Experimental recovery of quantum correlations in absence of system-environment back-action

Jin-Shi Xu, Kai Sun, Chuan-Feng Li (), Xiao-Ye Xu, Guang-Can Guo, Erika Andersson, Rosario Lo Franco () and Giuseppe Compagno
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Jin-Shi Xu: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Kai Sun: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Chuan-Feng Li: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Xiao-Ye Xu: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Guang-Can Guo: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Erika Andersson: SUPA, Heriot-Watt University
Rosario Lo Franco: Università di Palermo
Giuseppe Compagno: Università di Palermo

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Revivals of quantum correlations in composite open quantum systems are a useful dynamical feature against detrimental effects of the environment. Their occurrence is attributed to flows of quantum information back and forth from systems to quantum environments. However, revivals also show up in models where the environment is classical, thus unable to store quantum correlations, and forbids system-environment back-action. This phenomenon opens basic issues about its interpretation involving the role of classical environments, memory effects, collective effects and system-environment correlations. Moreover, an experimental realization of back-action-free quantum revivals has applicative relevance as it leads to recover quantum resources without resorting to more demanding structured environments and correction procedures. Here we introduce a simple two-qubit model suitable to address these issues. We then report an all-optical experiment which simulates the model and permits us to recover and control, against decoherence, quantum correlations without back-action. We finally give an interpretation of the phenomenon by establishing the roles of the involved parties.

Date: 2013
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DOI: 10.1038/ncomms3851

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