| CPC H04L 9/0858 (2013.01) [H04B 10/70 (2013.01)] | 20 Claims |
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1. A method for operating a continuous variable-quantum key distribution (CV-QKD) system comprising a CV-QKD transmitter and a CV-QKD receiver, the method comprising:
storing and transmitting, by the CV-QKD transmitter, a quantum signal over a communication channel, wherein the quantum signal has a first phase, a first central frequency, a first pulse shape, and a first bandwidth;
receiving, by the CV-QKD receiver, the quantum signal via the communication channel and via a reception band of the CV-QKD receiver, the reception band having a second central frequency and a second bandwidth, wherein the second central frequency is offset from the first central frequency by a frequency shift caused by the communication channel, wherein the received quantum signal has a second phase and a second pulse shape, wherein the second phase is offset from the first phase by a phase shift caused by the communication channel and the second pulse shape is offset from the first pulse shape by a delay caused by the communication channel;
determining, by the CV-QKD receiver, a quantum communication channel based on the phase shift, the frequency shift, the delay, and a third bandwidth resulting from an overlap between the first bandwidth around the first central frequency and the second bandwidth around the second central frequency;
communicating, by the CV-QKD receiver, the determined quantum communication channel to the CV-QKD transmitter over an authenticated communication channel;
obtaining, by the CV-QKD transmitter, a modified quantum signal by modifying the stored quantum signal based on the determined quantum communication channel; and
generating, by the CV-QKD transmitter and the CV-QKD receiver, a secret key using the modified quantum signal and the received quantum signal.
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