On the quantumness of correlations in nuclear magnetic resonance
arXiv:1202.1795 · doi:10.1098/rsta.2011.0364
Abstract
Nuclear Magnetic Resonance (NMR) was successfully employed to test several protocols and ideas in Quantum Information Science. In most of these implementations the existence of entanglement was ruled out. This fact introduced concerns and questions about the quantum nature of such bench tests. In this article we address some issues related to the non-classical aspects of NMR systems. We discuss some experiments where the quantum aspects of this system are supported by quantum correlations of separable states. Such quantumness, beyond the entanglement-separability paradigm, is revealed via a departure between the quantum and the classical versions of information theory. In this scenario, the concept of quantum discord seems to play an important role. We also present an experimental implementation of an analogous of the single-photon Mach-Zehnder interferometer employing two nuclear spins to encode the interferometric paths. This experiment illustrate how non-classical correlations of separable states may be used to simulate quantum dynamics. The results obtained are completely equivalent to the optical scenario, where entanglement (between two field modes) may be present.
References in corpus (32)
- Introducing Quantum Discord
- Classical, quantum and total correlations
- Quantum discord and the power of one qubit
- NMR Techniques for Quantum Control and Computation
- Experimental quantum computing without entanglement
- Separability of very noisy mixed states and implications for NMR quantum computing
- Classical and quantum correlations under decoherence
- Comparing, Optimising and Benchmarking Quantum Control Algorithms in a Unifying Programming Framework
- Quantum Computing with NMR
- Environment-induced sudden transition in quantum discord dynamics
- Observable measure of bipartite quantum correlations
- Theoretical and experimental aspects of quantum discord and related measures
- Experimental detection of non-classical correlations in mixed state quantum computation
- Experimentally Witnessing the Quantumness of Correlations
- NMR quantum simulation of localization effects induced by decoherence
- Nonclassical correlation in NMR quadrupolar systems
- Experimental analysis of the quantum complementarity principle
- A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states
- Simulation of chemical reaction dynamics on an NMR quantum computer
- The elusive source of quantum effectiveness
- Criteria for measures of quantum correlations
- Quantification of complementarity in multi-qubit systems
- Entanglement is not a critical resource for quantum metrology
- Single-experiment-detectable nonclassical correlation witness
- Detecting the quantum discord of an unknown state by a single observable
- NMR Analog of Bell's Inequalities Violation Test
- An interferometric complementarity experiment in a bulk Nuclear Magnetic Resonance ensemble
- Equivalence between Redfield and master equation approaches for a time-dependent quantum system and coherence control
- Strong entanglement causes low gate fidelity in inaccurate one-way quantum computation
- Thermal Equilibrium as an Initial State for Quantum Computation by NMR
- Classicality witness for two-qubit states
- Witnessing the quantum discord of all the unknown states
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- Quantum discord and its allies: a review
- Measuring bipartite quantum correlations of an unknown state
- Witness of mixed separable states useful for entanglement creation
- Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling
- Quantum discord in nuclear magnetic resonance systems at room temperature
- Witnessing nonclassical correlations via a single-shot experiment on an ensemble of spins using NMR
- Broadcasting of quantum correlations in qubit-qudit systems
- Classification and measurement of multipartite entanglement by reconstruction of correlation tensors on an NMR quantum processor
- The sudden change phenomenon of quantum discord
- Computing coherence vectors and correlation matrices, with application to quantum discord quantification
- Information under Lorentz transformation
- Computing partial transposes and related entanglement functions