Identifying non-k-separability of a class of N-qubit complete graph states using correlation tensors
Centre for Nonlinear Dynamics, School of Physics, Bharathidasan
Received: 29 January 2016
Received in final form: 20 May 2016
Published online: 5 July 2016
We derive a general expression for standard tensor norm of N-body correlation tensors for N-qubit complete graph states. With the help of this expression, we formulate a separability criterion that identifies non-k-separability of a class of N-qubit complete graph states, including GHZ state. We illustrate the performance of our criterion by considering the N-qubit complete graph states added with colored product noise. We also demonstrate that few local measurement settings are sufficient to evaluate our criterion.
Key words: Quantum Information
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2016