Quantum Enhanced Hazardous Substances Surveillance System

<div>Schematic of the optical module. LD: laser diode, IM: intensity modulator, BS: beam splitter, PBS: polarization beam splitter, FM: Faraday mirror, FR: faraday rotator, PM: phase modulator, CIR: optical circulator, VOA: variable optical attenuator, SM: single mode, and SPD: single-photon detector.</div>

Quantum Engineering

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Figure 2

Figure 2: Quantum Enhanced Hazardous Substances Surveillance System 