Abstract
Quantum mechanics allows measurements that surpass the fundamental sensitivity limits of classical methods. To benefit from the quantum advantage in a practical setting, the receiver should use communication channels resources optimally; this can be done employing large communication alphabets. Here we show the fundamental sensitivity potential of a quantum receiver for coherent communication with frequency shift keying. We introduce an adaptive quantum protocol for this receiver, show that its sensitivity outperforms other receivers for alphabet sizes above 4 and scales favorably, whereas quantum receivers explored to date suffer from degraded sensitivity with the alphabet size. In addition, we show that the quantum measurement advantage allows the much better use of the frequency space in comparison to classical frequency keying protocols and orthogonal frequency division multiplexing.
Highlights
Long-distance communication with light dates to at least 1184 BCE, when a series of fire beacons were used to signal the fall of Troy over 600 kilometers [1]
Coherent states corresponding to coherent frequency shift keying (CFSK) symbols rotate with time around the origin of the diagram with rates given by their detuning
We have introduced an optical energy efficient quantum receiver that experiences no degradation with increasing alphabet size
Summary
Long-distance communication with light dates to at least 1184 BCE, when a series of fire beacons were used to signal the fall of Troy over 600 kilometers [1]. Coherent states are currently the information carriers of choice These states are naturally resilient to losses and can reliably carry information through amplitude, phase, and/or frequency modulation [13]. Modern communication protocols have evolved to use large alphabets consisting of up to a few thousand symbols [25, 26], which significantly improves the transfer rate and spectral capacity of a communication channel. Quantum receivers that discriminate as many as 4 coherent states with error rates below the SQL have been experimentally demonstrated [31, 32]. The quantum measurement advantage can significantly optimize the use of frequency space in comparison to classical frequency keying, continuous phase modulation protocols, and orthogonal frequency division multiplexing (OFDM) [13]
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