Measures and applications of quantum correlations
By Gerardo Adesso, Thomas R. Bromley, M. Cianciaruso. 2016
391 citations recorded by the source corpus.
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 (QCs) in composite states. We focus on various approaches to define and quantify general QCs, 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.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/cf8ad0d0fadfc4dbc68f030bec2ebfc6ba3b5705
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Colloquium: quantum coherence as a resource (2016, background): “A general framework to define quantifiers of discord and quantumness in a bipartite system from corresponding quantifiers of quantum coherence, by minimizing the latter over all local bases for one or both subsystems respectively, has been formalized recently in (Adesso et al., 2016).”
- Quantum-enhanced measurements without entanglement (2017, background): “…nonzero discord (from the point of view of A) if and only if it is altered by all possible local measurements performed on subsystem A: disturbance by measurement is a genuine quantum feature which is captured by the concept of discord, see (Adesso et al., 2016; Modi et al., 2012) for more details.”
- Quantum coherence and geometric quantum discord (2017, background): “Within this framework, an abundance of discordlike quantum correlation measures were proposed and studied from different aspects in the past years (Adesso et al., 2016; Modi et al., 2012).”