A comparison between quantum and classical noise radar sources

Jonsson, Robert; Candia, Roberto Di; Ankel, Martin; Ström, Anders; Johansson, Göran

doi:10.1109/radarconf2043947.2020.9266597

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…For a coherent state input, i.e., for ξ = 0, we get that I norm,coh η = 4N S 1+2N B , meaning that an infinitesimal amount of squeezing allows us to reduce the QFI as in Eq. (42). Comparing this result with Eq.…”

Section: Erasing the Shadow-effectmentioning

confidence: 57%

Gaussian quantum estimation of the lossy parameter in a thermal environment

Jonsson,

Di Candia

2022

Preprint

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Lossy bosonic channels play an important role in a number of quantum information tasks, since they well approximate thermal dissipation in an experiment. Here, we characterize their metrological power in the idler-free and entanglement-assisted cases, using respectively single-and two-mode Gaussian states as probes. In the problem of estimating the lossy parameter, we study the energyconstrained quantum Fisher information (QFI) for generic temperature and lossy parameter regimes, showing qualitative behaviours of the optimal probes. We show semi-analytically that the two-mode squeezed-vacuum state optimizes the QFI for any value of the lossy parameter and temperature. We discuss the optimization of the total QFI, where the number of probes is allowed to vary by keeping the total energy-constrained. In this context, we elucidate the role of the "shadow-effect" for reaching a quantum advantage. We also consider a photon-number normalization for the environment, widely used in the analysis of quantum illumination and quantum reading protocols. With this normalization, we prove that the large bandwidth TMSV state is the optimal probe for any parameter value. Here, the quantum advantage is of at most a factor of 2, and is reached in the bright environment case for any lossy parameter values. Finally, we discuss the implications of our results for quantum illumination and quantum reading applications.

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Section: Erasing the Shadow-effectmentioning

confidence: 57%

Gaussian quantum estimation of the lossy parameter in a thermal environment

Jonsson,

Di Candia

2022

Preprint

Self Cite

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“…In the problem of target detection, a priori probabilities are not known; hence, we need to employ the Neyman–Pearson criterion [ 27 , 30 ], in which we set the false alarm probability to the maximum tolerable value and maximize the detection probability of the target. Readers interested in getting more details on the Neyman–Pearson criterion in the context of quantum illumination are referred to [ 31 , 32 , 33 ].…”

Section: Proposed Entanglement-assisted Multistatic Radar Techniquementioning

confidence: 99%

On Entanglement-Assisted Multistatic Radar Techniques

Djordjević

2022

Entropy

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Entanglement-based quantum sensors have much better sensitivity than corresponding classical sensors in a noisy and lossy regime. In our recent paper, we showed that the entanglement-assisted (EA) joint monostatic–bistatic quantum radar performs much better than conventional radars. Here, we propose an entanglement-assisted (EA) multistatic radar that significantly outperforms EA bistatic, coherent state-based quantum, and classical radars. The proposed EA multistatic radar employs multiple entangled transmitters performing transmit-side optical phase conjugation, multiple coherent detection-based receivers serving as EA detectors, and a joint detector.

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“…[19,20] Meanwhile, to reach better performance, various quantum resources such as entanglement [21] and squeezing [22] were applied to quantum computation, [23,24] quantum cryptography, [25] quantum simulation, [26,27] quantum teleportation, [28] quantum metrology, [29,30] etc. Most of the investigations in the field of quantum measurement tend to improve the resolution and signal-to-noise ratio (SNR) of the receiver, [31][32][33] which exactly manifests the particular advantages for quantum resources over conventional measurement. Actually, increasing either the number of photons in pulses or the detection times in ranging events helps improve the precision of positioning procedures, and so does it in entangled and squeezed pulses.…”

Section: Introductionmentioning

confidence: 99%

One-shot detection limits of time-alignment two-photon illumination radar

Gao

Zhang

et al. 2023

Chinese Phys. B

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Quantum radar has recently gained increasing importance in a number of military applications. The estimation accuracy of one-shot quantum illumination events is significant in target detection. However, the accuracy is inevitably deteriorated by measurement noises. The traditional one-shot illumination emits a single photon towards a certain area where thermal noise exists in the path and the states of the received photons are hard to distinguish in the following processing. Therefore, a new optical probe source is proposed in this work. The independent detecting unit in the enhanced illumination is comprised of a two-photon aligned in time by means of Hong-Ou-Mandel (HOM) interferometer. One step further, one-shot detection ability in a general discrete model is realized and it proves a significant promotion in accuracy. The expansion of useful parts in parameter space and the lower minimal error probability for hypothesis testing have been mathematically demonstrated. The accuracy of one-shot detection can be effectively improved by the proposed scheme which infers a great application potential in quantum illumination and imaging.

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A comparison between quantum and classical noise radar sources

Cited by 15 publications

References 23 publications

Gaussian quantum estimation of the lossy parameter in a thermal environment

Gaussian quantum estimation of the lossy parameter in a thermal environment

On Entanglement-Assisted Multistatic Radar Techniques

One-shot detection limits of time-alignment two-photon illumination radar

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