How discord underlies the noise resilience of quantum illumination

Weedbrook, Christian; Pirandola, Stefano; Thompson, Jayne; Vedral, Vlatko; Gu, Mile

doi:10.1088/1367-2630/18/4/043027

Cited by 90 publications

(89 citation statements)

References 39 publications

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“…In [271], the accuracy of the discrimination between two states ρ 0 and ρ 1 with a priori probabilities p 0 and p 1 , respectively, has been quantified by the corresponding Shannon distinguishability, i.e., D H (ρ 0 , ρ 1 ) := max M J(X : X In a quantum illumination protocol assisted by non-classical correlations, the sender improves their strategy by maximally entangling the probe A with an idler ancilla B (which is retained at the sending station) by creating the pure global state ρ ψ AB = |ψ ψ| AB , where…”

Section: State Discrimination and Quantum Illuminationmentioning

confidence: 99%

“…In [271] an answer has been provided by showing a direct equality between the performance gain in quantum illumination over any conventional illumination protocol and the amount of quantum discord between the probe and its ancilla which is consumed to detect the target, thus linking the expenditure of QCs to the resilient enhancement of quantum illumination. More precisely:…”

Section: State Discrimination and Quantum Illuminationmentioning

confidence: 99%

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Measures and applications of quantum correlations

Adesso¹,

Bromley²,

Cianciaruso³

2016

J. Phys. A: Math. Theor.

395

416

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Abstract. Quantum information theory is built upon the realisation that quantum resources like coherence and entanglement can be exploited for novel or enhanced ways of transmitting and manipulating information, such as quantum cryptography, teleportation, and quantum computing. We now know that there is potentially much more than entanglement behind the power of quantum information processing. There exist more general forms of non-classical correlations, stemming from fundamental principles such as the necessary disturbance induced by a local measurement, or the persistence of quantum coherence in all possible local bases. These signatures can be identified and are resilient in almost all quantum states, and have been linked to the enhanced performance of certain quantum protocols over classical ones in noisy conditions. Their presence represents, among other things, one of the most essential manifestations of quantumness in cooperative systems, from the subatomic to the macroscopic domain. In this work we give an overview of the current quest for a proper understanding and characterisation of the frontier between classical and quantum correlations in composite states. We focus on various approaches to define and quantify general quantum correlations, based on different yet interlinked physical perspectives, and comment on the operational significance of the ensuing measures for quantum technology tasks such as information encoding, distribution, discrimination and metrology. We then provide a broader outlook of a few applications in which quantumness beyond entanglement looks fit to play a key role.

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Section: State Discrimination and Quantum Illuminationmentioning

confidence: 99%

Section: State Discrimination and Quantum Illuminationmentioning

confidence: 99%

Measures and applications of quantum correlations

Adesso¹,

Bromley²,

Cianciaruso³

2016

J. Phys. A: Math. Theor.

395

416

View full text Add to dashboard Cite

show abstract

“…Although the thermal noise destroys the entanglement, theory showed that the QI system will significantly outperform a classical (coherent-state) system of the same transmitted energy [5][6][7]. Later, a QI protocol was proposed for secure communication [8] whose experimental realization [9] showed that entanglement's benefit could, indeed, survive an entanglement-breaking channel.…”

mentioning

confidence: 99%

Microwave Quantum Illumination

et al. 2015

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Quantum illumination is a quantum-optical sensing technique in which an entangled source is exploited to improve the detection of a low-reflectivity object that is immersed in a bright thermal background. Here, we describe and analyze a system for applying this technique at microwave frequencies, a more appropriate spectral region for target detection than the optical, due to the naturally occurring bright thermal background in the microwave regime. We use an electro-optomechanical converter to entangle microwave signal and optical idler fields, with the former being sent to probe the target region and the latter being retained at the source. The microwave radiation collected from the target region is then phase conjugated and upconverted into an optical field that is combined with the retained idler in a joint-detection quantum measurement. 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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“…Achieving this in a cheap and reliable way is essential to the development of future quantum technologies. They also reinforces the role of quantum discord as a beneficial and practically relevant quantity [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]: as discord appears to bound the entanglement gain and to allow for excessive entanglement distribution, it emerges as a key player of fundamental relevance in the context of quantum communication and networking.…”

Section: Discussionmentioning

confidence: 54%

Excessive distribution of quantum entanglement

et al. 2016

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We classify protocols of entanglement distribution as excessive and non-excessive ones. In a non-excessive protocol, the gain of entanglement is bounded by the amount of entanglement being communicated between the remote parties, while excessive protocols violate such bound. We first present examples of excessive protocols that achieve a significant entanglement gain. Next we consider their use in noisy scenarios, showing that they improve entanglement achieved in other ways and for some situations excessive distribution is the only possibility of gaining entanglement.

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How discord underlies the noise resilience of quantum illumination

Cited by 90 publications

References 39 publications

Measures and applications of quantum correlations

Measures and applications of quantum correlations

Microwave Quantum Illumination

Excessive distribution of quantum entanglement

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