Communication linker for communication linking

A process for performing communication linking, the process comprising:

• producing an encoded signal;
• receiving the encoded signal from a first time to a second time;
• producing, by an optical transmitter, a transmitter signal in response to receiving the encoded signal, the transmitter signal being based on the encoded signal;
• receiving, by a receiver, the transmitter signal;
• producing, by a signal processor, a feedback signal;
• producing, by a local oscillator, a displacement frequency, based on the feedback signal;
• receiving, by the receiver, the displacement frequency from the local oscillator;
• interfering, on a beam splitter of the receiver, the transmitter signal with the displacement frequency, and:
• producing, by the receiver, an optical signal comprising an optical state with a nonzero mean photon number when:
• the transmitter signal has a different frequency than the displacement frequency, or
• the transmitter signal has a different phase than a phase of the displacement frequency;
• and
• not producing, by the receiver, the optical signal comprising the photon when:
• the transmitter signal and the displacement frequency have a same frequency and a same phase;
• receiving, by a single photon detector, the optical signal from the receiver;
• producing, by the single photon detector, a single photon detector signal, based on the optical signal, such that:
• when the optical signal comprises the photon, an amplitude of the single photon detector signal is greater than a threshold amplitude;
• and
• otherwise the amplitude of the single photon detector signal is less than the threshold amplitude;
• receiving, by a signal processor, the single photon detector signal from the single photon detector;
• determining, by the signal processor, an amplitude of the single photon detector signal, and:
• changing the feedback signal if the single photon detector signal is greater than the threshold amplitude;
• and
• maintaining the feedback signal if the single photon detector signal is less than the threshold amplitude;
• and
• producing, by the signal processor, at the second time a decoded signal comprising a frequency of the feedback signal to link communications between the optical transmitter and the receiver.