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.
Barzanjeh S, Pirandola S, Vitali D, Fink JM. Microwave quantum illumination using a digital receiver. Science Advances. 2020;6(19). doi:10.1126/sciadv.abb0451
Barzanjeh, S., Pirandola, S., Vitali, D., & Fink, J. M. (2020). Microwave quantum illumination using a digital receiver. Science Advances, 6(19). https://doi.org/10.1126/sciadv.abb0451
Barzanjeh, Shabir, S. Pirandola, D Vitali, and Johannes M Fink. “Microwave Quantum Illumination Using a Digital Receiver.” Science Advances 6, no. 19 (2020). https://doi.org/10.1126/sciadv.abb0451.
S. Barzanjeh, S. Pirandola, D. Vitali, and J. M. Fink, “Microwave quantum illumination using a digital receiver,” Science Advances, vol. 6, no. 19, 2020.
Barzanjeh S, Pirandola S, Vitali D, Fink JM. 2020. Microwave quantum illumination using a digital receiver. Science Advances. 6(19).
Barzanjeh, Shabir, et al. “Microwave Quantum Illumination Using a Digital Receiver.” Science Advances, vol. 6, no. 19, eabb0451, AAAS, 2020, doi:10.1126/sciadv.abb0451.
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