Physics – Quantum Physics
Scientific paper
2001-03-06
Phsy. Rev. A, 65:022104, 2002
Physics
Quantum Physics
10 pages, Revtex
Scientific paper
10.1103/PhysRevA.65.022104
In our model a fixed Hamiltonian acts on the joint Hilbert space of a quantum system and its controller. We show under which conditions measurements, state preparations, and unitary implementations on the system can be performed by quantum operations on the controller only. It turns out that a measurement of the observable A and an implementation of the one-parameter group exp(iAr) can be performed by almost the same sequence of control operations. Furthermore measurement procedures for A+B, for (AB+BA), and for i[A,B] can be constructed from measurements of A and B. This shows that the algebraic structure of the set of observables can be explained by the Lie group structure of the unitary evolutions on the joint Hilbert space of the measuring device and the measured system. A spin chain model with nearest neighborhood coupling shows that the border line between controller and system can be shifted consistently.
Armknecht Frederik
Beth Thomas
Janzing Dominik
Zeier Robert
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