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

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

Risultato della ricerca: Articlepeer review

74 Citazioni (Scopus)

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 was recently predicted that, in a composite quantum system exposed to dephasing noise, quantum coherence in a transversal reference basis can stay protected for an indefinite time. This can occur for a class of quantum states independently of the measure used to quantify coherence, and it 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, realizing 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 it highlights the natural resilience of quantum effects in complex systems.
Lingua originaleEnglish
pagine (da-a)160402-1-160402-6
Numero di pagine6
RivistaPhysical Review Letters
Volume117
Stato di pubblicazionePublished - 2016

All Science Journal Classification (ASJC) codes

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