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Title: Ansatz for the quantum phase transition in a dissipative two-qubit system
Authors: Zheng, Hang
Lü, Zhiguo
Zhao, Yang
Keywords: Quantum computing
Issue Date: 2015
Source: Zheng, H., Lü, Z., & Zhao, Y. (2015). Ansatz for the quantum phase transition in a dissipative two-qubit system. Physical Review E, 91, 062115-.
Series/Report no.: Physical Review E
Abstract: By means of a unitary transformation, we propose an ansatz to study quantum phase transitions in the ground state of a two-qubit system interacting with a dissipative reservoir. First, the ground-state phase diagram is analyzed in the presence of the Ohmic and sub-Ohmic bath using an analytic ground-state wave function that takes into account the competition between intrasite tunneling and intersite correlation. The quantum critical point is determined as the transition point from a nondegenerate to a degenerate ground state, and our calculated critical coupling strength αc agrees with that from the numerical renormalization-group method. Moreover, by computing the entanglement entropy between the qubits and the bath as well as the qubit-qubit correlation function in the ground state, we explore the nature of the quantum phase transition between the delocalized and localized states.
ISSN: 1539-3755
DOI: 10.1103/PhysRevE.91.062115
Schools: School of Materials Science & Engineering 
Rights: © 2015 American Physical Society. This paper was published in Physical Review E and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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