Direct Characterization of Quantum Dynamics

Details Direct Characterization of Quantum Dynamics Direct Characterization of Quantum Dynamics

2006-01-05

arxiv.org/abs/quant-ph/0601033v2

Phys. Rev. Lett. 97, 170501 (2006)

Physics

Quantum Physics

4 pages, 2 figures, published version

Scientific paper

10.1103/PhysRevLett.97.170501

The characterization of quantum dynamics is a fundamental and central task in quantum mechanics. This task is typically addressed by quantum process tomography (QPT). Here we present an alternative "direct characterization of quantum dynamics" (DCQD) algorithm. In contrast to all known QPT methods, this algorithm relies on error-detection techniques and does not require any quantum state tomography. We illustrate that, by construction, the DCQD algorithm can be applied to the task of obtaining partial information about quantum dynamics. Furthermore, we argue that the DCQD algorithm is experimentally implementable in a variety of prominent quantum information processing systems, and show how it can be realized in photonic systems with present day technology.

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