Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.160402
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Funding
- European Research Council [637352 GQCOP]
- Brazilian funding agency FAPERJ
- Brazilian funding agency CNPq (PDE Grant) [236749/2012-9]
- CAPES (Pesquisador Visitante Especial Grant) [108/2012]
- Brazilian National Institute of Science and Technology of Quantum Information (INCT/IQ)
- German DFG [SPP 1601, Gl 203/7-2]
- Engineering and Physical Sciences Research Council [1365242] Funding Source: researchfish
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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.
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