Local measurement for a set of n -qubit maximally entangled states in cavity QED
Chui‐Ping Yang, Siyuan Han · Physical Review A · 2007
An approach for performing a local measurement on a set of complete $n$-qubit maximally entangled states via cavity QED is presented. The method operates essentially by creating a single photon in the cavity through one qubit and then performing a joint multiqubit phase shift on the remaining qubits with the assistance of the photon. It is shown that for three-level qubit systems, a complete set of ${2}^{n}$ $n$-qubit maximally entangled states can be measured simultaneously, deterministic and independent of the number of qubits. Hence, the method is very efficient for realizing multiqubit GHZ-state measurement which is important to quantum information processing and communication.