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Originally devised as an extension of von Neumann measurement Hamiltonian to joint measurement of conjugate variables, the Arthurs-Kelly Hamiltonian has been found to have many other practical applications. I summarize in particular, experimental bounds on von Neumann entropy, noiseless quantum tracking of conjugate observables, remote tomography, entanlement swapping and exact measurement of correlation between conjugate observables.

Keywords

Conjugate Variables, Joint Measurements, Quantum Tracking, Remote Tomography, Teleportation.
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