Quantum System Identification

Details Quantum System Identification Quantum System Identification

2011-04-04

arxiv.org/abs/1104.0583v1

Phys. Rev. Lett. 108, 080502 (2012)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.108.080502

The aim of quantum system identification is to estimate the ingredients inside a black box, in which some quantum-mechanical unitary process takes place, by just looking at its input-output behavior. Here we establish a basic and general framework for quantum system identification, that allows us to classify how much knowledge about the quantum system is attainable, in principle, from a given experimental setup. Prior knowledge on some elements of the black box helps the system identification. We present an example in which a Bell measurement is more efficient to identify the system. When the topology of the system is known, the framework enables us to establish a general criterion for the estimability of the coupling constants in its Hamiltonian.

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