Microwave quantum illumination using a digital receiver.
TLDR
This work generates entangled fields to illuminate a room-temperature object at a distance of 1 m in a free-space detection setup and implements 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.Abstract:
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.read more
Citations
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Circuit quantum electrodynamics
TL;DR: The field of circuit quantum electrodynamics (QED) as discussed by the authors was initiated by Josephson-junction-based superconducting circuits and has become an independent and thriving field of research in its own right.
Posted Content
Quantum State Tomography with Conditional Generative Adversarial Networks
TL;DR: This work applies conditional generative adversarial networks (CGANs) to QST and demonstrates that the QST-CGAN reconstructs optical quantum states with high fidelity, using orders of magnitude fewer iterative steps, and less data, than both accelerated projected-gradient-based and iterative maximum-likelihood estimation.
Journal ArticleDOI
Distributed quantum sensing
Zheshen Zhang,Quntao Zhuang +1 more
TL;DR: This review formulates distributed quantum sensing (DQS) from a quantum-information perspective and describes DQS protocols and their experimental demonstrations.
Journal ArticleDOI
Quantum State Tomography with Conditional Generative Adversarial Networks.
TL;DR: In this paper, conditional generative adversarial networks (CGANs) are applied to quantum state tomography (QST) in intermediate-scale quantum devices, and two dueling neural networks, a generator and a discriminator, learn multimodal models from data.
Journal ArticleDOI
Heterodyne sensing of microwaves with a quantum sensor.
Jonas Meinel,Jonas Meinel,Vadim V. Vorobyov,B. V. Yavkin,Durga Dasari,Durga Dasari,Hitoshi Sumiya,Shinobu Onoda,Junichi Isoya,Jörg Wrachtrup,Jörg Wrachtrup +10 more
TL;DR: In this article, the authors demonstrate a heterodyne detection method for microwaves (MW) leading to a lifetime independent spectral resolution in the GHz range, where they reference the MW signal to a local oscillator by generating the initial superposition state from a coherent source.
References
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