Device-independent quantum reading and noise-assisted quantum transmitters
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TLDR
In this article, the authors show that the enhanced quantum efficiency depends on the presence in the transmitter of a particular type of quantum correlations, the discord of response, which leads to an increased state distinguishability.Abstract:
In quantum reading, a quantum state of light (transmitter) is applied to read classical information. In the presence of noise or for sufficiently weak signals, quantum reading can outperform classical reading by enhanced state distinguishability. Here we show that the enhanced quantum efficiency depends on the presence in the transmitter of a particular type of quantum correlations, the discord of response. Different encodings and transmitters give rise to different levels of efficiency. Considering noisy quantum probes we show that squeezed thermal transmitters with non-symmetrically distributed noise among the field modes yield a higher quantum efficiency compared to coherent thermal quantum states. The noise-enhanced quantum advantage is a consequence of the discord of response being a non-decreasing function of increasing thermal noise under constant squeezing, a behavior that leads to an increased state distinguishability. We finally show that, for non-symmetric squeezed thermal states, the probability of error, as measured by the quantum Chernoff bound, vanishes asymptotically with increasing local thermal noise at finite global squeezing. Therefore, at fixed finite squeezing, noisy but strongly discordant quantum states with large noise imbalance between the field modes can outperform noisy classical resources as well as pure entangled transmitters with the same finite level of squeezing.read more
Citations
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Quantum-enhanced measurements without entanglement
Daniel Braun,Gerardo Adesso,Fabio Benatti,Roberto Floreanini,Ugo Marzolino,Morgan W. Mitchell,Stefano Pirandola +6 more
TL;DR: In this article, a review of quantum-enhanced measurements can be found, including the use of more general quantum correlations such as quantum discord, identical particles, or non-trivial hamiltonians, and the estimation of thermodynamical parameters or parameters characterizing non-equilibrium states.
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Advances in photonic quantum sensing
Stefano Pirandola,Stefano Pirandola,Bhaskar Roy Bardhan,Tobias Gehring,Christian Weedbrook,Seth Lloyd +5 more
TL;DR: The theoretical and experimental developments of quantum reading of classical data, quantum illumination of targets, and optical resolution beyond the Rayleigh limit are described.
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Measures and applications of quantum correlations
TL;DR: This work gives an overview of the current quest for a proper understanding and characterisation of the frontier between classical and quantum correlations (QCs) in composite states, and focuses on various approaches to define and quantify general QCs, based on different yet interlinked physical perspectives.
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Geometric measures of quantum correlations : characterization, quantification, and comparison by distances and operations
TL;DR: In this article, the authors compare three geometric measures of bipartite quantum correlations: geometric discord, measurement-induced geometric discord and the discord of response, each one defined according to three contractive distances on the set of quantum states, namely the trace, Bures, and Hellinger distances.
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Discord of response
TL;DR: In this paper, the Bures distance is defined as the minimum distance from the set of unitarily perturbed states in a quantum state to a set of local unitary operations, which is a measure of quantum correlations.
References
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