Quantum experiments are described in terms of time-dependent networks of quantum bits, each qubit representing
an elementary information gateway. The emphasis is on the signal properties of apparatus rather than on
systems under observation (SUOs), with the quantum states of the theory (the labstates) representing the observer's
information about the state of their apparatus, rather than of any SUO. The formalism gives an efficient
quantum register description related to the formalism of quantum computation. Experiments conventionally
described by the PVM and POVM formalisms are treated in identical terms, the formalism providing an efficient
modular approach to quantum optics experiments of arbitrary complexity.
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