Quantum Nondemolition Circuit for Testing Bipartite Complementarity
Fernando de Melo, Stephen Patrick Walborn, János A. Bergou, L. Davidovich · Physical Review Letters · 2007
We present a quantum circuit that implements a nondemolition measurement of complementary single- and bipartite properties of a two-qubit system: entanglement and single-partite visibility and predictability. The system must be in a pure state with real coefficients in the computational basis, which allows a direct operational interpretation of those properties. The circuit can be realized in many systems of interest to quantum information.