The article discusses a new communication linker technology developed by the United States, which includes a classical encoder, optical transmitter, receiver, local oscillator, single photon detector, and signal processor. The key innovation is a quantum coherent frequency shift keying (CFSK) receiver that improves upon traditional receivers by using quantum displacement measurements in a frequency-phase space rather than amplitude-phase space.
This new receiver technology offers several benefits:
– Lower discrimination error probability compared to traditional receivers
– Compatibility with existing global fiber networks
– Increased amplification-free range
– Reduced transmitter power requirements
– Potential for reduced frequency band usage compared to classical protocols
– Compatibility with current alphabet sizes
– No increase in power-per-bit requirements with alphabet size
The technology has applications in optical communication channels, including fiber and free space, and could significantly improve the performance and efficiency of digital communications systems.
Source: https://www.nist.gov/patents/communication-linker-communication-linking
Keywords: Quantum, Coherent, Frequency, Displacement, Photon
