Microwave quantum illumination with a digital phase-conjugated receiver Barzanjeh, Shabir ; https://orcid.org/0000-0003-0415-1423 Pirandola, Stefano Vitali, David Fink, Johannes M ; https://orcid.org/0000-0001-8112-028X Quantum illumination is a sensing technique that employs entangled signal-idler beams to improve the detection efficiency of low-reflectivity objects in environments with large thermal noise. The advantage over classical strategies is evident at low signal brightness, a feature which could make the protocol an ideal prototype for non-invasive scanning or low-power short-range radar. Here we experimentally investigate the concept of quantum illumination at microwave frequencies, by generating entangled fields using a Josephson parametric converter which are then amplified to illuminate a room-temperature object at a distance of 1 meter. Starting from experimental data, we simulate the case of perfect idler photon number detection, which results in a quantum advantage compared to the relative classical benchmark. Our results highlight the opportunities and challenges on the way towards a first room-temperature application of microwave quantum circuits. IEEE 2020 info:eu-repo/semantics/conferenceObject doc-type:conferenceObject text http://purl.org/coar/resource_type/c_5794 https://research-explorer.ista.ac.at/record/9001 Barzanjeh S, Pirandola S, Vitali D, Fink JM. Microwave quantum illumination with a digital phase-conjugated receiver. In: <i>IEEE National Radar Conference - Proceedings</i>. Vol 2020. IEEE; 2020. doi:<a href="https://doi.org/10.1109/RadarConf2043947.2020.9266397">10.1109/RadarConf2043947.2020.9266397</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1109/RadarConf2043947.2020.9266397 info:eu-repo/semantics/altIdentifier/issn/1097-5659 info:eu-repo/semantics/altIdentifier/isbn/9781728189420 info:eu-repo/semantics/altIdentifier/wos/000612224900089 info:eu-repo/semantics/altIdentifier/arxiv/1908.03058 info:eu-repo/semantics/openAccess