Eur. Phys. J. D 57, 141-144 (2010)
https://doi.org/10.1140/epjd/e2010-00015-x

Macroscopic Greenberg-Horne-Zeilinger state and W state in charge qubits based on Coulomb blockade

¹ Department of Physics, National University of Defense Technology, Changsha, 410073, P.R. China
² Department of Physics, Tsinghua University, 100084, Beijing, P.R. China
³ Tsinghua National Laboratory for Information Science and Technology, 100084, Beijing, P.R. China

Corresponding author: nmliang@nudt.edu.cn

Received: 11 October 2009
Published online: 26 January 2010

Abstract

Based on Coulomb blockade, we propose a scheme to generate two types of three-qubit entanglement, known as Greenberg-Horne-Zeilinger (GHZ) state and W state, in a macroscopic quantum system. The qubit is encoded in the charge qubit in the superconducting system, and the scheme can be generalized to generate the GHZ state and W state in multi-partite charge qubits. The GHZ state and W state are the eigenstates of the respective idle Hamiltonian, so they have the long lifetime.