Quantum Process Tomography: Resource Analysis of Different Strategies

TLDR: In this paper, the authors present a comparison of different quantum-process tomography schemes with respect to some of the physical resources they require and conclude that for quantum systems with controllable two-body interactions, the DCQD scheme is more efficient than other known quantum process tomography techniques in terms of the total number of required elementary quantum operations.

Abstract: Characterization of quantum dynamics is a fundamental problem in quantum physics and quantum-information science. Several methods are known which achieve this goal, namely standard quantum-process tomography (SQPT), ancilla-assisted process tomography, and the recently proposed scheme of direct characterization of quantum dynamics (DCQD). Here, we review these schemes and analyze them with respect to some of the physical resources they require. Although a reliable figure-of-merit for process characterization is not yet available, our analysis can provide a benchmark which is necessary for choosing the scheme that is the most appropriate in a given situation, with given resources. As a result, we conclude that for quantum systems where two-body interactions are not naturally available, SQPT is the most efficient scheme. However, for quantum systems with controllable two-body interactions, the DCQD scheme is more efficient than other known quantum-process tomography schemes in terms of the total number of required elementary quantum operations.