Quantum-enhanced noise radar
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TLDR
In this article, a two-mode squeezed state, which exhibits continuous-variable entanglement between so-called signal and idler beams, is used as input to the radar system.Abstract:
We propose a protocol for quantum illumination: a quantum-enhanced noise radar. A two-mode squeezed state, which exhibits continuous-variable entanglement between so-called signal and idler beams, is used as input to the radar system. Compared to existing proposals for quantum illumination, our protocol does not require joint measurement of the signal and idler beams. This greatly enhances the practicality of the system by, for instance, eliminating the need for a quantum memory to store the idler. We perform a proof-of-principle experiment in the microwave regime, directly comparing the performance of a two-mode squeezed source to an ideal classical noise source that saturates the classical bound for correlation. We find that, even in the presence of significant added noise and loss, the quantum source outperforms the classical source by as much as an order of magnitude.read more
Citations
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Circuit quantum electrodynamics
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Microwave quantum illumination using a digital receiver
TL;DR: In this article, a digital phase conjugate receiver based on linear quadrature measurements was proposed to detect room-temperature objects at a distance of 1 meter in a free-space detection setup.
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Microwave quantum illumination using a digital receiver.
TL;DR: 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.
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Imaging through noise with quantum illumination
TL;DR: This work demonstrates the first full-field imaging system using quantum illumination by an enhanced detection protocol, and achieves a rejection of background and stray light of up to 5.8 and an image contrast improvement up to a factor of 11, which is resilient to both environmental noise and transmission losses.
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Multidimensional quantum-enhanced target detection via spectrotemporal-correlation measurements
Yingwen Zhang,Duncan G. England,Andrei Nomerotski,Peter Svihra,Peter Svihra,Steven Ferrante,Paul Hockett,Benjamin J. Sussman,Benjamin J. Sussman +8 more
TL;DR: In this paper, the authors investigated quantum-enhanced target detection in the presence of large background noise using multidimensional quantum correlations between photon pairs generated through spontaneous parametric down-conversion.
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TL;DR: By making the optimum joint measurement on the light received from the target region together with the retained spontaneous parametric down-conversion idler beam, the quantum-illumination system realizes a 6 dB advantage in the error-probability exponent over the optimum reception coherent-state system.
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TL;DR: It is shown that all conceivable variance matrices can be generated through squeezed thermal states of the n-mode system and their symplectic transforms and developed in both the real and the complex forms for varianceMatrices.
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Flux-driven Josephson parametric amplifier
Tsuyoshi Yamamoto,Kunihiro Inomata,Michio Watanabe,Kazuaki Matsuba,Toshiyuki Miyazaki,William D. Oliver,Yasunobu Nakamura,Jaw-Shen Tsai +7 more
TL;DR: In this paper, a Josephson parametric amplifier consisting of a superconducting coplanar-waveguide resonator terminated by a dc super-conducting quantum interference device (SQUID) is presented.
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Microwave Quantum Illumination
Shabir Barzanjeh,Saikat Guha,Christian Weedbrook,David Vitali,Jeffrey H. Shapiro,Stefano Pirandola +5 more
TL;DR: The error probability of this microwave quantum-illumination system, or quantum radar, is shown to be superior to that of any classical microwave radar of equal transmitted energy.
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Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator
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