Quantum correlations of identical particles subject to classical environmental noise

• Published in: Quantum information processing Vol. 15; no. 9; pp. 3711 - 3743
• Main Authors: Beggi, Andrea, Buscemi, Fabrizio, Bordone, Paolo
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2016; Springer Nature B.V
• Subjects: Background noise; Bosons; Correlation; Data Structures and Information Theory; Fermions; Mathematical Physics; Noise; Physics; Physics and Astronomy; Quantum Computing; Quantum entanglement; Quantum Information Technology; Quantum Physics; Quantum theory; Random walk; Spintronics; noise; 1; Quantum discord; Indistinguishable particles; Entanglement; RTN
• ISSN: 1570-0755; 1573-1332
• DOI: 10.1007/s11128-016-1334-8

In this work, we propose a measure for the quantum discord of indistinguishable particles, based on the definition of entanglement of particles given in Wiseman and Vaccaro (Phys Rev Lett 91:097902, 2003 . doi: 10.1103/PhysRevLett.91.097902 ). This discord of particles is then used to evaluate the quantum correlations in a system of two identical bosons (fermions), where the particles perform a quantum random walk described by the Hubbard Hamiltonian in a 1D lattice. The dynamics of the particles is either unperturbed or subject to a classical environmental noise—such as random telegraph, pink or brown noise. The observed results are consistent with those for the entanglement of particles , and we observe that on-site interaction between particles have an important protective effect on correlations against the decoherence of the system.