherein said processor is configured to:
- generate a negative feedback signal by using a first count value of detections that are discarded without being used for a cryptographic key generation from among photon detection-related values generated by a receiver;
- calculate a correction value for an error to be compensated for upon receiving the negative feedback signal;
- and
- transmit the correction value to a transmitter or a receiver and to cause the transmitter and/or the receiver to control at least one variation factor that affects a phase to thereby stabilize the phase, and
- wherein the processor is configured to generate the negative feedback signal by using a second count value of detections that are discarded due to the receiver having a receiver basis information which does not match a transmitter basis information of the transmitter.
An apparatus for quantum cryptographic key distribution stabilization, comprising a processor, wherein said processor is configured to:
- generate a negative feedback signal by using a first count value of detections that are discarded without being used for a cryptographic key generation from among photon detection-related values generated by a receiver;
- calculate a correction value for an error to be compensated for upon receiving the negative feedback signal;
- and
- transmit the correction value to a transmitter or a receiver and to cause the transmitter and/or the receiver to control at least one variation factor that affects a polarization to thereby stabilize the polarization, and
- wherein the processor is configured to generate the negative feedback signal by using a second count value of detections that are discarded due to the receiver having a receiver basis information which does not match a transmitter basis information of the transmitter.
Dependencies are inferred from the claim text.