We introduce Wigner measures for infinite-dimensional open quantum systems; important examples of such systems are encountered in control theory. In addition, we propose an axiomatic definition coherent feedback.

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Many procedures exist for nding solutions to optimal control problems. Measures characterizing each method describe the method's performance as functions of quantities that the method utilizes. However, the measures are not usually consistent across solutions so as to allow unbiased comparison of diierent solutions to the same problem. This paper presents state entropy, control entropy, and ave...