Dissipation, dephasing and quantum Darwinism in qubit systems with random unitary interactions
Institut fúr Angewandte Physik, Technische
Universitát Darmstadt, 64289
Received in final form: 26 May 2016
Published online: 1 September 2016
We investigate the influence of dissipation and decoherence on quantum Darwinism by generalizing Zurek’s original qubit model of decoherence and the establishment of pointer states [W.H. Zurek, Nat. Phys. 5, 181 (2009); see also arXiv: quant-ph/0707.2832v1, pp. 14-19.]. Our model allows for repeated multiple qubit-qubit couplings between system and environment which are described by randomly applied two-qubit quantum operations inducing entanglement, dissipation and dephasing. The resulting stationary qubit states of system and environment are investigated. They exhibit the intricate influence of entanglement generation, dissipation and dephasing on this characteristic quantum phenomenon.
Key words: Quantum Information
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2016