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

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.

Citation

Silva, I. A., Souza, A. M., Bromley, T. R., Cianciaruso, M., Marx, R., Sarthour, R. S., Oliveira, I. S., Lo Franco, R., Glaser, S. J., deAzevedo, E. R., Soares-Pinto, D. O., & Adesso, G. (2016). Observation of time-invariant coherence in a nuclear magnetic resonance quantum simulator. Physical Review Letters, 117(16), https://doi.org/10.1103/PhysRevLett.117.160402

• 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
• DOI: https://doi.org/10.1103/PhysRevLett.117.160402
• Public URL: https://nottingham-repository.worktribe.com/output/823530
• Publisher URL: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.160402
• Contract Date: Feb 24, 2017