Skip to main content

Research Repository

Advanced Search

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

Silva, Isabela A.; Souza, Alexandre M.; Bromley, Thomas R.; Cianciaruso, Marco; Marx, Raimund; Sarthour, Roberto S.; Oliveira, Ivan S.; Lo Franco, Rosario; Glaser, Steffen J.; deAzevedo, Eduardo R.; Soares-Pinto, Diogo O.; Adesso, Gerardo


Isabela A. Silva

Alexandre M. Souza

Thomas R. Bromley

Marco Cianciaruso

Raimund Marx

Roberto S. Sarthour

Ivan S. Oliveira

Rosario Lo Franco

Steffen J. Glaser

Eduardo R. deAzevedo

Diogo O. Soares-Pinto


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.


Silva, I. A., Souza, A. M., Bromley, T. R., Cianciaruso, M., Marx, R., Sarthour, R. S., …Adesso, G. (2016). Observation of time-invariant coherence in a nuclear magnetic resonance quantum simulator. Physical Review Letters, 117(16),

Journal Article Type Article
Acceptance Date Sep 19, 2016
Publication Date Oct 14, 2016
Deposit Date Feb 24, 2017
Publicly Available Date Feb 24, 2017
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 117
Issue 16
Public URL
Publisher URL


You might also like

Downloadable Citations