Quantum receiver for large alphabet communication

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.

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Cited by in corpus (6)

• Entanglement-Based Quantum Information Technology
• Quantum Limits in Optical Communications
• Robust Measurement for the Discrimination of Binary Coherent States
• Quantum Receiver Enhanced by Adaptive Learning
• Performance of Coherent Frequency-Shift Keying for Classical Communication \\ on Quantum Channels
• Indirect Measurement for Optimal Quantum Communication Enhanced by Binary Non-standard Coherent States