Observation of time-invariant coherence in a nuclear magnetic resonance quantum simulator

Silva, Isabela A. and Souza, Alexandre M. and Bromley, Thomas R. and Cianciaruso, Marco and Marx, Raimund and Sarthour, Roberto S. and Oliveira, Ivan S. and Lo Franco, Rosario and Glaser, Steffen J. and deAzevedo, Eduardo R. and Soares-Pinto, Diogo O. and Adesso, Gerardo (2016) Observation of time-invariant coherence in a nuclear magnetic resonance quantum simulator. Physical Review Letters, 117 (16). p. 160402. ISSN 1079-7114

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Abstract

The ability to live in coherent superpositions is a signature trait of quantum systems and constitutes an irreplaceable resource for quantum-enhanced technologies. However, decoherence effects usually destroy quantum superpositions. It has been recently predicted that, in a composite quantum system exposed to dephasing noise, quantum coherence in a transversal reference basis can stay protected for indefinite time. This can occur for a class of quantum states independently of the measure used to quantify coherence, and requires no control on the system during the dynamics. Here, such an invariant coherence phenomenon is observed experimentally in two different setups based on nuclear magnetic resonance at room temperature, realising an effective quantum simulator of two- and four-qubit spin systems. Our study further reveals a novel interplay between coherence and various forms of correlations, and highlights the natural resilience of quantum effects in complex systems.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
Identification Number: 10.1103/PhysRevLett.117.160402
Depositing User: Adesso, Gerardo
Date Deposited: 24 Feb 2017 10:23
Last Modified: 13 Oct 2017 01:42
URI: http://eprints.nottingham.ac.uk/id/eprint/40785

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