Journal
SCIENCE ADVANCES
Volume 6, Issue 19, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb0451
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Funding
- Institute of Science and Technology Austria (IST Austria)
- European Research Council [758053]
- E.U.'s Horizon 2020 research and innovation programme [862644, 732894]
- Marie Sklodowska Curie fellowship [707438]
- Project QuaSeRT - QuantERA ERANET Cofund in Quantum Technologies
- Austrian Science Fund (FWF) through BeyondC [F71]
- NOMIS foundation research grant
- European Research Council (ERC) [758053] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [707438] Funding Source: Marie Curie Actions (MSCA)
- Austrian Science Fund (FWF) [F71] Funding Source: Austrian Science Fund (FWF)
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Quantum illumination uses entangled signal-idler photon pairs to boost the detection efficiency of low-reflectivity objects in environments with bright thermal noise. Its advantage is particularly evident at low signal powers, a promising feature for applications such as noninvasive biomedical scanning or low-power short-range radar. Here, we experimentally investigate the concept of quantum illumination at microwave frequencies. We generate entangled fields to illuminate a room-temperature object at a distance of 1 m in a free-space detection setup. We implement a digital phase-conjugate receiver based on linear quadrature measurements that outperforms a symmetric classical noise radar in the same conditions, despite the entanglement-breaking signal path. Starting from experimental data, we also simulate the case of perfect idler photon number detection, which results in a quantum advantage compared with the relative classical benchmark. Our results highlight the opportunities and challenges in the way toward a first room-temperature application of microwave quantum circuits.
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