https://doi.org/10.1140/epjd/e2010-00258-5
Implementing multi-qubit entanglement of two-level systems inside a superconducting phase qubit
1
Laboratory of Quantum Information Technology, ICMP and
SPTE, South China Normal University, Guangzhou, P.R. China
2
Department of Physics and Electronic Engineering, Hefei
Normal University, Hefei, P.R. China
3
Department of Physics and Center of Theoretical and Computational
Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
4
National Laboratory of Solid State Microstructures and
Department of Physics, Nanjing University, Nanjing, P.R. China
Corresponding author: a longbaoyu@yahoo.com.cn
Received:
12
May
2010
Revised:
22
August
2010
Published online:
8
October
2010
The interaction between a superconducting phase qubit and the two-level systems located inside the Josephson tunnel barrier is described by the XY model, which is naturally used to implement the i-SWAP gate. With this gate, we propose a scheme to efficiently generate multi-qubit entangled states of such two-level systems, including multipartite W state and cluster states. In particular, it is found that, with the help of the phase qubit, the entanglement witness can be used to efficiently detect the produced multi-qubit entangled states.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010