Figure 2From: Quantum-enhanced receiver for quadrature phase shift keying using conjugated homodyne detectionThe schematic of a CHD quantum-enhanced receiver for discriminating QPSK coherent states. CW, continuous-wave; IM, intensity modulator; OC, optical coupler; PM, phase modulator; MOVA, manual optical variable attenuator; S, signal; LO, local oscillator; FPGA, field programmable gate array; DAC, digital-to-analog converterBack to article page