Direct measurement of concurrence for atomic two-qubit pure states

Details Direct measurement of concurrence for atomic two-qubit pure states Direct measurement of concurrence for atomic two-qubit pure states

2006-11-01

arxiv.org/abs/quant-ph/0611016v1

Phys. Rev. A 75, 032303 (2007).

Physics

Quantum Physics

4 pages and 3 figures, submitted for publication

Scientific paper

We propose a general scheme to measure the concurrence of an arbitrary two-qubit pure state in atomic systems. The protocol is based on one- and two-qubit operations acting on two available copies of the bipartite system, and followed by a global qubit readout. We show that it is possible to encode the concurrence in the probability of finding all atomic qubits in the ground state. Two possible scenarios are considered: atoms crossing 3D microwave cavities and trapped ion systems.

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